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68 34980A User’s Guide
2 Features and Functions
Real-Time System Clock
During a scan, the instrument stores all readings and alarms with the
current time and date (based on a 24- hour clock).
• When shipped from the factory, the instrument is set to the current
time and date for Greenwich Mean Time (GMT).
• The clock setting is stored in non- volatile memory, and does not change
when power has been off, after a Factory Reset (
*RST command),
or after an Instrument Preset (SYSTem:PRESet command).
Front Panel Operation: Utility > DATE/TIME
Remote Interface Operation: The following commands show how to set the
time and date.
Relay Cycle Count
The instrument has a Relay Maintenance System to help you predict relay
end-of-life. The instrument counts the cycles on each relay in the
instrument and stores the total count in non-volatile memory on each
relay module. You can use this feature on any of the relay modules and
the internal DMM.
• In addition to the channel relays, you can also query the count on the
Analog Bus relays and bank relays.
• You can query the state of six relays associated with function selection
and isolation on the internal DMM. These relays are numbered K102
through K107.
• You can reset the cycle count on any of the channel relays, Analog Bus
relays, or bank relays (allowed only from remote) but the instrument
must be unsecured. See “To Unsecure the Instrument for
Calibration” on page 70 for more information.
Front Panel Operation: View > RELAY CYCLES
Turn the knob to read the count on the desired channel relay or
Analog Bus relay.
SYST:TIME 15,30,23.000
SYST:DATE 2004,11,24
Set time to 3:30:23.000 PM
Set date to November 21, 2004