Download Lab 4 Pressure Calibration Agilent Version 1.0

Lab 4 Pressure Calibration with Agilent 34972A
1.
Connect the Pressure Transducer and Excitation Voltage to the Agilent 34972A Data Logger.
The Red and Black wires from the power supply have 10 VDC for the Excitation Voltage and connect
to a terminal strip.
a) Remove the 34901A 20 Channel Multiplexer with screw terminal connectors from slot 100 (top)
on the back of the Agilent 34972A Data Logger. Remove the lid, works best if from below you
use a screw driver as a lever to move the tab in the direction of the arrow on the cover, and lift the
cover.
DO NOT FORCE THE SCREWS! To insert a wire in the connection:
1. Turn the screw counter clockwise, this will lower a small plate that grips the wire.
Note: the plate may already be in the lowest position, do not use force!
2. When the plate is low enough to insert the wire, insert the wire above the plate.
3. Turn the screw clockwise to raise the plate and grip the wire, keep the wire inserted
until the plate grips it. DO NOT USE EXCESSIVE FORCE!
b) Connect the Red wire from the terminal strip that connects to both the power supply and the
Pressure Transducer to the Data Logger Channel 2 High.
c) Connect the Black wire from the terminal strip that connects to both the power supply and the
Pressure Transducer to the Data Logger Channel 2 Low.
The Green and White wires from the Pressure Transducer have the output voltage signal.
d) Connect the Green wire from the terminal strip that connects to the Pressure Transducer to the
Data Logger Channel 1 High
e) Connect the White wire from the terminal strip that connects to the Pressure Transducer to the
Data Logger Channel 1 Low.
f) Pull gently on the wires to double check that they are being held securely, do not use force!
g) Install the lid, and then insert the 34901A Multiplexer back into the back of the Agilent 34972A data
logger in the top slot # 100.
2.
Use the Spreadsheet “Lab 4 Pressure Calibration Agilent Version 1.0”. Be sure the power supply is
on and the 34972A is connected to the PC.
a) Look at (but don’t change) the sheet “Timed1”. It should show on row 14 in columns C and E “DC
Volts 100 PLC”. The data logger will sample for 100 Power Line Cycles the DC Voltage on
Channel 101 and the DC Voltage on Channel 102. Rows 14 and 15 columns D and F have the
commands used to setup the data logger. Channel 101 is the first channel on the top card.
b) You will use the sheet “Data”. You will want to record the "True Pressure” (weights) and the
Bourdon tube pressure as you go along.
c) To have the computer take the pressure transducer voltages:
1)
Select a cell in the row you want the new readings to be written to, the readings will go in
the correct columns under the channel numbers.
2)
Press the “Do One Scan Now” button to take the data with the Data Logger.
3.
Divide the Pressure Transducer output voltage by the Excitation Voltage to get a
nondimensionalized voltage. For Task #3 plot the transducer calibration data in terms of a True
Pressure (y axis) verses nondimensional voltage (x axis) graph.
4.
When you are through, disconnect the wires from the Agilent 34972A Data Logger, and turn off
the power supply.
5.
When you are through, turn the Dead Weight Tester plunger all the way out to the stop, 0 psi.
This will depressurize the piston, preventing the tester from leaking/dripping oil.