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SP 200
3½ Digit Backlit LCD Voltmeter Module
PRODUCT DESCRIPTION
The SP 200 features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user
selectable. The SP 200 features a negative rail generator which enables the meter to measure a signal referenced to its
own power supply GND. LED backlighting ensures excellent readability under low light conditions. The module is
easily fitted into the panel, using the fixing clip provided. The module's low cost means it will suit high and low volume
applications. The design of the panel meter's housing ensures splash proofing using the supplied seal.
FEATURES
• 9.75mm (0.38") Digit Height
• 200mV d.c. Full Scale Reading
• 350µA @ +5V d.c. Power Supply
• Auto-zero and Auto-polarity
• Programmable Decimal Points
• LED Backlighting
• Low Battery Warning
• Splash Proof
TYPICAL APPLICATIONS
ORDERING INFORMATION
• Precision Instrumentation Systems
• Power Supply Monitoring
• Test Boxes
• Panel-Mount Indication
• Low Power Voltage Measurement
Stock Number
SP 200
Standard Meter
ELECTRICAL SPECIFICATIONS
Specification
Min.
Accuracy (overall error) *
Linearity
Sample rate
Operating temperature range
Temperature stability
Supply voltage
Supply current
Backlight current @ 5V d.c.
Input leakage current (Vin = 0V)
0
3.5
Typ.
0.1
2.5
100
5
350
40
1
Max.
±1
50
5.25
80
10
Unit
% (±1 count)
count
samples/sec
°C
ppm/°C
V
µA
mA
pA
* To ensure maximum accuracy, re-calibrate periodically.
SAFETY
To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed
60Vdc. The user must ensure that the incorporation of the panel meter into the user’s equipment conforms to the
relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and
Laboratory Use).
LASCAR ELECTRONICS LTD.
MODULE HOUSE
WHITEPARISH
WILTSHIRE SP5 2SJ
UK
TEL: +44 (1794) 884567
FAX: +44 (1794) 884616
E-mail: [email protected]
LASCAR ELECTRONICS INC.
PO BOX 50727
PALO ALTO
CA 94303-0727
USA
TEL: +1 (650) 838 9027
FAX: +1 (650) 833 5432
E-mail: [email protected]
www.lascarelectronics.com
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. BLDG.
63-65 HUNG TO ROAD
KWUN TONG
KOWLOON
HONG KONG
TEL: +852 2797 3219
FAX: +852 2343 6187
E-mail: [email protected]
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SP 200
3½ Digit Backlit LCD Voltmeter Module
DIMENSIONS
All dimensions in mm (inches)
a
34 (1.34
)
b
c
20.5 (0.81)
21.3 (0.84)
22.4 (0.88)
27.9 (1.10)
d
33.0 (1.30)
a. 0.75 (0.03)
b. 10.00 (0.39)
c. 6.00 (0.24)
d. 2.54 (0.10)
35.0 (1
.38)
Panel thickness: 1.0 - 3.0
(0.04 - 0.12)
PANEL FITTING
Panel
Module
Seal
Fixing Clip
1
2
3
FUNCTIONAL BLOCK DIAGRAM
4
PIN CONFIGURATION
(rear view)
V+
RO
Vref
12
CAL
COM
BL
RI
INH
INL
+
_
7
A/D
V+
NC
GND
DP3
DP2
DP1
1
6
8
1
GND
INL
INH
COM
BL
RO
CAL
RI
DP1 2 3
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SP 200
3½ Digit Backlit LCD Voltmeter Module
CIRCUIT DIAGRAM
1
2
11
12
6
10
7
5
3
4
8
9
PIN FUNCTIONS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
V+
NC
GND
DP3
DP2
DP1
RI
RO
BL
COM
11. IH
12. IL
Positive power supply to the meter and LED backlighting.
Not connected.
0V power supply connection to the meter.
Connect to GND to display DP3 (199.9).
Connect to GND to display DP2 (19.99).
Connect to GND to display DP1 (1.999).
Reference voltage input for the meter's A/D converter.
Precision reference voltage output. Connect to RI for normal operation.
Connect to GND to switch on the LED backlighting.
Ground for analogue section of A/D converter.
It is actively held at 2.8V below V+ and must not be allowed to sink excessive current
(>100µA) by, for instance, connecting to a higher voltage.
Positive measuring input.
IH must be no closer than 1.5V to either the positive or negative supply.
Negative measuring input.
IL must be no closer than 1.5V to the positive supply.
Note:
A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, then
the internally generated V- is -5V. When measuring with the input referenced to the same supply rail as
that of the panel meter, then the limitations on the input range are (V- + 1.5V) to (V+ - 1.5V).
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Page 3 of 4
SP 200
3½ Digit Backlit LCD Voltmeter Module
SCALING
Two resistors Ra and Rb
may be used to alter the
full scale reading (FSR) of
the meter - see table. The
meter will have to be recalibrated by adjusting the
calibration potentiometer
on the rear of the module.
FSR
2V
20V
200V
2000V*
200µA
2mA
20mA
200mA
Voltage
Vin
Current
Iin
Ra
910k
1M
1M
1M
0R
0R
0R
0R
Rb
100k
10k
1k
100R
1k
100R
10R
1R
Ra
+
11
Vin or Iin
INH
SP 200
Rb
-
12
INL
*Ensure that Ra is rated for high voltage use.
APPLICATIONS
Do not connect more than one meter to the same power supply if the meters cannot use the same signal
ground. Taking any input beyond the power supply rails will damage the meter.
1
V+
V+
+
11
-
11
+
RO
RI
12
8
INH
RO
±200mV
7
12
-
INL
10
Vsupply
0V
V+
11
INL
COM
INH
RO
8
RI
7
GND
R= Reading at 20mA
160
3
0V
Measuring a 4-20mA loop current.
The meter's power supply must be isolated
from the 4-20mA current loop.
I
Ra=1M
1
470nF
0V
12
R
I+
Measuring an input voltage referenced to
a floating supply, i.e. the input voltage
and the meter's power supply are isolated
from each other.
+5V
10uF
220nF
4-20mA
1
V+
10
I-
7
COM
3
Set Zero
5k
8
GND
Measuring a single ended input
voltage referenced to supply, i.e. the
input voltage and the meter's power
supply share the same 0V rail.
7805
RI
INL
GND
3
220k
V+
INH
±200mV
V+
1
V+
10
COM
8
RO
7
RI
INH
11
INL
12
V
Load
S1 A
GND
Rb=1k
S1 selects between voltage and current display.
Ra and Rb shown scaled for 200VFSR.
Rs = 200mV (e.g. 0.1Ω for 2A range)
I
Rs
3
RL
Shunt
Measuring supply voltage and current to a load.
Display DP1, DP2 or DP3 by connecting to GND, as required.
Specifications liable to change without prior warning
SP 200
Issue 3
October/2001
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M.C.
Applies to SP 200/1
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