2 Calibration Procedures
52 Keysight DAQ970A/DAQ973A Service Guide
Zero Adjustment
Each time you perform a zero adjustment, the Internal DMM stores a new set of
offset correction constants for every measurement function and range. The
Internal DMM will sequence through all required functions and ranges
automatically and store new zero offset calibration constants. All offset
corrections are determined automatically. You may not correct a single range or
function without re-entering ALL zero offset correction constants automatically.
This feature is intended to save calibration time and improve zero calibration
consistency.
Zero and ADC calibration
This zero and ADC adjustment procedure takes about 2 minutes to complete.
1 Ensure that you have read “Test Considerations” on page 47 before beginning
this test.
2 Ensure that you follow the sequence listed in the “Calibration Adjustment
Sequence” on page 51.
3 This procedure will use the copper shorts installed on Channels 303 and 313.
Leave the amps input connections (Channel 321) open.
4 Select Channel 303 and configure the function to Ohms 4W, auto range, and
NPLC 10.
5 Enable Channel Monitor on the selected channel before each test (see
“Channel monitor” on page 50).
6 Enter a calibration value of +0 and press Perform Cal Step to begin the
adjustment procedure (see “Entering calibration values” on page 46).
7 The zero calibration lasts approximately 1 minute. 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 Press Perform ADC Cal to initiate the ADC calibration.
NOTE
Never turn off the instrument during zero adjustment. This may cause ALL
calibration memory to be lost.
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