3
Features and Functions
198
Keysight 34980A Mainframe User’s Guide
Internal DMM Disable
You can scan through the configured channels using either the internal DMM (an
optional accessory with the 34980A) or an external instrument. For
externally-controlled scans, you must either disable the internal DMM or remove
it from the instrument.
– For information on controlling a scan with an external instrument, refer to
“Scanning With External Instruments”
– With the internal DMM disabled, any command received that is directed to the
DMM or requires its use (e.g., configuring a multiplexer channel for a DMM
measurement), will generate an error.
– When you change the state of the internal DMM, the instrument issues a
Factory Reset (
*RST
command).
– If you ordered the internal DMM, it is enabled when shipped from the factory.
– The internal DMM setting is stored in
volatile
memory and will be enabled (ON)
when power is turned off or after a Factory Reset (
*RST
command).
Front Panel Operation:
Utility > DMM
Remote Interface Operation:
INSTrument:DMM[:STATe] {OFF|ON}
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 200 for
more information.
