Plug-In Module Test Considerations - Keysight Technologies DAQ970A Service Manual

3 Performance Verification

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
– Assure ambient relative humidity is less than 80%.
– Install the plug-in module and allow a 45 minute warm-up period before
– Use shielded twisted pair PTFE insulated cables to reduce settling and noise
– Remove all user wiring and connections from the plug-in modules before
– Use 4-wire Ohms measurement techniques for checking relay contact
TO PREVENT ELECTRICAL SHOCK
WARNING
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.
CAUTION WITH MULTIPLE SIGNALS
WARNING
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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and 28 °C. Ideally the calibration should be performed at 23 °C ± 1 °C.
verification or adjustment.
errors. Keep the input cables as short as possible.
verification or adjustment.
resistance. Check directly at the terminals where possible.
Keysight DAQ970A/DAQ973A Service Guide