Service and Repair 1
Keysight DAQ970A/DAQ973A Service Guide 21
Troubleshooting
Operating checklist
Before returning your instrument to Keysight Technologies for service or repair,
check the following items:
1 Is the instrument inoperative?
– Verify that the AC power cord is connected to the instrument.
– Verify that the front panel [On/Standby] switch has been pushed.
2 Does the instrument fail its self-test?
– Remove all input connections to the instrument. Errors may be induced by
AC signals present on the input wiring during a self-test. Long test leads
can act as an antenna causing pick-up of AC signals.
3 Is the Current measurement function inoperative?
– Verify the input protection fuses on the DAQM901A multiplexer module. If
necessary, replace with a 1.6 A, 250 V, fast acting, cartridge body, and
5.2 x 20 mm fuse.
– Note that the current input is only available on Channels 21 and 22 of the
DAQM901A multiplexer module.
General troubleshooting hints
This section provides a brief check list of common failures. Before troubleshooting
or repairing the instrument, make sure the failure is in the instrument rather than
any external connections. Also make sure that the instrument is accurately
calibrated within the last year (see Chapter 2, “Calibration Procedures”). The
instrument’s circuits allow troubleshooting and repair with basic equipment such
as a 6½-digit multimeter.
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