3 Performance Verification
76 Keysight DAQ970A/DAQ973A Service Guide
Plug-in Module Test Considerations
For optimum performance, all test procedures should comply with the following
recommendations:
– Assure that the calibration ambient temperature is stable and between 18 °C
and 28 °C. Ideally the calibration should be performed at 23 °C ± 1 °C.
– Assure ambient relative humidity is less than 80%.
– Install the plug-in module and allow a 45 minute warm-up period before
verification or adjustment.
– Use shielded twisted pair PTFE insulated cables to reduce settling and noise
errors. Keep the input cables as short as possible.
– Remove all user wiring and connections from the plug-in modules before
verification or adjustment.
– Use 4-wire Ohms measurement techniques for checking relay contact
resistance. Check directly at the terminals where possible.
WARNING
TO PREVENT ELECTRICAL SHOCK
To prevent electrical shock, use only wire that is rated for the highest voltage
to any channel. Before removing a module cover, turn off all power to
external devices connected to the module.
WARNING
CAUTION WITH MULTIPLE SIGNALS
To avoid the possibility of multiple signal sources becoming connected
together, we recommend when multiplexing two or more sources they
should be connected on separate modules or on separate banks of the same
module.
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