3 Performance Verification
70 Keysight DAQ970A/DAQ973A Service Guide
Gain Verification
This procedure is used to check the “full scale” reading accuracy of the internal
DMM. Verification checks are performed only for those functions and ranges with
unique gain calibration constants. Measurements are checked for each function
and range as described in the procedure below:
DC voltage, ohms, and DC current gain verification
1 Ensure that you have read the “Test Considerations” on page 47.
2 This procedure will measure the input signal from the Fluke calibrator source
connected to Channel 302 (DC voltage, 2-wire ohms), 312 (4-wire ohms), and
321 (DC current). See the connections in “Input test signal” on page 38.
3 Configure each function and range to the respective channel in the order
shown in following tables. Enable Channel Monitor on the selected channel
before each test (see “Channel monitor” on page 50).
4 Apply the input values and allow for appropriate source settling and compare
the measurement results to the appropriate test limits.
5 Repeat step 4 for each gain verification item.
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