Fluke 52120A, Руководство пользователя

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52120A
Users Manual
5-16
Note
Start the connections with the 2 A current shunt.
4. On the rear panel of the Product, set the Calibration switch to Enable . See
Figure 5-3.
gpp016.eps
Figure 5-3. Calibration Enable Switch
How to Correct for Shunt Resistance Error
See the How to Use 8508A Math Functions to Simplify Error Corrections section above.
Use the 8508A math function variable ‘m’.
Adjustment Process
To start the adjustment procedure, you command the Product with a SCPI command
through the GPIB interface.
Send
:CAL:SEC:PASS “ADJUST”
to the Product through the GPIB interface.
Note
The password is used so you do not accidentally overwrite a calibration
constant. The password is case sensitive.
You can control the Product through the GPIB interface with remote commands, or push
L
on the front panel and use the front-panel keys.
You can learn more about the SCPI commands in Chapter 3.
In the procedure that follows, there are instructions for front-panel control on the Product.
The remote commands are contained in Chapter 3.
Adjustments Notes
Two parameters are necessary for each adjustment : measured value and target value.
•
Target value ( T ) is the usual value of the adjustment point in amps.
•
Measured value ( M ) is the value measured with the 8508A and A40B shunt when the
output is set to be the target value converted to amps.
•
For dc, the measured value is the average of the positive and negative measurements.
The Product output current is measured as a voltage. The voltage must be changed to a
current to use in the remote adjustment command. The 8508A 'z' store will hold the
corrected shunt resistance value and divide the reported voltage by 'z'. The measured
value in Amps is used in the adjustment command string. For example if the Target is 20
A and the measured value is 19.80000 A the adjustment command is:
CAL:ADJ? GAIN,20.0000,19.8000.
Adjustments
The adjustment steps that follow use the same sequence of steps for each range:
•
Connect the shunt applicable for the Product range as shown in Figure 5-2.
•
Set the Fluke 8508A to the 1 Volt dc range