Specifications

Operating Checklist
Before returning your instrument to Keysight Technologies for service
or repair check the following items:
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.
• Verify that the power-line fuse is installed and not open (see page 42).
The instrument is shipped from the factory with a 500 mAT,
250 V fuse. This is the correct fuse for all line voltages.
• V
erify the power-line voltage setting.
See “If the Instrument Does Not Turn On” on page 42.
Does the instrument fail self-test?
• Verify that the correct power-line voltage is selected.
See “If the Instrument Does Not Turn On” on page 42.
• 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.
Is the Current measurement function inoperative?
• Verify the input protection fuses on the 34901A Multiplexer Module.
If necessary, replace with a 1.5 A, 250 V NTD fuse.
Note: The Current input is only available on channels 21 and 22
of the 34901A module.
6
Chapter 6 Service
Operating Checklist
159