Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
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3 Features and Functions<br />
Remote Interface Operation:<br />
You can use the MEASure? command without specifying a to<br />
quickly take a stand- alone DMM reading. Note, however, that with the<br />
MEASure? command, most measurement parameters are set to their<br />
default values.<br />
To close the desired channel relays and Analog Bus relays, use the<br />
ROUTe:CLOSe command. The Analog Bus relays on the multiplexer and<br />
matrix modules are numbered s911, s912, s913, etc.<br />
To directly control all measurement parameters or triggering, use the<br />
CONFigure, SENSe, and TRIGger commands without specifying a<br />
parameter. To initiate the measurement, use the INITiate or<br />
READ? command without specifying a . Each time you initiate a<br />
new measurement, the instrument will clear the previous set of<br />
readings from memory.<br />
To stop a measurement in progress, use the ABORt command.<br />
To view the readings in memory, use the FETCh? command<br />
(the readings are not erased when you read them).<br />
Scanning Mode<br />
In the Scanning Mode, the <strong>34980A</strong> automatically controls a sequence<br />
of measurements using the internal DMM, possibly across multiple<br />
channels, and stores the results in memory. The <strong>34980A</strong> closes and <br />
opens the appropriate channel relays and Analog Bus relays required <br />
for the sequence. The following general rules apply to the Scanning Mode<br />
(for more information on using the Scanning Mode, see “Scanning” on<br />
page 108.)<br />
Any channel that can be “read” by the instrument can also be included<br />
in a scan. A scan can also include a read of a digital channel or a read<br />
of the totalizer count on the digital modules.<br />
Before you can initiate a scan, you must set up a scan list to include all<br />
desired multiplexer or digital channels. Channels which are not in the<br />
scan list are skipped during the scan.<br />
The Analog Bus relays are automatically opened and closed as required<br />
during the scan to connect to the internal DMM for the measurement.<br />
For example, all 2- wire measurements use the ABus1 (MEAS) relays<br />
for 4- wire measurements, the ABus2 (SENS) relays are used in addition<br />
to the ABus1 relays.<br />
Each time you initiate a new scan, the instrument will clear the<br />
previous set of readings from memory.<br />
82 <strong>Agilent</strong> <strong>34980A</strong> Mainframe User’s Guide