Zero Adjustment; Zero And Adc Calibration - Keysight Technologies DAQ970A Service Manual

2 Calibration Procedures

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.
Never turn off the instrument during zero adjustment. This may cause ALL
NOTE
calibration memory to be lost.

Zero and ADC calibration

This zero and ADC adjustment procedure takes about 2 minutes to complete.
1 Ensure that you have read
2 Ensure that you follow the sequence listed in the
3 This procedure will use the copper shorts installed on Channels 303 and 313.
4 Select Channel 303 and configure the function to Ohms 4W, auto range, and
5 Enable Channel Monitor on the selected channel before each test (see
6 Enter a calibration value of +0 and press Perform Cal Step to begin the
7 The zero calibration lasts approximately 1 minute. A "Calibration Step
8 Press Perform ADC Cal to initiate the ADC calibration.
52
this test.
Sequence" on page 51.
Leave the amps input connections (Channel 321) open.
NPLC 10.
"Channel monitor" on page 50).
adjustment procedure (see
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.
"Test Considerations"
"Entering calibration values"
Keysight DAQ970A/DAQ973A Service Guide
on page 47 before beginning
"Calibration Adjustment
on page 46).