3 Features and Functions
120 Keysight 34980A Mainframe User’s Guide
Remote Interface Operation:
– You can use the MEASure? command without specifying a <ch_list> to quickly
take a stand-alone DMM reading. Note, however, that with the MEASure?
command, most measurement parameters are set to their default values.
– To close the desired channel relays and Analog Bus relays, use the
ROUTe:CLOSe command. The Analog Bus relays on the multiplexer and matrix
modules are numbered s911, s912, s913, etc.
– To directly control all measurement parameters or triggering, use the
CONFigure, SENSe, and TRIGger commands without specifying a <ch_list>
parameter. To initiate the measurement, use the INITiate or READ?
command without specifying a <ch_list>. Each time you initiate a new
measurement, the instrument will clear the previous set of readings from
memory.
– To stop a measurement in progress, use the ABORt command.
– To view the readings in memory, use the FETCh? command (the readings are
not erased when you read them).
Scanning Mode
In the Scanning Mode, the 34980A automatically controls a sequence
of measurements using the internal DMM, possibly across multiple channels, and
stores the results in memory. The 34980A closes and opens the appropriate
channel relays and Analog Bus relays required for the sequence. The following
general rules apply to the Scanning Mode (for more information on using the
Scanning Mode, see “Scanning” on page 148.)
– Any channel that can be “read” by the instrument can also be included in a
scan. A scan can also include a read of a digital channel or a read of the
totalizer count on the digital modules.
– Before you can initiate a scan, you must set up a scan list to include all desired
multiplexer or digital channels. Channels which are not in the scan list are
skipped during the scan.
– The Analog Bus relays are automatically opened and closed as required during
the scan to connect to the internal DMM for the measurement. For example, all
2-wire measurements use the ABus1 (MEAS) relays for 4-wire measurements,
the ABus2 (SENS) relays are used in addition to the ABus1 relays.
– Each time you initiate a new scan, the instrument will clear the previous set of
readings from memory.
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