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THURLBY THANDAR INSTRUMENTS
New PL & New PL-P Series
New PL Series - advanced linear regulated laboratory power supplies
true analog controls with digital functionality
New PL-P Series - full remote control for bench & system applications
analog, RS-232, USB, LAN (LXI) or GPIB interfaces
New PL series - advanced linear regulated laboratory power supplies
New PL Series
Analog control for a digital world
Building on the success of a winning formula
In the 1980s the original PL series transformed customer expectations of
the bench power supply and set a
format that has been extensively
copied by other manufacturers.
Over the years, the PL series
has been steadily revised and
extended. Hundreds of thousands
of PL series units are currently
in use across the world and it
remains the laboratory power
supply of choice for many
organisations.
TTi has been at the forefront of laboratory power supply design for
around thirty years during which it has re-defined the state-of-the-art for
switch mode products with its innovative Mixed-mode and PowerFlex
regulator designs.
Continuing development of linear models has generated the lower cost
EL series, and the advanced QL series. However, demand for the PL
series has remained strong - demonstrating how well it has met the
needs of its many customers.
Now TTi has engineered an all-new design which retains all the key
features of the original PL series, but combines them with new and
important features.
Analog controls with digital stability
As technology has changed, many products have moved from analog
controls to digital ones. Although digital controls suit many instruments,
they do not necessarily suit a bench power supply.
Customer research shows that many users prefer the speed and simplicity of conventional analog controls for setting voltage and current.
Digital controls may offer greater precision, but often at the expense of
ease-of-use.
With this in mind, the New PL series has retained the true analog controls of its predecessor.
Linear regulation for ultra-low noise
Linear regulation still offers the lowest output noise and the best transient
response (recovery time from a sudden current step).
Most linear regulated power supplies offer low output noise with figures
below 2mV rms being typical.
The New PL series goes a stage further and
an rms noise figure of 0.4mV with tightly
specified pk-pk noise and common-mode
current figures.
The main disadvantage of analog controls is stability and security. The
settings of analog potentiometers can drift over time. More importantly,
the settings can be changed accidentally with potentially serious consequences.
The New PL series introduces S-Lock. One press of the Lock button
transfers control of voltage and current from the analog controls to
internal digital circuitry.
This offers not just complete security, but exceptional stability as well
with each setting controlled by an instrumentation quality DAC.
Lock your settings
at the touch of
a button !
Choose a voltage range that suits your task
When working with any particular piece of equipment, engineers often require a voltage
source variable over only a narrow range. Set the voltage too high and damage might occur,
set it too low and the circuit may reset.
That’s where the V-Span function of the New PL series comes in. It allows the user to
redefine the end-stop values of the voltage control to define a specific voltage range.
For example:
An engineer is working on a circuit that will eventually
operate from four NiMh cells.
They use V-Span to set a Vmax of 5.8 volts (to prevent
over-voltage damage) and a Vmin of 3.6 volts (to ensure
that the circuit doesn’t reset).
They now have a power supply which provides high
resolution analog control over the exact voltage range they
need.
Vmin and Vmax can be set anywhere between zero and
maximum output voltage subject only to Vmax > (Vmin +
0.1V). The fine control gives additional adjustment of ±1%.
Once set, the voltage span function can be turned on or off at the press of a button*.
New PL series - ultra compact using minimum bench or rack space
Ultra-compact design with higher power efficiency and near-silent cooling
The New PL series achieves an exceptional power density for a linear
regulated power supply by offering up to 90 watts from a ¼ rack 3U
sized casing.
This gives it an unusually small bench footprint taking up less space
on a crowded bench.
For rack-mount application, up to four units can be mounted into a
single slot.
Despite its small size and linear regulation, the New PL series generates
relatively little heat through the use of an advanced phase controlled preregulator.
This gives it significantly higher energy efficiency than conventional linear
regulated designs, particularly when supplying lower voltages.
The internal heat-sinks use fan-assisted convection cooling in order to remove
the heat with minimal fan noise.
Actual size
High accuracy four digit
meters have a fixed resolution for consistent readings
at-a-glance.
Low current range gives
0.1mA meter resolution and
finer low current setting.
View and adjust setting
limits at any time.
S-Lock digitally locks voltage and current settings at
the touch of a button.
Meter averaging reduces the
jitter from rapidly varying
load currents.
True analog controls make
adjustment quick and simple.
V-Span enables the full
300o rotation of the voltage
control to cover any voltage range.
DC output switch enables
voltage and current to be
set up before connecting the
load.
Safety binding post terminals can accept fixed-shroud
4mm plugs** as well as
normal plugs, bare wires,
and fork connectors.
Better performance ....
Linear regulation:
ultra-low output noise and fast transient recovery
 High power density:
90 watts per output from an ultra-compact case size
 Higher precision:
exceptional line and load regulation;
easy-switch remote sense
 Better metering:
high accuracy four digit fixed-resolution meters;
low current range; current meter averaging

Voltage sensing can be
changed between local
and remote at the flick of a
switch.
.... with real ease of use
True analog controls:
quick and intuitive adjustment of voltage and current
 With digital convenience:
unique S-Lock and V-Span functions (see opposite)
 See exactly what’s happening:
dc output switch - check your settings before applying them;
‘view settings’ button - check and adjust limits at any time
 Safe and secure to use:
lockable voltage and current settings (using S-Lock);
connect via safety binding-post terminals

Dual Output model - PL303QMD (quad-mode dual)
Compact Dimensions
Four Modes of Operation
The PL303QMD is a dual output power supply with the same high
power density as the single output models - 180 watts from a half
rack 3U sized casing (214mm x 131mm).
The PL303QMD is more than just two PL303 single power supplies
in one box. It has four modes of operation: Independent, Isolated
Tracking, Isolated Ratio Tracking, and True Parallel.
90% of
actual size
Independent Mode: The two outputs are
completely independent and electrically isolated from each other.
Isolated Tracking Mode: The two outputs
remain electrically isolated, but the voltage
control of the Master output sets an identical
voltage on the Slave output.
Isolated Ratio Tracking Mode: As normal
tracking, but the Slave voltage can be set to
any percentage of the Master voltage and retains that ratio as the Master voltage is varied.
True Parallel Mode: All of the power is channelled to the Master output which can then
supply up to 6 amps.
Note: Isolated Tracking enables the user to create two rails
of either polarity and to reference them to different grounds
if necessary (e.g. digital ground and analog ground).
Note: In Parallel mode the Master side becomes a single
180 watt power supply, with the current meter operating
to 6 amps. The slave output is disabled and its displays are
turned off.
* Safety interlocks
A key requirement in a power supply is to prevent the wrong voltage
or current being accidentally applied to the circuit-under-test.
Consequently all operations that could result in an unexpected
change in voltage or current settings have intelligent interlocks to
prevent this.
** Safety terminals
The use of fixed-shroud 4mm plugs is becoming mandatory within an
increasing number of laboratories for safety reasons.
Standard binding post terminals can not accept these fixed-shroud
plugs.
Simultaneous Output Control
The Both On/Both Off buttons are in addition
to the individual switches for each output,
and allow both outputs to be turned on or off
synchronously by a single button press.
Synchronous switching of the outputs is of
increasing importance for circuitry which can be
damaged if one voltage rail is present without
the other.
New PL-P Series - comprehensive remote control facilities
New PL-P Series
Interfacing to every application
Bench and System use
The New PL-P series includes all of the manual control features of the New PL
series, but adds comprehensive remote control facilities.
The ultra-compact rack-modular sizing makes it ideally suited to rack mounted
system applications, while its user-friendly manual controls are retained for bench
top applications.
Rear Power Terminals
Power and sense terminals are duplicated on the rear panel for rack mount
applications or other situations where rear connection is more appropriate.
Digital Remote Control
To meet the varying needs of today’s engineers, a comprehensive array of
interfaces is provided. RS-232, USB and LAN (Ethernet) with LXI support are
provided as standard. An additional GPIB interface is also optionally available.
Each of the digital bus interfaces provides full control of voltage, current, and
output on/off, plus read-back of voltage, current and status. The interfaces are at
ground potential and are opto-isolated from the output terminals.
RS-232
An RS-232/RS-423 interface is provided for use with legacy systems. This type of
serial interface remains in common useage and is perfectly satisfactory for the
control of power supplies because data speed is not an issue.
USB
USB provides a simple and convenient means of connection to a PC and is
particularly appropriate for small system use. A USB driver is provided which
supports Windows 2000, XP and Vista.
LAN-Ethernet with LXI
The LAN interface uses a standard 10/100 base-T Ethernet hardware connection
with ICMP and TCP/IP Protocol for connection to a Local Area Network or direct
connection to a single PC. This interface supports LXI and is the most appropriate
for larger system use because of its scalable nature.
LXI Compliance
The LAN interface is compliant with LXI-C. LXI (LAN eXtensions for Instrumentation)
is the next-generation, LAN-based modular architecture standard for automated
test systems managed by the LXI Consortium, and is expected to become the
successor to GPIB in many systems. For more information on LXI and how it
replaces GPIB, or operates along side it, go to: www.tti-test.com/go/lxi
IVI Driver
An IVI driver for Windows is included. This provides support for common high-level
applications such as LabView*, LabWindows*, and HP/Agilent VEE*.
GPIB (option G)
Further versions of the products, available from 2009, are fitted with a GPIB (IEEE488) interface in addition to USB, RS232 and LAN.
Rack Mounting
Up to four single output units can be fitted
into one rack width.
Alternatively, any combination of singles
and duals can be used - as in the example
shown.
The TTi RM450 rack mount (shown) is 4U
high and incorporates limited ventilation
space above and below the power
supplies. Blanking plates are provided for
unused positions.
New PL-P Additional Facilities
From the front, New PL-P models are identical to standard New PL models and
retain all of their manual control features. On the dual output versions, a single
digital interface controls both outputs.
The rear panel carries RS-232, USB and LAN (Ethernet) connectors, together
with analog in and out, remote on/off control*, and duplicate output and sense
terminals. All models can be additionally fitted with a GPIB interface (option G
- factory fit only, available in 2009).
* Note: analog in/out and remote on/off are not fitted to the dual output versions.
Analog Remote Control
Single output PL-P units include analog voltage control of
voltage and current (non-isolated). Analog control outputs
are also incorporated to enable easy parallel connection of
multiple units in a master-slave configuration.
Terminals for remote on/off control are also provided.
New PL series - Technical Specifications
MODEL RANGE:
PL155
PL303
PL601
PL303QMD
Note: 120V and 250V models are
0 to 15V at 0 to 5A
planned, please check our web site
0 to 30V at 0 to 3A
for fully up to date information.
0 to 60V at 0 to 1.5A
2 x (0 to 30V at 0 to 3A), or 1 x (0 to 30V at 0 to 6A)
OUTPUT SPECIFICATIONS
Voltage/Current Levels
PL155
0V to 15V/0.1mA to 5A (75W max.)
PL303
0V to 30V/0.1mA to 3A (90W max.)
PL601
0V to 60V/0.1mA to 1·5A ( 90W max.)
PL303QMD
Dual outputs of 0V to 30V/0.1mA to 3A
or single output of 0V to 30V/0.2mA to 6A (180W max.)
Note: Actual maxima for voltage and current are typically 1% greater than the figures given above.
Output Setting & Control
Voltage Setting:
Current Setting:
Output Mode:
Output Switch:
View Settings:
By coarse and fine controls.
By single logarithmic control.
Constant voltage or constant current with automatic cross-over.
CC indicator lit in constant current mode.
Electronic, non isolating. Preset voltage and current limit displayed
when Output is off. Output rise time no load <15ms.
With the output On, the meters show actual voltage and current.
The preset levels can be viewed and adjusted at any time by pressing
the View Settings button.
V-Span
(Voltage Span Control)
The voltage adjustment range can be controlled by digital setting of the end-stop values of
the coarse voltage control to any desired values. The range for Vmax is 0.1V to 15V/30V/60V
depending on model. The range for Vmin is 0 to (Vmax – 0.1V).
S-Lock
(Settings Lock)
Voltage and current settings can be locked by a single button press. Lock accuracy is equal to
the meter accuracy (see Meter Specification).
Output Performance
Ripple & Noise:
Normal mode voltage: <0·4mV rms and 2mV p-p
Normal mode current: <0·2mArms; <40uA on 500mA range.
Common mode current: <5uA rms
Load Regulation:
Voltage - <0·01% + 2mV.
Current - typically 0·01% + 500µA.
Voltage specification applies for any load change, measured at the output terminals. When using
remote sense add 0.5mV per 0.1V drop in the +ve output lead (max. sense lead resistance 0.5 W).
Line Regulation:
Voltage <0·01% + 2mV for 10% line change.
Current <0·01% + 250µA. for 10% line change.
Transient Response: <50µs to within 50mV of setting for a 90% load change.
Temp. Coefficient: Voltage: typically <(50ppm + 0·5mV)/°C
Current: typically <(100ppm + 1mA)/°C;
<(100ppm + 0.1mA)/°C on 500mA range.
Output Protection
Output Protection: OVP and OCP Trips:
Over-temperature: Safety Interlocks:
Output will withstand forward voltages of up to 20V above rated
output voltage. Reverse protection by diode clamp for currents to 3A.
Voltage or current measured to be in excess of 105% of the rated
maximum will cause the output to trip off.
Output trips off for over-temperature.
Operations that could cause an unexpected change in voltage or
current settings are interlocked with the output switch.
Output Connections
Output Terminals: Universal 4mm safety binding posts on 19mm (0·75”) spacing.
Terminals can accept fixed shroud 4mm plugs, standard 4mm plugs, fork terminals and bare wires.
Remote Sense
Sense Selection:
Sense Terminals:
Voltage sensing is selected as Local or Remote by front panel switch.
Sprung loaded screw-less terminals.
METER SPECIFICATIONS
Display Type:
Dual 4-digit meters, 10mm (0·39”) LED.
Voltage Meter
Resolution: Accuracy:
10mV
± (0·1% of reading + 10mV)
Current Meter
Resolution:
Accuracy:
Meter Damping:
1mA (0·1mA on 500mA range)
± (0·3% + 3mA) to 3A; ± (0·5% + 3mA) to 6A;
± (0·3% + 0·3mA) on 500mA range
Normally 20ms, switchable to 2 sec for averaging rapidly varying loads.
ADDITIONAL SPECIFICATIONS - QUAD-MODE DUAL (PL303QMD)
The PL303QMD has four modes of operation:
Independent Mode
Each output is fully independent and isolated. Operation is equivalent to two single output
power supplies.
Tracking Mode
The two outputs remains isolated, but the Slave voltage controls are disabled and the Slave
voltage is set equal to the Master voltage. This can be used to generate tracking bipolar
voltages, or tracking unipolar voltages relative to different grounds. When voltages greater
than 30V are required, the outputs can be wired in series to generate 0 to 60V using only
the Master voltage controls.
Track Accuracy:
Slave voltage = ± (0·1% of Master voltage setting + 10mV)
Ratio (%) Tracking Mode
As Tracking, but the Slave voltage controls set an output voltage between 0% and 101%
of the Master voltage. Once the Slave voltage has been set, varying the Master voltage will
create the same percentage change in the Slave voltage setting.
Track Accuracy:
% change in Slave voltage = % change of Master voltage ± 0.1% ± 10mV
Parallel Mode
In this mode, the Master operates as a single output power supply with double the current
capability (0.2mA to 6A). The Slave is disabled and its displays are turned off.
Both On / Both Off
Each output has an independent DC On/Off control, however, additional control buttons are
provided which turn both outputs on or off simultaneously. These buttons operate in all four
modes.
GENERAL SPECIFICATIONS
Input
AC Input:
Input Power:
230V AC or 115V AC ± 10%, 50/60Hz. Installation Category II
Single output models - 280VA max.; Dual output models - 560VA max.
Temperature & Environmental
Operating Range:
Storage Range:
Environmental:
Cooling:
+5ºC to +40ºC, 20% to 80% RH
-40ºC to + 70ºC
Indoor use at altitudes up to 2000m, Pollution Degree 2.
Intelligent variable-speed low noise fan assists convection.
Safety & EMC
Safety:
EMC:
Complies with EN61010-1
Complies with EN61326
Physical
Size:
Weight:
Single output models - 107mm x 131mm (¼ rack 3U) x 288mm,
Dual output models - 214mm x 131mm (½ rack 3U) x 288mm
(sizes exclude feet, knobs and terminals).
Single output models - 4·5kg; Dual output models - 8.5kg
OPTIONS
Rack Mount (RM450)
19 inch 4U rack mount suitable for up to four single power supplies, two dual power supplies,
or any mixture. Blanking plates are provided for unused positions. The 4U height provides
limited ventilation space above and below the power supplies.
Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the
right to alter specifications without prior notice.
New PL-P Series specifications
Additional specifications applying to the New PL-P Series are on the following page.
New PL-P series - Additional Technical Specifications
REMOTE ANALOG ON/OFF CONTROL (single output models only)
MODEL RANGE
General
New PL-P series units offer remote control and read-back using analog, RS232, USB, LAN
(LXI) interfaces. They retain all of the capabilities of the New PL Series when under manual
control.
All of the specifications from the previous page therefore apply to the equivalent models in
the New PL-P series. The following specifications are additional.
Versions with a GPIB interface will also be available - see below.
Model Range
PL155-P
PL303-P
PL601-P
PL303QMD-P
Note: 120V and 250V models are
0 to 15V at 0 to 5A
planned, please check our web site
0 to 30V at 0 to 3A
for fully up to date information.
0 to 60V at 0 to 1.5A
2 x (0 to 30V at 0 to 3A), or 1 x (0 to 30V at 0 to 6A)
REAR TERMINALS
Power and sense connections are duplicated on the rear panel using a screw-less connector
block.
DIGITAL BUS INTERFACES - RS-232, USB, LAN (LXI)
The standard PL-P product offers full remote control and read-back using RS-232, USB or LAN
(LXI-C). All interfaces are at ground potential and opto-isolated from the output terminals.
Note: Remote/Local Sense, and Operational Mode (PL303QMD-P) are manually selectable only.
RS-232
Standard 9-pin D connector. Baud rate 9,600.
USB
Standard USB 2.0 connection (backwards compatible with USB 1.x). Operates as a virtual
COM port.
Ethernet (LAN)
Standard 10/100 base-T hardware connection. ICMP and TCP/IP Protocol for connection to
Local Area Network or direct connection to a single PC.
LXI Compliance
LAN interface is compliant with LXI-C. (LXI is the abbreviation for Lan eXtensions for
Instrumentation). For more information visit: www.tti-test.com/go/lxi
GPIB INTERFACE (Option G, factory fit only)
Option G, available from 2009, adds a GPIB (IEEE-488) interface.
This is in addition to the RS-232, USB and LAN interfaces of the standard PL-P product. The
interface conforms with IEEE-488.1 and IEEE-488.2.
DIGITAL PROGRAMMING PERFORMANCE
Voltage Setting
Setting Resolution:
Setting Accuracy:
1mV
± (0.05% +10mV)
Current Setting
Setting Resolution:
Setting Accuracy:
0.1mA (0.01mA on 500mA range)
± (0.3% +0.005A) to 3A, ± (0.5% +0.005A) to 6A,
± (0.3% +0.5mA) on 500mA range
Programming Speed
Command Delay:
Typically <80ms (this must be added to any of the figures below)
Voltage Up Time:
Typically <45ms* to 1%
Voltage Down Time: Typically <20ms* to 1% (full load); typically <150ms* to 1% (no load)
* The up and down times vary with model, current range and voltage step size. More
information is contained in the operating manual which can be downloaded from our web
site.
OVP and OCP PROTECTION
Measure-and-compare over-voltage and over-current protection are implemented in firmware
and can be set via the remote interfaces only. Output trips Off for OVP and OCP conditions.
Setting resolution: 10mV and 1mA.
Response time: typically 500ms
ANALOG REMOTE CONTROL (single output models only)
Non-isolated analog voltage control of voltage and current. Analog control outputs are also
provided to enable easy parallel connection of multiple units in a master-slave configuration.
Note that the PL303QMD-P does not have analog remote control.
Scaling
Reference Point:
Set Voltage Input:
Set Current Input:
Voltage Output:
Current Output:
All control voltage are referenced to the positive output terminal
0V to 10V sets 0 to 100% of rated output (e.g. 0 to 30V for PL303-P).
Alternative scaling of 0V to 5V (selectable using internal link).
0V to 10V sets 0 to 100% of rated output (e.g. 0 to 3A for PL303-P).
Alternative scaling of 0V to 5V (selectable using internal link).
0 to 100% of rated output voltage generates 0V to 5V.
0 to 100% of rated output current generates 0V to 5V.
Accuracy
Set Voltage Input:
Set Current Input:
Voltage Output:
Current Output:
Non-isolated terminal which sets the output to Off when pulled low by gate signal or relay
closure. Signal is reference to the positive output terminal.
Note that the PL303QMD-P does not have this facility.
GENERAL SPECIFICATIONS
Input
AC Input:
Input Power:
230V AC or 115V AC ± 10%, 50/60Hz. Installation Category II
Single output models - 280VA max.; Dual output models - 560VA max.
Temperature & Environmental
Operating Range:
Storage Range:
Environmental:
Cooling:
+5ºC to +40ºC, 20% to 80% RH
-40ºC to + 70ºC
Indoor use at altitudes up to 2000m, Pollution Degree 2.
Intelligent variable-speed low noise fan assists convection.
Safety & EMC
Safety:
EMC:
Complies with EN61010-1
Complies with EN61326
Physical
Size:
Weight:
Single output models - 107mm x 131mm (¼ rack 3U) x 315mm,
Dual output models - 214mm x 131mm (½ rack 3U) x 288mm
(sizes exclude feet, knobs and terminals).
Single output models - 4·9kg;
Dual output models - 8.6kg
DRIVER SOFTWARE SUPPLIED
IVI Driver
An IVI driver for Windows is supplied. This provides support for common applications such as
LabView*, LabWindows*, HPVEE* etc.
USB Driver
An installation file is supplied which calls a standard Windows* USB driver.
* LabView and LabWindows are trademarks of National Instruments.
HPVEE (now Agilent VEE) is a trademark of Agilent Technologies.
* USB interface is supported for Windows 2000, XP, and Vista.
Windows is a trademark of Microsoft.
OPTIONS
Rack Mount (RM450)
19 inch 4U rack mount suitable for up to four single power supplies, two dual power supplies,
or any mixture. Blanking plates are provided for unused positions. The 4U height provides
limited ventilation space above and below the power supplies.
GPIB Interface (Option G)
Option G, available from 2009, adds a GPIB (IEEE-488) interface. This is a factory-fit option
only.
Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the
right to alter specifications without prior notice.
Remote Control Interfaces Table
Model
Analog RS-232
PL155
PL303
PL601
PL303QMD
PL155-P
•
•
PL303-P
•
•
PL601-P
•
•
PL303QMD-P
•
PL155-P(G)
•
•
PL303-P(G)
•
•
PL601-P(G)
•
•
PL303QMD-P(G)
•
USB
LAN (LXI)
GPIB
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
NOTE: models with the G option will not be available until 2009
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
± (0.3% +10mV); Input Impedance = 100kW
± (0.5% +0.005A); Input Impedance = 64kW
± (0.3% +10mV); Output Impedance = 125W
± (0.5% +0.005A); Output Impedance = 125W
Note that Analog control of current can not be used with the 500mA range selected.
Brochure Part No. 82100-1350
QL series precision dc power supplies
the ultimate in laboratory power !
Questions & Answers
u Why do I need a precision PSU ?
Every engineer needs to have confidence
in their equipment. A power supply is one
of the most fundamental of bench
instruments.
You need certainty that the voltage you apply to a circuit is precisely what you want it
to be.
1mV resolution right up to maximum output
You need certainty that the output of your
power supply is clean and stable.
MAIN OUTPUT(S)
QL series - digitally controlled precision
The QL series represents the ultimate in
laboratory power.
No other power supply offers its combination of performance and convenience.
Digital control gives greatly increased stability, resolution and accuracy.
The advanced user interface provides
fast, simple and foolproof operation.
Optimised all-linear regulation gives very
low noise and excellent dynamics.
Multiple ranges provide greater flexibility in
the choice of voltage and current.
A wealth of convenience features are
available at the touch of a button.
Optional bus interfaces offer high performance remote control operation.
u
Advanced dc power supply range, single or triple output
u
Very high precision, very low noise, excellent dynamics
u
Advanced user interface with numeric and rotary control
u
Multiple voltage/current ranges for increased flexibility
u
Multiple non-volatile memories for power supply set-ups
u
Switchable remote sense provides perfect load regulation
u
Comprehensive protection including OVP and OCP trips
QL output noise versus typical bench PSU
You need the ability to define a precise
voltage at the load and maintain regulation
independent of lead resistances.
Technical Specifications
u
Compact bench footprint; modular width for rack mounting
u
Auxiliary output of 5.0V, 3.3V or 2.7V (QL355T and TP)
u
Bus programmable via GPIB, RS-232 or USB (P models)
u
Duplicate power and sense terminals at rear (P models)
Side Views
Rear Panel Connections
Selectable local or remote sensing
Duplicate Output
Terminals
(P models only)
u What about complexity ?
The QL series can be as simple or as
sophisticated as you want it to be.
Setting voltage and current is as easy as
using a calculator. Or select Jog wheel
control and make all of your adjustments
using just the rotary knob.
When you don’t need the advanced features you don’t have to use them.
However, we believe that you’ll soon find
many of the capabilities much too useful to
ignore.
RS-232 Interface
(P models only)
IEC Power Inlet
USB Interface
(P models only)
MODEL O/Ps Max V / Max A Max. O/P
Bus
Rear
Size (mm) *
Weight Input
(see specs.)
Power Interfaces Terminals
WxHxD
(kg) VA max.
QL355
1
35V / 5A
105W
No
No
140 x 160 x 290
5.4
250
QL355P
1
35V / 5A
105W
Yes
Yes
140 x 160 x 290
5.5
250
QL564
1
56V / 4A
112W
No
No
140 x 160 x 290
5.4
250
QL564P
1
56V / 4A
112W
Yes
Yes
140 x 160 x 290
5.5
250
QL355T
3
35V / 5A (x 2)
215W
No
No
280 x 160 x 290
10.5
500
plus auxiliary
QL355TP 3
35V / 5A (x 2)
215W
Yes
Yes
280 x 160 x 290
10.6
500
plus auxiliary
* Dimensions exclude feet and terminals
Number of Stores:
Memory Type:
Parameters Stored:
Recall system:
10 (30 total on QL355T and TP) plus power-down store.
Non-volatile using EEPROM.
Range, Set volts, Set current, OVP, OCP.
Settings are previewed onto the displays before being
actioned.
LINK & COPY - QL355T & TP
Each output can be controlled independently or can be linked. When linked, keyboard and jog wheel control operates on both outputs simultaneously.
Linked mode can be used to create tracking outputs, or for convenient series or
parallel operation of the two outputs.
A Copy function is available which copies all of the settings for output 1 to output
2 (Range, Set volts, Set current, OVP, OCP).
Linked mode can also be used to store the settings for both outputs to a group of
common memory stores when simultaneous recall is required.
(Note: Linked mode can be selected with differing voltage and current settings on
the two outputs. However both outputs must be set to the same range.)
THURLBY THANDAR INSTRUMENTS
QL Series
AUXILIARY OUTPUT - QL355T & TP
Output Voltage:
Output Current:
DC Output Switch:
Output Terminals:
Output Protection:
Load Regulation:
Line Regulation:
Switchable 2.7V, 3.3V or 5.0V. Accuracy better than ±5%.
>1.0 A maximum. LED indication of over-current.
Sets output voltage level to zero when Off.
4mm terminals on 19mm (0.75") spacing.
Duplicate terminals at rear (P versions only)
Output will withstand up to 16 V forward voltage. Diode
clamped for reverse voltages and 3 Amps reverse current.
< 1% for 90% load change.
< 0. 1% for 10% line change.
BUS INTERFACES (P Suffix versions)
OUTPUT PROTECTION
Output Protection:
Output will withstand forward voltages of up to 20V above rated
output voltage. Reverse protection by diode clamp for currents
up to 3A..
Fault Condition Trip: The output will be shut down if any of the four trip conditions
listed below occur. In addition to the output being set to Off, an
isolated rear panel signal is also activated.
Over Voltage (OVP): Settable 1V to 40V (QL355) or 62V (QL564) in 0.1V steps
Over Current (OCP): Settable 0.1A to 5.5A (QL355) or 4.4A (QL564) in 0.01A steps
Over Temperature: Monitors internal temperature rise to protect against excess
ambient temperature or blocked ventilation slots.
Sense Error:
Monitors the voltage between the remote sense terminals and
output terminals to protect against mis-wiring.
Trip Output Signal: Isolated open-collector output signal on rear panel.
METERING
Display Type:
GPIB (IEEE-488) Interface
(P models only)
u How much extra am I paying ?
Surprisingly little.
Despite its wealth of features, a QL series
PSU costs little more than a conventional
bench power supply of good quality.
Unlike offerings from some other
manufacturers, you can choose to buy it
without the bus interface, thus saving
money in the many situations where remote control is not required.
Alarm
Output
QL355, QL355P, QL355T, QL355TP
Max. Output Power: 105 watts
Output Ranges:
Range 1 - 0 to 35V, 0 to 3A
Range 2 - 0 to 15V, 0 to 5A
Range 3 - 0 to 35V, 0 to 500.0mA
QL564, QL564P
Max. Output Power: 112 watts
Output Ranges:
Range 1 - 0 to 56V, 0 to 2A
Range 2 - 0 to 25V, 0 to 4A
Range 3 - 0 to 56V, 0 to 500.0mA
All Models
Voltage Setting:
By floating point numeric entry or rotary jog wheel;
resolution 1mV.
Current Setting:
By floating point numeric entry or rotary jog wheel;
resolution 1mA or 0.1mA depending on range.
Setting Accuracy:
Voltage - 0.03% ±5mV. Current 0.2% ±5mA/0.5mA
Output Mode:
Operation in constant voltage or constant current modes
with automatic cross-over and mode indication by LEDs.
DC Output Switch:
Sets output voltage and current levels to zero when Off.
Output Terminals:
4mm terminals on 19mm (0.75") spacing.
Duplicated on rear terminal block (P versions only)
Load Regulation:
<0.01% of maximum output for 50% load change
Line Regulation:
<0.01% of maximum output for 10% line voltage change
Ripple and Noise:
Typically <0.35mV rms CV mode, and <0.2mA rms CI mode
(<20µA rms on 500mA range)
Transient Response: <20usec to within 15mV of setting for 90% load change
o
Temperature Coeff.: <±(50ppm+0.5mV)/ C (voltage)
Remote Sense:
Eliminates up to 0.5V drop per lead. Remote sense operation selected from front panel and indicated by LED
Sense Terminals:
Recessed sprung sockets for direct insertion of wires
Duplicated on rear terminal block (P versions only)
SETTINGS MEMORIES
Dual digital displays per output using 14mm (0.56") high
brightness LEDs. 5 digits for voltage, 4 digits for current.
Update rate 4 per second.
Meter Function:
Voltage meter shows set voltage when in CV mode and
measured voltage when in CI mode.
Current meter shows measured current when in CV mode
and set current when in CI mode.
Limits Display:
With the dc output switch set to Off, both meters show the
set values (i.e. the limits). With the output On, either the
voltage meter or current meter will show a measured value
(depending on the CV/CI mode). Pressing the Limits button
will provide a temporary display of the set values.
Watts (VxA) Display: The voltage meter can be made to show the instantaneous
calculated product of voltage and current. The value displayed is equal to the equivalent power at the moment when
the button is pressed and remains whilst the button is held.
Meter Resolution:
Voltage: 1mV (CV mode) or 10mV (CI mode)
Current: 1mA or 0.1mA depending on range
Power: 0.01W or 0.001W depending on range
Meter Accuracy:
Voltage: 0.1% of reading ±10 mV (CI mode)
Current: 0.2% of reading ± 0.005A or 0.5mA (CV mode)
Power: 0.3% of reading ± 0.05W or 0.005W
USB:
Standard USB harware connection. Supplied with device
driver for Win98 or above. Operates as a virtual COM port.
RS-232:
Variable baud rate 19,200 max. Single instrument or
Addressable RS232 Chain (ARC) system.
GPIB:
Conforming with IEEE-488.1 and IEEE-488.2
N.B. All three interfaces incorporate full control, readback and status reporting.
Bus Type Selection: From front panel (GPIB/RS232/USB).
Address Selection: From front panel (1 to 31).
Baud Selection:
RS-232 only. From front panel (600 to 19200 baud).
Setting Resolution: Voltage - 1mV, Current 0.1mA (0.01mA on 500mA range).
Readback Resolution: Voltage - 10mV, Current 1mA (0.1mA on 500mA range).
Accuracy:
See specifications under Outputs and Metering.
Remote Command Response Time:
Interface:
<80 ms (command processing time).
Output Voltage :
Response time varies with range and load conditions.
Typical time to settle to within 1% of the total excursion on a
35V/3A range with full load is <25ms. With no load it is
<7 ms for an upward change and <600ms for downward.
GENERAL
Power Requirements: 230V or 115V ± 10% (internally adjustable).
Installation category II. See table for VA rating.
o
o
Environmental:
Operating Range: 5 C to 40 C, 20% to 80% RH
o
o
Storage Range: -40 C to +70 C
Size and Weight:
See Table
Electrical Safety:
Designed and manufactured to comply with IEC1010-1.
EMC:
Designed and manufactured to comply with EN61326.
Benchtop Operation: Folding legs are incorporated that can be used to angle the
front panel upwards when required.
Rack Mount Option: 19 inch 4U mount for up to three single output units or one
triple plus one single. Blanking plates are available for unused sections.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development
and reserves the right to alter specifications without prior notice. Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Precision laboratory dc linear power supplies
unrivalled accuracy, resolution, stability & noise
advanced user interface gives superior control
multiple output ranges provide greater flexibility
full bus programmability via GPIB, RS232 or USB
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE29 7DR England (UK)
Tel: (0)1480 412451 Fax: (0)1480 450409
Web: www.tti-test.com Email: [email protected]
82100-1190
QL series precision dc power supplies
the ultimate in laboratory power !
The QL represents the ‘next generation’
of high performance laboratory power
supplies, maintaining the tradition started
with the PL series in 1980 and continued
throughout more than two decades.
Unmatched precision
The QL series offers an unparalleled level
of precision. Voltage and current are
controlled using instrumentation quality 16
bit DACs enabling voltages to be set to
1mV resolution even at full output.
Indeed, the accuracy is sufficient for the
QL to be used as a calibration source for
some hand-held DMMs.
Multiple ranges
for greater flexibility
The QL series provides multiple ranges for
increased current capability at lower voltages. The QL355, for example, is a 100W
PSU with three ranges.
The main range offers 0 to 35 volts at up to
3 amps. The higher current range provides
up to 5 amps for voltages up to 15V.
A further low current range provides an
enhanced current setting and measurement resolution of 0.1mA.
Unrivalled performance
Fast, simple and safe
to use
The user interface of the QL series has
been painstakingly designed to provide
rapid control whilst guarding against any
possibility of error.
Unlike other digitally controlled units, the
QL series provides both numeric and rotary control.
Illuminated keys and display legends provide instant confirmation of settings and
status.
Voltage and current setting can be performed in either of two ways:
One third or two third
rack width, 4U height
Linear regulation with more than 100 watts per output
multiple ranges for increased flexibility
Direct numeric entry
Incremental rotary control
Instant Limits view
Settings can be made by direct numeric
entry using the 0 to 9 keypad.
Each new setting is previewed on the display and must be confirmed with the OK
key.
Settings recalled from memory are similarly previewed and confirmed.
Numeric setting is very fast requiring only
three key presses to set to 5 volts, for example, (V, 5, OK).
To set a more precise level such as 12.725
volts requires more key presses, but can
still be done in seconds.
For those preferring quasi-analogue control, or for applications where the voltage
or current must be gradually changed, the
Jog wheel is available.
The wheel has a positive stepped action
but can be spun rapidly when required.
Output voltage can be incremented or
decremented in steps of 0.1V, 10mV or
1mV. Current steps can be selected from
0.1A down to 0.1mA.
The Jog function can be left permanently
engaged or can be disabled at the touch of
a button.
To enable the current limit to be set before
connecting the load, the limit setting is displayed when the output is set to Off.
With the output set to On, the current meter
shows the load current rather than the limit
setting.
Pressing the Limits key at any time provides a temporary display of the limit values
allowing precise adjustment to be made.
(When operating in CI mode it will be the
load voltage which is displayed with the
output on, and the voltage limit which is
shown using the Limits function).
16-bit precision, 1mV
setting resolution.
Multiple ranges for
increased flexibility.
Duplicate rear terminals
(P versions).
Current resolution
down to 0.1mA.
Watts display
(V x A)
Variable over- voltage
and over- current
protection trips.
The QL series uses pure linear technology
and offers unrivalled performance in terms
of regulation, output noise and dynamics.
Line and load regulation are close to the
limit of measurement.
Recovery time from transient current
pulses is better than 50µs.
Output noise is less than 350µV rms in CV
mode and down to 20µA rms in CI mode
- dramatically better than other PSUs.
The model range
QL355
Single output with ranges of
35V/3A, 15V/5A, 35V/500mA
QL564
Single output with ranges of
56V/2A, 25V/4A, 56V/500mA
QL355T
Two outputs with ranges of
35V/3A, 15V/5A, 35V/500mA
plus one auxilliary output of
2.7V, 3.3V or 5.0V at 1A
QL355P
As QL355 with GPIB, RS-232
and USB interfaces
QL564P
As QL564 with GPIB, RS-232
and USB interfaces
Further facilities -
Fully programmable via
QL355T and QL355TP
GPIB, RS-232 or USB
The QL series provided storage of up to 10
power supply sets-up in non-volatile memory (30 set-ups for a triple).
Upon mains switch-off, the set-up of the
PSU is saved and is automatically restored
at switch-on.
On the QL355T and TP models, independent memories are provided for each output,
plus an additional set for ‘linked’ mode
where the user may wish to recall settings
for both outputs simultaneously.
These triple output models have two main
outputs plus one auxiliary output.
The casing is twice the width of a single
output model (two-thirds rack).
Models with a P suffix incorporate a full
bus interface enabling remote control and
readback via either GPIB (IEEE-488),
RS-232 or USB.
On T models, the single interface address
controls all three outputs.
The GPIB interface conforms fully with
IEEE-488.2 as well as IEEE-488.1.
The serial interface can be used as a
conventional single instrument RS-232
interface or as part of a multi-instrument
ARC system (Addressable RS-232
Chain).
The QL series provides fully adjustable
over-voltage and over-current trips.
These trips can be used both as a fail-safe
against accidental mis-setting and as a protection against inappropriate load conditions.
In addition to turning the output off, a trip
condition switches the rear panel alarm signal enabling other equipment to be controlled.
For complete protection of the power supply, the trip will also be operated by
over-temperature, or excess voltage on the
sense terminals.
Remote or local sense
The QL series provides full remote sense
capability via dedicated sense terminals.
Remote sense is essential to maintain regulation at the load (two 0.01W connection
leads will drop 100mV at 5 amps).
When remote sense is not required, internal local sensing can be selected at the
touch of a button.
Up to 30 memory
stores for voltage
and current settings.
Instant watts display
The product of voltage and current can be
displayed at any time by pressing the
V x A button.
The power is displayed with a resolution
down to 1 milliwatt.
Fully bus
programmable via
GPIB, RS232 or
USB (P versions).
QL355TP As QL355T with GPIB, RS-232
and USB interfaces
Note: Further models may have been added
since this brochure was printed.
Please check our web site (www.tti-test.com)
or contact our sales desk.
Setting memories for
added convenience
OVP and OCP trips
with “alarm” output
Linked mode control for tracking operation
or series and parallel wiring.
Direct numeric setting
of voltage or current.
Remote or local sense
with keypad selection.
Auxiliary output with
selectable voltage.
Rotary control of
voltage and current.
Individual output switches
plus master control.
Fully programmable for bench or system use
GPIB, RS-232 and USB interfaces
Linked mode convenience
The QL355T and TP have two identical
outputs which are both independent and
isolated.
Illuminated keys selects which output is to
be adjusted and provide unambiguous indication.
In situations where the user wishes to set
similar voltages or currents on both outputs, “linked” mode is available. When
linked, all adjustments are applied to both
outputs simultaneously.
Linked mode can provide tracking outputs
and is particularly useful when the user
wishes to wire the outputs in series or
parallel to obtain higher voltages or currents. A “copy” function allows all of the
settings of one output to be duplicated on
the other prior to linking.
For even greater flexibility, the outputs can
be linked when set to different voltages or
currents allowing separate settings to be
loaded into the linked-mode memories for
simultaneous recall.
Auxiliary output for
low voltage circuits
The QL355T and TP incorporate a third
output intended for powering logic and
other low voltage circuitry.
This output is fully isolated from the main
outputs and provides a switchable voltage
of 2.7, 3.3 or 5.0 volts at a current of up to
one amp.
An independent output on/off switch is provided which is bus controllable on the
QL355TP.
Simple and consistent
bus control
QL series supplies use simple and consistent command structures which make programming particularly easy regardless of
which interface is used.
Drivers for LabWindows* CVI and Labview*
IVI are available enabling these PSUs to
easily be included within systems that
incorporate instruments from a variety
of manufacturers.
USB support
High resolution control
and readback
The QL bus interface incorporates a USB
connection in addition to RS232 and
GPIB.
USB represents the future for medium
speed PC connectivity and enables multiple devices to be connected.
A Windows device driver is supplied which
creates a virtual COM port, enabling USB
to be used with applications that do not directly support it.
All power supply settings can be controlled
via the bus. Voltage and current can be set
to a resolution of 1mV or 0.1mA for each
main output. Actual voltage and current
can be read back along with the power
supply status.
N.B. Control of the auxiliary output on T
models is limited to output on-off and monitoring of overload status.
Rear terminals
P versions incorporate output power and
sense terminals on the rear panel in addition to the front panel.
Fully isolated outputs for
maximum flexibility
Each output is fully floating and is
opto-isolated from the bus interface.
On triple output models the two main outputs can be linked in series or parallel to
produce higher voltages or higher currents
as required.
Compact design for
bench or rack
The QL series are highly compact with a
small footprint for bench use.
Fold-away feet are incorporated which can
be used to angle the front panel upwards.
Single output models are one-third rack
width, whilst triple output models are two
thirds rack width.
A universal rack mount tray is available
which will mount one, two or three singles,
one triple, or one triple plus one single.
On P versions, rear output terminals are
provided for system use.
Comprehensive output
control
Each output has its own illuminated dc
on/off key providing completely independent control.
For situations where power needs to be
connected or disconnected from all three
outputs together, master on/off keys are
also provided.
* LabWindows and LabView are trademarks of
National Instruments Inc.
QL series precision dc power supplies
the ultimate in laboratory power !
The QL represents the ‘next generation’
of high performance laboratory power
supplies, maintaining the tradition started
with the PL series in 1980 and continued
throughout more than two decades.
Unmatched precision
The QL series offers an unparalleled level
of precision. Voltage and current are
controlled using instrumentation quality 16
bit DACs enabling voltages to be set to
1mV resolution even at full output.
Indeed, the accuracy is sufficient for the
QL to be used as a calibration source for
some hand-held DMMs.
Multiple ranges
for greater flexibility
The QL series provides multiple ranges for
increased current capability at lower voltages. The QL355, for example, is a 100W
PSU with three ranges.
The main range offers 0 to 35 volts at up to
3 amps. The higher current range provides
up to 5 amps for voltages up to 15V.
A further low current range provides an
enhanced current setting and measurement resolution of 0.1mA.
Unrivalled performance
Fast, simple and safe
to use
The user interface of the QL series has
been painstakingly designed to provide
rapid control whilst guarding against any
possibility of error.
Unlike other digitally controlled units, the
QL series provides both numeric and rotary control.
Illuminated keys and display legends provide instant confirmation of settings and
status.
Voltage and current setting can be performed in either of two ways:
One third or two third
rack width, 4U height
Linear regulation with more than 100 watts per output
multiple ranges for increased flexibility
Direct numeric entry
Incremental rotary control
Instant Limits view
Settings can be made by direct numeric
entry using the 0 to 9 keypad.
Each new setting is previewed on the display and must be confirmed with the OK
key.
Settings recalled from memory are similarly previewed and confirmed.
Numeric setting is very fast requiring only
three key presses to set to 5 volts, for example, (V, 5, OK).
To set a more precise level such as 12.725
volts requires more key presses, but can
still be done in seconds.
For those preferring quasi-analogue control, or for applications where the voltage
or current must be gradually changed, the
Jog wheel is available.
The wheel has a positive stepped action
but can be spun rapidly when required.
Output voltage can be incremented or
decremented in steps of 0.1V, 10mV or
1mV. Current steps can be selected from
0.1A down to 0.1mA.
The Jog function can be left permanently
engaged or can be disabled at the touch of
a button.
To enable the current limit to be set before
connecting the load, the limit setting is displayed when the output is set to Off.
With the output set to On, the current meter
shows the load current rather than the limit
setting.
Pressing the Limits key at any time provides a temporary display of the limit values
allowing precise adjustment to be made.
(When operating in CI mode it will be the
load voltage which is displayed with the
output on, and the voltage limit which is
shown using the Limits function).
16-bit precision, 1mV
setting resolution.
Multiple ranges for
increased flexibility.
Duplicate rear terminals
(P versions).
Current resolution
down to 0.1mA.
Watts display
(V x A)
Variable over- voltage
and over- current
protection trips.
The QL series uses pure linear technology
and offers unrivalled performance in terms
of regulation, output noise and dynamics.
Line and load regulation are close to the
limit of measurement.
Recovery time from transient current
pulses is better than 50µs.
Output noise is less than 350µV rms in CV
mode and down to 20µA rms in CI mode
- dramatically better than other PSUs.
The model range
QL355
Single output with ranges of
35V/3A, 15V/5A, 35V/500mA
QL564
Single output with ranges of
56V/2A, 25V/4A, 56V/500mA
QL355T
Two outputs with ranges of
35V/3A, 15V/5A, 35V/500mA
plus one auxilliary output of
2.7V, 3.3V or 5.0V at 1A
QL355P
As QL355 with GPIB, RS-232
and USB interfaces
QL564P
As QL564 with GPIB, RS-232
and USB interfaces
Further facilities -
Fully programmable via
QL355T and QL355TP
GPIB, RS-232 or USB
The QL series provided storage of up to 10
power supply sets-up in non-volatile memory (30 set-ups for a triple).
Upon mains switch-off, the set-up of the
PSU is saved and is automatically restored
at switch-on.
On the QL355T and TP models, independent memories are provided for each output,
plus an additional set for ‘linked’ mode
where the user may wish to recall settings
for both outputs simultaneously.
These triple output models have two main
outputs plus one auxiliary output.
The casing is twice the width of a single
output model (two-thirds rack).
Models with a P suffix incorporate a full
bus interface enabling remote control and
readback via either GPIB (IEEE-488),
RS-232 or USB.
On T models, the single interface address
controls all three outputs.
The GPIB interface conforms fully with
IEEE-488.2 as well as IEEE-488.1.
The serial interface can be used as a
conventional single instrument RS-232
interface or as part of a multi-instrument
ARC system (Addressable RS-232
Chain).
The QL series provides fully adjustable
over-voltage and over-current trips.
These trips can be used both as a fail-safe
against accidental mis-setting and as a protection against inappropriate load conditions.
In addition to turning the output off, a trip
condition switches the rear panel alarm signal enabling other equipment to be controlled.
For complete protection of the power supply, the trip will also be operated by
over-temperature, or excess voltage on the
sense terminals.
Remote or local sense
The QL series provides full remote sense
capability via dedicated sense terminals.
Remote sense is essential to maintain regulation at the load (two 0.01W connection
leads will drop 100mV at 5 amps).
When remote sense is not required, internal local sensing can be selected at the
touch of a button.
Up to 30 memory
stores for voltage
and current settings.
Instant watts display
The product of voltage and current can be
displayed at any time by pressing the
V x A button.
The power is displayed with a resolution
down to 1 milliwatt.
Fully bus
programmable via
GPIB, RS232 or
USB (P versions).
QL355TP As QL355T with GPIB, RS-232
and USB interfaces
Note: Further models may have been added
since this brochure was printed.
Please check our web site (www.tti-test.com)
or contact our sales desk.
Setting memories for
added convenience
OVP and OCP trips
with “alarm” output
Linked mode control for tracking operation
or series and parallel wiring.
Direct numeric setting
of voltage or current.
Remote or local sense
with keypad selection.
Auxiliary output with
selectable voltage.
Rotary control of
voltage and current.
Individual output switches
plus master control.
Fully programmable for bench or system use
GPIB, RS-232 and USB interfaces
Linked mode convenience
The QL355T and TP have two identical
outputs which are both independent and
isolated.
Illuminated keys selects which output is to
be adjusted and provide unambiguous indication.
In situations where the user wishes to set
similar voltages or currents on both outputs, “linked” mode is available. When
linked, all adjustments are applied to both
outputs simultaneously.
Linked mode can provide tracking outputs
and is particularly useful when the user
wishes to wire the outputs in series or
parallel to obtain higher voltages or currents. A “copy” function allows all of the
settings of one output to be duplicated on
the other prior to linking.
For even greater flexibility, the outputs can
be linked when set to different voltages or
currents allowing separate settings to be
loaded into the linked-mode memories for
simultaneous recall.
Auxiliary output for
low voltage circuits
The QL355T and TP incorporate a third
output intended for powering logic and
other low voltage circuitry.
This output is fully isolated from the main
outputs and provides a switchable voltage
of 2.7, 3.3 or 5.0 volts at a current of up to
one amp.
An independent output on/off switch is provided which is bus controllable on the
QL355TP.
Simple and consistent
bus control
QL series supplies use simple and consistent command structures which make programming particularly easy regardless of
which interface is used.
Drivers for LabWindows* CVI and Labview*
IVI are available enabling these PSUs to
easily be included within systems that
incorporate instruments from a variety
of manufacturers.
USB support
High resolution control
and readback
The QL bus interface incorporates a USB
connection in addition to RS232 and
GPIB.
USB represents the future for medium
speed PC connectivity and enables multiple devices to be connected.
A Windows device driver is supplied which
creates a virtual COM port, enabling USB
to be used with applications that do not directly support it.
All power supply settings can be controlled
via the bus. Voltage and current can be set
to a resolution of 1mV or 0.1mA for each
main output. Actual voltage and current
can be read back along with the power
supply status.
N.B. Control of the auxiliary output on T
models is limited to output on-off and monitoring of overload status.
Rear terminals
P versions incorporate output power and
sense terminals on the rear panel in addition to the front panel.
Fully isolated outputs for
maximum flexibility
Each output is fully floating and is
opto-isolated from the bus interface.
On triple output models the two main outputs can be linked in series or parallel to
produce higher voltages or higher currents
as required.
Compact design for
bench or rack
The QL series are highly compact with a
small footprint for bench use.
Fold-away feet are incorporated which can
be used to angle the front panel upwards.
Single output models are one-third rack
width, whilst triple output models are two
thirds rack width.
A universal rack mount tray is available
which will mount one, two or three singles,
one triple, or one triple plus one single.
On P versions, rear output terminals are
provided for system use.
Comprehensive output
control
Each output has its own illuminated dc
on/off key providing completely independent control.
For situations where power needs to be
connected or disconnected from all three
outputs together, master on/off keys are
also provided.
* LabWindows and LabView are trademarks of
National Instruments Inc.
QL series precision dc power supplies
the ultimate in laboratory power !
The QL represents the ‘next generation’
of high performance laboratory power
supplies, maintaining the tradition started
with the PL series in 1979 and continued
throughout more than two decades.
Unmatched precision
The QL series offers an unparalleled level
of precision. Voltage and current are
controlled using 16 bit DACs enabling voltages to be set to 1mV resolution even at
full output.
Indeed, the accuracy is sufficient for the
QL to be used as a calibration source for
some hand-held DMMs.
Multiple ranges
for greater flexibility
The QL series provides multiple ranges for
increased current capability at lower voltages. The QL355, for example, is a 100W
PSU with three ranges.
The main range offers 0 to 35 volts at up to
3 amps. The higher current range provides
up to 5 amps for voltages up to 15V.
A further low current range provides an
enhanced current setting and measurement resolution of 0.1mA.
Unrivalled performance
Fast, simple and safe
to use
The user interface of the QL series has
been painstakingly designed to provide
rapid control whilst guarding against any
possibility of error.
Unlike other digitally controlled units, the
QL series provides both numeric and rotary control.
Illuminated keys and display legends provide instant confirmation of settings and
status.
Voltage and current setting can be performed in either of two ways:
One third or two third
rack width, 4U height
Linear regulation with more than 100 watts per output
multiple ranges for increased flexibility
Direct numeric entry
Incremental rotary control
Instant Limits view
Settings can be made by direct numeric
entry using the 0 to 9 keypad.
Each new setting is previewed on the display and must be confirmed with the OK
key.
Settings recalled from memory are similarly previewed and confirmed.
Numeric setting is very fast requiring only
three key presses to set to 5 volts, for example, (V, 5, OK).
To set a more precise level such as 12.725
volts requires more key presses, but can
still be done in seconds.
For those preferring quasi-analogue control, or for applications where the voltage
or current must be gradually changed, the
Jog wheel is available.
The wheel has a positive indented action
but can be spun rapidly when required.
Output voltage can be incremented or
decremented in steps of 0.1V, 10mV or
1mV. Current steps can be selected from
0.1A down to 0.1mA.
The Jog function can be left permanently
engaged or can be disabled at the touch of
a button.
To enable the current limit to be set before
connecting the load, the limit setting is displayed when the output is set to Off.
With the output set to On, the current meter
shows the load current rather than the limit
setting.
Pressing the Limits key at any time provides a temporary display of the limit values
allowing precise adjustment to be made.
(When operating in CI mode it will be the
load voltage which is displayed with the
output on, and the voltage limit which is
shown using the Limits function).
16-bit precision, 1mV
setting resolution.
Multiple ranges for
increased flexibility.
Duplicate rear terminals
(P versions).
Current resolution
down to 0.1mA.
Watts display
(V x A)
Variable over- voltage
and over- current
protection trips.
The QL series uses pure linear technology
and offers unrivalled performance in terms
of regulation, output noise and dynamics.
Line and load regulation are close to the
limit of measurement.
Output noise is less than 350µV rms.
Recovery time from transient current
pulses is better than 50µs.
Single output with ranges of
35V/3A, 15V/5A, 35/500mA
QL564
Single output with ranges of
56V/2A, 25V/4A, 56V/500mA
QL355T
Two outputs with ranges of
35V/3A, 15V/5A, 35V/500mA
plus one auxilliary output of
2.7V, 3.3V or 5.0V at 1A
QL355P
As QL355 with GPIB, RS-232
and USB interfaces
QL564P
As QL564 with GPIB, RS-232
and USB interfaces
Fully programmable via
QL355T and QL355TP
GPIB, RS-232 or USB
The QL series provided storage of up to 10
power supply sets-up in non-volatile memory (30 set-ups for a triple).
Upon mains switch-off, the set-up of the
PSU is saved and is automatically restored
at switch-on.
On the QL355T and TP models, independent memories are provided for each output,
plus an additional set for ‘linked’ mode
where the user may wish to recall settings
for both outputs simultaneously.
These triple output models have two main
outputs plus one auxiliary output.
The casing is twice the width of a single
output model (two-thirds rack).
Models with a P suffix incorporate a full
bus interface enabling remote control and
readback via either GPIB (IEEE-488),
RS-232 or USB.
On T models, the single interface address
controls all three outputs.
The GPIB interface conforms fully with
IEEE-488.2 as well as IEEE-488.1.
The serial interface can be used as a
conventional single instrument RS-232
interface or as part of a multi-instrument
ARC system (Addressable RS-232
Chain).
The QL series provides fully adjustable
over-voltage and over-current trips.
These trips can be used both as a fail-safe
against accidental mis-setting and as a protection against inappropriate load conditions.
In addition to turning the output off, a trip
condition switches the rear panel alarm signal enabling other equipment to be controlled.
For complete protection of the power supply, the trip will also be operated by
over-temperature, or excess voltage on the
sense terminals.
The QL series provides full remote sense
capability via dedicated sense terminals.
Remote sense is essential to maintain regulation at the load (two 0.03W connection
leads will drop 300mV at 5 amps).
When remote sense is not required, internal local sensing can be selected at the
touch of a button.
Up to 30 memory
stores for voltage
and current settings.
Instant watts display
The product of voltage and current can be
displayed at any time by pressing the
VxA button.
The power is displayed with a resolution
down to 1 milliwatt.
Fully bus
programmable via
GPIB, RS232 or
USB (P versions).
QL355TP As QL355T with GPIB, RS-232
and USB interfaces
Note: Further models may have been added
since this brochure was printed.
Please check our web site (www.tti-test.com) or
contact our sales desk.
Further facilities -
Remote or local sense
The model range:
QL355
Setting memories for
added convenience
OVP and OCP trips
with “alarm” output
Linked mode control for tracking operation
or series and parallel wiring.
Direct numeric
setting of voltage or current.
Remote or local sense
with keypad selection.
Auxilliary output with
selectable voltage.
Rotarary control of
voltage and current.
Individual output switches
plus master control.
Fully programmable for bench or system use
GPIB, RS-232 and USB interfaces
Linked mode convenience
The QL355T and TP have two identical
outputs which are both independent and
isolated.
Illuminated keys selects which output is to
be adjusted and provide unambiguous indication.
In situations where the user wishes to set
similar voltages or currents on both outputs, “linked” mode is available. When
linked, all adjustments are applied to both
outputs simultaneously.
Linked mode can provide tracking outputs
and is particularly useful when the user
wishes to wire the outputs in series or
parallel to obtain higher voltages or currents. A “copy” function allows all of the
settings of one output to be duplicated on
the other prior to linking.
For even greater flexibility, the outputs can
be linked when set to different voltages or
currents allowing separate settings to be
loaded into the linked-mode memories for
simultaneous recall.
Auxiliary output for
low voltage circuits
The QL355T and TP incorporate a third
output intended for powering logic and
other low voltage circuitry.
This output is fully isolated from the main
outputs and provides a switchable voltage
of 2.7, 3.3 or 5.0 volts at a current of up to
one amp.
An independent output on/off switch is provided which is bus controllable on the
QL355TP.
Comprehensive output
control
Each output has its own illuminated dc
on/off key providing completely independent control.
For situations where power needs to be
connected or disconnected from all three
outputs together, master on/off keys are
also provided.
USB support
The QL bus interface incorporates a USB
connection in addition to RS232 and
GPIB.
USB represents the future for medium
speed PC connectivity and enables multiple devices to be connected.
A Windows device driver is supplied which
creates a virtual COM port, enabling USB
to be used with applications that do not directly support it.
Rear terminals
P versions incorporate output power and
sense terminals on the rear panel in addition to the front panel.
Fully isolated outputs for
maximum flexibility
Each output is fully floating and is
opto-isolated from the bus interfaces.
On triple output models the two main outputs can be linked in series or parallel to
produce higher voltages or higher currents
as required.
Simple and consistent
bus control
QL series supplies use simple and consistent command structures which make programming particularly easy regardless of
which interface is used.
A driver for LabWindows CVI from National
Instruments is available which enables imports from other equipment to be achieved
within the LabWindows environment.
High resolution control
and readback
All power supply settings can be controlled
via the bus. Voltage and current can be set
to a resolution of 1mV or 0.1mA for each
main output. Actual voltage and current
can be read back along with the power
supply status.
N.B. Control of the auxiliary output on T
models is limited to output on-off and monitoring of overload status.
Compact design for
bench or rack
The QL series are highly compact with a
small footprint for bench use.
Fold-away feet are incorporated which can
be used to angle the front panel upwards.
Single output models are one-third rack
width, whilst triple output models are two
thirds rack width.
A flexible rack mount tray is available
which will mount one, two or three singles,
one triple, or one triple plus one single.
On P versions, rear output terminals are
provided for system use.
QL series precision dc power supplies
the ultimate in laboratory power !
Questions & Answers
u Why do I need a precision PSU ?
Every engineer needs to have confidence
in their equipment. A power supply is one
of the most fundemental pieces of bench
equipment.
You need certainty that the voltage you apply to a circuit is precisely what you want it
to be.
1mV resolution right up to maximum output
You need certainty that the ouput of your
power supply is clean and stable.
MAIN OUTPUT(S)
QL series - digitally controlled precision
The QL series represents the ultimate in
laboratory power.
No other power supply offers its combination of performance and convenience.
Digital control gives greatly increased stability, resolution and accuracy.
The advanced user interface provides
fast, simple and foolproof operation.
Optimised all-linear regulation gives very
low noise and excellent dynamics.
Multiple ranges provide greater flexibility in
the choice of voltage and current.
A wealth of convenience features are
available at the touch of a button.
Optional bus interfaces offer high performance remote control operation.
u
Advanced dc power supply range, single or triple output
u
Very high precision, very low noise, excellent dynamics
u
Advanced user interface with numeric and rotary control
u
Multiple voltage/current ranges for increased flexibility
u
Multiple non-volatile memories for power supply set-ups
u
Switchable remote sense provides perfect load regulation
u
Comprehensive protection including OVP and OCP trips
u
Compact bench footprint; modular width for rack mounting
u
Auxiliary output of 5.0V, 3.3V or 2.7V (QL355T and TP)
u
Bus programmable via GPIB, RS-232 or USB (P models)
u
Duplicate power and sense terminals at rear (P models)
QL output noise versus typical bench PSU
You need the ability to define a precise
voltage at the load and maintain regulation
independent of lead resistances.
Technical Specifications
Side Views
Rear Panel Connections
Selectable local or remote sensing
Voltage Setting:
By floating point numeric entry or rotary jog wheel;
resolution 1mV.
Current Setting:
By floating point numeric entry or rotary jog wheel;
resolution 1mA or 0.1mA depending on range.
Setting Accuracy:
Voltage - 0.03% ±5mV. Current 0.2% ±5mA/0.5mA
Output Mode:
Operation in constant voltage or constant current modes
with automatic cross-over and mode indication by LEDs.
DC Output Switch:
Sets output voltage and current levels to zero when Off.
Output Terminals:
4mm terminals on 19mm (0.75") spacing.
Duplicate terminals on rear tag strip (P versions only)
Load Regulation:
<0.01% of maximum output for 50% load change
Line Regulation:
<0.01% of maximum output for 10% line voltage change
Ripple and Noise:
Typically <0.35mV rms
Transient Response: <20usec to within 15mV of setting for 90% load change
o
TempCo:
<±(50ppm+0.5mV)/ C (voltage)
Remote Sense:
Eliminates up to 0.5V drop per lead. Remote sense operation selected from front panel and indicated by LED.
Sense Terminals:
Recessed sprung sockets for direct insertion of wires
Duplicate terminals on rear tag strip (P versions only).
OUTPUT PROTECTION
Output Protection:
Output will withstand forward voltages of up to 20V above rated
output voltage. Reverse protection by diode clamp for currents
up to 3A..
Fault Condition Trip: The output will be shut down if any of the four trip conditions
listed below occur. In addition to the output being set to Off, an
isolated rear panel signal is also activated.
Over Voltage (OVP): Settable 1V to 40V (QL355) or 62V (QL564) in 0.1V steps
Over Current (OCP): Settable 0.1A to 5.5A (QL355) or 4.4A (QL564) in 0.01A steps
Over Temperature: Monitors internal temperature rise to protect against excess
ambient temperature or blocked ventilation slots.
Sense Error:
Monitors the voltage between the remote sense terminals and
output terminals to protect against mis-wiring.
Trip Output Signal: Isolated open-collector output signal on rear panel.
METERING
Duplicate Output
Terminals
(P models only)
u What about complexity ?
The QL series can be as simple or as
sophisticated as you want it to be.
Setting voltage and current is as easy as
using a calculator. Or select Jog wheel
control and make all of your adjustments
using just the rotary knob.
When you don’t need the advanced features you don’t have to use them.
However, we believe that you’ll soon find
many of the capabilities too useful to ignore.
Alarm
Output
GPIB (IEEE-488) Interface
(P models only)
RS-232 Interface
(P models only)
IEC Power Inlet
USB Interface
(P models only)
u How much extra am I paying ?
Surprisingly little.
Despite its wealth of features, a QL series
PSU costs little more than a conventional
bench power supply of good quality.
Unlike offerings from some other
manufacturers, you can choose to buy it
without the bus interface, thus saving
money in the many situations where remote control is not required.
QL355, QL355P, QL355T, QL355TP
Max. Output Power: 105 watts
Output Ranges:
Range 1 - 0 to 35V, 0 to 3A
Range 2 - 0 to 15V, 0 to 5A
Range 3 - 0 to 35V, 0 to 500.0mA
QL564, QL564P
Max. Output Power: 112 watts
Output Ranges:
Range 1 - 0 to 56V, 0 to 2A
Range 2 - 0 to 25V, 0 to 4A
Range 3 - 0 to 56V, 0 to 500.0mA
MODEL O/Ps Max V / Max A Max. O/P
Bus
Rear
Size (mm) *
Weight Input
(see specs.)
Power Interfaces Terminals
WxHxD
(kg) VA max.
QL355
1
35V / 5A
105W
No
No
140 x 160 x 290
5.4
250
QL355P
1
35V / 5A
105W
Yes
Yes
140 x 160 x 290
5.5
250
QL564
1
56V / 4A
112W
No
No
140 x 160 x 290
5.4
250
QL564P
1
56V / 4A
112W
Yes
Yes
140 x 160 x 290
5.5
250
QL355T
3
35V / 5A (x 2)
215W
No
No
280 x 160 x 290
10.5
500
plus auxilliary
QL355TP 3
35V / 5A (x 2)
215W
Yes
Yes
280 x 160 x 290
10.6
500
plus auxiliary
* Dimensions exclude feet and terminals
Display Type:
Dual digital meters per output using 14mm (0.56") high
brightness LEDs. 5 digit voltmeter, 4 digit current meter.
Reading rate 4 per second.
Meter Function:
Voltage meter shows set voltage when in CV mode and
measured voltage when in CI mode.
Current meter shows measured current when in CV mode
and set current when in CI mode.
Limits Display:
With the dc output switch set to Off, both meters show the
set values (i.e. the limits). With the output On, either the
voltage meter or current meter will show a measured value
(depending on the CV/CI mode). Pressing the Limits button
will provide a temporary display of the set values.
Watts (VxA) Display: The voltage meter can be made to show the instantaneous
calculated product of voltage and current. The value displayed is equal to the equivalent power at the moment when
the button is pressed and remains whilst the button is held.
Meter Resolution:
Voltage: 1mV (CV mode) or 10mV (CI mode)
Current: 1mA or 0.1mA depending on range
Power: 0.01W or 0.001W depending on range
Meter Accuracy:
Voltage: 0.05% of reading ±10 mV (CI mode)
Current: 0.2% of reading ± 0.005A or 0.5mA (CV mode)
Power: 0.3% of reading ± 0.05W or 0.005W
SETTINGS MEMORIES
Number of Stores:
Memory Type:
Parameters Stored:
Recall system:
10 (30 total on QL355T and TP) plus power-down store.
Non-volatile using EEPROM.
Range, Set volts, Set current, OVP, OCP.
Settings are previewed onto the displays before being
actioned.
LINK & COPY - QL355T & TP
Each output can be controlled independently or can be linked. When linked, keyboard and jog wheel control operates on both outputs simultaneously.
Linked mode can be used to create tracking outputs, or for convenient series or
parallel operation of the two outputs.
A Copy function is available which copies all of the settings for output one to output two (Range, Set volts, Set current, OVP, OCP).
Linked mode can also be used to store the settings for both outputs to a group of
common memory stores when simultaneous recall is required.
(Note: Linked mode can be selected with differing voltage and current settings on
the two outputs. However both outputs must be set to the same range.)
THURLBY THANDAR INSTRUMENTS
QL Series
AUXILIARY OUTPUT - QL355T & TP
Output Voltage:
Output Current:
DC Output Switch:
Output Terminals:
Output Protection:
Load Regulation:
Line Regulation:
Switchable as 2.7V, 3.3V or 5.0V. Accuracy ±1%.
>1.0 A maximum. LED indication of over-current.
Sets output voltage level to zero when Off.
4mm terminals on 19mm (0.75") spacing.
Duplicate terminals at rear (P versions only)
Output will withstand up to 16 V forward voltage. Diode
clamped for reverse voltages and 3 Amps reverse current.
< 0. 2% for 50% load change.
< 0. 1% for 10% line change.
BUS INTERFACES (P Suffix versions)
USB:
Supplied with device driver for Win98 or above.
Operates as a virtual COM port.
RS-232:
Variable baud rate 19,200 max. Single instrument or
Addressable RS232 Chain (ARC) system.
GPIB:
Conforming with IEEE-488.1 and IEEE-488.2
N.B. All three interfaces incorporate full control, readback and status reporting.
Bus Type Selection: From front panel (GPIB/RS232/USB).
Address Selection: From front panel (1 to 31).
Baud Selection:
RS-232 only. From front panel (600 to 19200 baud).
Setting Resolution: Voltage - 1mV, Current 0.1mA (0.01mA on 500mA range).
Readback Resolution: Voltage - 10mV, Current 1mA (0.1mA on 500mA range).
Accuracy:
See specifications under Outputs and Metering.
Remote Command Response Time:
Interface:
<80 ms (command processing time).
Output Voltage :
Response time varies with range and load conditions.
Typical time to settle to within 1% of the total excursion on a
35V/3A range with full load is <25ms. With no load it is
<7 ms for an upward change and <600ms for downward.
GENERAL
Power Requirements: 230V or 115V ± 14% (internally adjustable).
Installation category 11. See table for VA rating.
o
o
Environmental:
Operating Range: 5 C to 40 C, 20% to 80% RH
o
o
Storage Range: -20 C to +60 C
Size and Weight:
See Table
Electrical Safety:
Designed and manufactured to comply with IEC1010-1.
Full safety sockets available to special order.
EMC:
Designed and manufactured to comply with EN61326.
Benchtop Operation: Folding legs are incorporated that can be used to angle the
front panel upwards when required.
Rack Mount Option: 19 inch 4U mount for up to three single output units or one
triple plus one single. Blanking plates are available for unused sections.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development
and reserves the right to alter specifications without prior notice. Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Precision laboratory dc power supplies
advanced user interface gives superior control
multiple output ranges provides greater flexibility
series includes single and triple output versions
full bus programmability via GPIB, RS232 or USB
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE29 7DR England (UK)
Tel: (0)1480 412451 Fax: (0)1480 450409
Web: www.tti-test.com Email: [email protected]
82100-10XX
QL series precision dc power supplies
the ultimate in laboratory power !
Questions & Answers
u Why do I need a precision PSU ?
Every engineer needs to have confidence
in their equipment. A power supply is one
of the most fundamental of bench
instruments.
You need certainty that the voltage you apply to a circuit is precisely what you want it
to be.
1mV resolution right up to maximum output
You need certainty that the output of your
power supply is clean and stable.
MAIN OUTPUT(S)
QL series - digitally controlled precision
The QL series represents the ultimate in
laboratory power.
No other power supply offers its combination of performance and convenience.
Digital control gives greatly increased stability, resolution and accuracy.
The advanced user interface provides
fast, simple and foolproof operation.
Optimised all-linear regulation gives very
low noise and excellent dynamics.
Multiple ranges provide greater flexibility in
the choice of voltage and current.
A wealth of convenience features are
available at the touch of a button.
Optional bus interfaces offer high performance remote control operation.
u
Advanced dc power supply range, single or triple output
u
Very high precision, very low noise, excellent dynamics
u
Advanced user interface with numeric and rotary control
u
Multiple voltage/current ranges for increased flexibility
u
Multiple non-volatile memories for power supply set-ups
u
Switchable remote sense provides perfect load regulation
u
Comprehensive protection including OVP and OCP trips
QL output noise versus typical bench PSU
You need the ability to define a precise
voltage at the load and maintain regulation
independent of lead resistances.
Technical Specifications
u
Compact bench footprint; modular width for rack mounting
u
Auxiliary output of 5.0V, 3.3V or 2.7V (QL355T and TP)
u
Bus programmable via GPIB, RS-232 or USB (P models)
u
Duplicate power and sense terminals at rear (P models)
Side Views
Rear Panel Connections
Selectable local or remote sensing
Duplicate Output
Terminals
(P models only)
u What about complexity ?
The QL series can be as simple or as
sophisticated as you want it to be.
Setting voltage and current is as easy as
using a calculator. Or select Jog wheel
control and make all of your adjustments
using just the rotary knob.
When you don’t need the advanced features you don’t have to use them.
However, we believe that you’ll soon find
many of the capabilities much too useful to
ignore.
RS-232 Interface
(P models only)
IEC Power Inlet
USB Interface
(P models only)
MODEL O/Ps Max V / Max A Max. O/P
Bus
Rear
Size (mm) *
Weight Input
(see specs.)
Power Interfaces Terminals
WxHxD
(kg) VA max.
QL355
1
35V / 5A
105W
No
No
140 x 160 x 290
5.4
250
QL355P
1
35V / 5A
105W
Yes
Yes
140 x 160 x 290
5.5
250
QL564
1
56V / 4A
112W
No
No
140 x 160 x 290
5.4
250
QL564P
1
56V / 4A
112W
Yes
Yes
140 x 160 x 290
5.5
250
QL355T
3
35V / 5A (x 2)
215W
No
No
280 x 160 x 290
10.5
500
plus auxiliary
QL355TP 3
35V / 5A (x 2)
215W
Yes
Yes
280 x 160 x 290
10.6
500
plus auxiliary
* Dimensions exclude feet and terminals
Number of Stores:
Memory Type:
Parameters Stored:
Recall system:
10 (30 total on QL355T and TP) plus power-down store.
Non-volatile using EEPROM.
Range, Set volts, Set current, OVP, OCP.
Settings are previewed onto the displays before being
actioned.
LINK & COPY - QL355T & TP
Each output can be controlled independently or can be linked. When linked, keyboard and jog wheel control operates on both outputs simultaneously.
Linked mode can be used to create tracking outputs, or for convenient series or
parallel operation of the two outputs.
A Copy function is available which copies all of the settings for output 1 to output
2 (Range, Set volts, Set current, OVP, OCP).
Linked mode can also be used to store the settings for both outputs to a group of
common memory stores when simultaneous recall is required.
(Note: Linked mode can be selected with differing voltage and current settings on
the two outputs. However both outputs must be set to the same range.)
THURLBY THANDAR INSTRUMENTS
QL Series
AUXILIARY OUTPUT - QL355T & TP
Output Voltage:
Output Current:
DC Output Switch:
Output Terminals:
Output Protection:
Load Regulation:
Line Regulation:
Switchable 2.7V, 3.3V or 5.0V. Accuracy better than ±5%.
>1.0 A maximum. LED indication of over-current.
Sets output voltage level to zero when Off.
4mm terminals on 19mm (0.75") spacing.
Duplicate terminals at rear (P versions only)
Output will withstand up to 16 V forward voltage. Diode
clamped for reverse voltages and 3 Amps reverse current.
< 1% for 90% load change.
< 0. 1% for 10% line change.
BUS INTERFACES (P Suffix versions)
OUTPUT PROTECTION
Output Protection:
Output will withstand forward voltages of up to 20V above rated
output voltage. Reverse protection by diode clamp for currents
up to 3A..
Fault Condition Trip: The output will be shut down if any of the four trip conditions
listed below occur. In addition to the output being set to Off, an
isolated rear panel signal is also activated.
Over Voltage (OVP): Settable 1V to 40V (QL355) or 62V (QL564) in 0.1V steps
Over Current (OCP): Settable 0.1A to 5.5A (QL355) or 4.4A (QL564) in 0.01A steps
Over Temperature: Monitors internal temperature rise to protect against excess
ambient temperature or blocked ventilation slots.
Sense Error:
Monitors the voltage between the remote sense terminals and
output terminals to protect against mis-wiring.
Trip Output Signal: Isolated open-collector output signal on rear panel.
METERING
Display Type:
GPIB (IEEE-488) Interface
(P models only)
u How much extra am I paying ?
Surprisingly little.
Despite its wealth of features, a QL series
PSU costs little more than a conventional
bench power supply of good quality.
Unlike offerings from some other
manufacturers, you can choose to buy it
without the bus interface, thus saving
money in the many situations where remote control is not required.
Alarm
Output
QL355, QL355P, QL355T, QL355TP
Max. Output Power: 105 watts
Output Ranges:
Range 1 - 0 to 35V, 0 to 3A
Range 2 - 0 to 15V, 0 to 5A
Range 3 - 0 to 35V, 0 to 500.0mA
QL564, QL564P
Max. Output Power: 112 watts
Output Ranges:
Range 1 - 0 to 56V, 0 to 2A
Range 2 - 0 to 25V, 0 to 4A
Range 3 - 0 to 56V, 0 to 500.0mA
All Models
Voltage Setting:
By floating point numeric entry or rotary jog wheel;
resolution 1mV.
Current Setting:
By floating point numeric entry or rotary jog wheel;
resolution 1mA or 0.1mA depending on range.
Setting Accuracy:
Voltage - 0.03% ±5mV. Current 0.2% ±5mA/0.5mA
Output Mode:
Operation in constant voltage or constant current modes
with automatic cross-over and mode indication by LEDs.
DC Output Switch:
Sets output voltage and current levels to zero when Off.
Output Terminals:
4mm terminals on 19mm (0.75") spacing.
Duplicated on rear terminal block (P versions only)
Load Regulation:
<0.01% of maximum output for 50% load change
Line Regulation:
<0.01% of maximum output for 10% line voltage change
Ripple and Noise:
Typically <0.35mV rms CV mode, and <0.2mA rms CI mode
(<20µA rms on 500mA range)
Transient Response: <20usec to within 15mV of setting for 90% load change
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Temperature Coeff.: <±(50ppm+0.5mV)/ C (voltage)
Remote Sense:
Eliminates up to 0.5V drop per lead. Remote sense operation selected from front panel and indicated by LED
Sense Terminals:
Recessed sprung sockets for direct insertion of wires
Duplicated on rear terminal block (P versions only)
SETTINGS MEMORIES
Dual digital displays per output using 14mm (0.56") high
brightness LEDs. 5 digits for voltage, 4 digits for current.
Update rate 4 per second.
Meter Function:
Voltage meter shows set voltage when in CV mode and
measured voltage when in CI mode.
Current meter shows measured current when in CV mode
and set current when in CI mode.
Limits Display:
With the dc output switch set to Off, both meters show the
set values (i.e. the limits). With the output On, either the
voltage meter or current meter will show a measured value
(depending on the CV/CI mode). Pressing the Limits button
will provide a temporary display of the set values.
Watts (VxA) Display: The voltage meter can be made to show the instantaneous
calculated product of voltage and current. The value displayed is equal to the equivalent power at the moment when
the button is pressed and remains whilst the button is held.
Meter Resolution:
Voltage: 1mV (CV mode) or 10mV (CI mode)
Current: 1mA or 0.1mA depending on range
Power: 0.01W or 0.001W depending on range
Meter Accuracy:
Voltage: 0.1% of reading ±10 mV (CI mode)
Current: 0.2% of reading ± 0.005A or 0.5mA (CV mode)
Power: 0.3% of reading ± 0.05W or 0.005W
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
USB:
Standard USB harware connection. Supplied with device
driver for Win98 or above. Operates as a virtual COM port.
RS-232:
Variable baud rate 19,200 max. Single instrument or
Addressable RS232 Chain (ARC) system.
GPIB:
Conforming with IEEE-488.1 and IEEE-488.2
N.B. All three interfaces incorporate full control, readback and status reporting.
Bus Type Selection: From front panel (GPIB/RS232/USB).
Address Selection: From front panel (1 to 31).
Baud Selection:
RS-232 only. From front panel (600 to 19200 baud).
Setting Resolution: Voltage - 1mV, Current 0.1mA (0.01mA on 500mA range).
Readback Resolution: Voltage - 10mV, Current 1mA (0.1mA on 500mA range).
Accuracy:
See specifications under Outputs and Metering.
Remote Command Response Time:
Interface:
<80 ms (command processing time).
Output Voltage :
Response time varies with range and load conditions.
Typical time to settle to within 1% of the total excursion on a
35V/3A range with full load is <25ms. With no load it is
<7 ms for an upward change and <600ms for downward.
GENERAL
Power Requirements: 230V or 115V ± 10% (internally adjustable).
Installation category II. See table for VA rating.
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Environmental:
Operating Range: 5 C to 40 C, 20% to 80% RH
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Storage Range: -40 C to +70 C
Size and Weight:
See Table
Electrical Safety:
Designed and manufactured to comply with IEC1010-1.
EMC:
Designed and manufactured to comply with EN61326.
Benchtop Operation: Folding legs are incorporated that can be used to angle the
front panel upwards when required.
Rack Mount Option: 19 inch 4U mount for up to three single output units or one
triple plus one single. Blanking plates are available for unused sections.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development
and reserves the right to alter specifications without prior notice. Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Precision laboratory dc linear power supplies
unrivalled accuracy, resolution, stability & noise
advanced user interface gives superior control
multiple output ranges provide greater flexibility
full bus programmability via GPIB, RS232 or USB
Ihr Partner für die Meßtechnik
ALLICE Messtechnik GmbH
Technik- und Logistik-Center
60528 Frankfurt, Kelsterbacher Str. 15
www.allice.de
Tel.: 069-677 24583
[email protected]
Fax: 069-677 24582
82100-1190