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Features and Functions 2
34980A User’s Guide 13
• To view the readings in memory, use the View key (the readings are
not erased when you read them). Each time you initiate a new
DMM-only scan, the instrument will clear the previous set of readings
from memory.
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 42.)
• 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.