Calibration Procedures 2
Keysight DAQ970A/DAQ973A Service Guide 61
7 A “Calibration Step Succeeded” message indicates success; if the display
shows “Calibration Step Failed”, check the input value, range, function, and
entered calibration value, and repeat the calibration step.
8 Repeat step 5 to step 7 for each gain calibration point.
9 Store the new gain calibration constants (see “Storing calibration constants”
on page 46).
Ohms gain calibration (2-wire and 4-wire)
1 Ensure that you have read the “Test Considerations” on page 47 and the “Gain
and flatness adjustment considerations” on page 55.
2 Ensure that you follow the sequence listed in the “Calibration Adjustment
Sequence” on page 51.
3 This procedure will measure and adjust the input signal from the calibrator
source connected to Channel 302 (Ohms). See the connections in “Input test
signal” on page 38.
4 Select Channel 302 and configure the function in the order shown in the table
below and enable Channel Monitor on the selected channel before each test
(see “Channel monitor” on page 50).
5 Apply the input resistance per the input column in Table 2-6 and allow for
appropriate source settling.
6 Enter the calibration value per the applied input current in step 5 and press
Perform Cal Step to begin the adjustment procedure (see “Entering calibration
values” on page 46).
Table 2-5 DC voltage gain calibration (~10 V)
Input Channel 302
Voltage Function Range NPLC
10 V
DC voltage
10 V
10
–10 V
100 mV
100 mV
–100 mV
1 V 1 V
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