3 Performance Verification
68 Keysight DAQ970A/DAQ973A Service Guide
Internal DMM Verification Tests
These procedures use inputs connected to a DAQM901A multiplexer module
installed in slot 300. For more information, see “Input Connections” on page 37.
Zero Offset Verification
This procedure is used to check the zero offset performance of the internal DMM.
Verification checks are only performed for those functions and ranges with unique
offset calibration constants. Measurements are checked for each function and
range as described in the procedure below:
1 Ensure that you have read the “Test Considerations” on page 47.
2 This procedure will measure the shorts installed on Channels 303 and 313.
Leave the amps input connections (Channel 321) open. See the connections in
“Short (Zero)” on page 37.
3 Select each function and range in the order shown in following table. Enable
Channel Monitor on the selected channel before each test (see “Channel
monitor” on page 50).
4 Compare the measurement results to the appropriate test limits.
NOTE
Zero offset calibration using a multifunction calibration is NOT recommended.
The calibrator and cabling offset can be large and unstable causing poor offset
calibration of the internal DMM.
Input
Channel 303
Quick
check
[a]
Error from nominal
Function
[b]
Range 24 hours 90 days 1 year 2 years
Short DC voltage
100 mV Q ±5 μV ±6 μV ±6 μV ±6 μV
1 V ±6 μV ±6 μV ±6 μV ±6 μV
10 V ±30 μV ±40 μV ±40 μV ±40 μV
100 V ±600 μV ±600 μV ±600 μV ±600 μV
300 V ±6 mV ±6 mV ±6 mV ±6 mV
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