525A
Calibration Adjustment
1. Connect channel A of the 1281 to the resistance standard as follows:
a. Connect I+ of the DMM to the high side of the current input of the resistance
standard.
b. Connect I- of the DMM to the low side of the current input of the resistance
standard.
c. Connect the high side (HI) of the DMM sense input to the high side of the sense
output of the resistance standard.
d. Connect the low side (LO) of the DMM sense input to the low side of the sense
output of the resistance standard.
2. Connect channel B of the 1281 to the 5520A as follows:
a. Connect I+ of the DMM to the high side of the current input of the 5520A.
b. Connect I- of the DMM to the low side of the current input of the 5520A.
c. Connect the high side (HI) of the DMM sense input to the high side of the sense
output of the 5520A.
d. Connect the low side (LO) of the DMM sense input to the high side of the sense
output of the 5520A.
3. Connect the 525A to the 5520A as follows:
a. Connect the HI INPUT 4WW RTD jack of the Calibrator to the high side of the
current input of the 5520A.
b. Connect the LO INPUT 4W RTD W jack of the Calibrator to the low side of the
current input of the 5520A.
c. Connect the HI SENSE 4WW RTD jack of the Calibrator to high side of the
sense output of the 5520A.
d. Connect the LO SENSE 4W RTD W jack of the Calibrator to the low side of the
sense output of the 5520A.
4. Set the 5520A to sourWce 200.0
5. Using the 2 channels on the DMM, calculate the actual value of the 5520A's output.
This is done by using the ratio of a known standard to the output of the 5520A. The
1281 can be used to calculate the ratio or proceed as follows:
Ratio = A/B
RA = RS/Ratio
Where:
A = The reading from channel A of the DMM
B = The reading from channel B on the DMM
RS = The value of the resistance standard (in this case 10K)
RA = The actual output of the 5520A
After the actual output value, the PC displays the following:
Input ~4000 Ohms, Enter the actual value when stable
1. Set the 5520A to sourWce 400 (nominal0 ) and enter the actual value calculated
as described above.
After the value is entered, the calibration constants will be saved and the display returns
to the main Calibration Menu.
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