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• An externally-controlled scan can also include a read of a digital port
or a read of the totalizer count on the multifunction module. When
the channel advance reaches the first digital channel, the instrument
scans through all of the digital channels in that slot and stores the
readings in reading memory (only one channel advance signal is
required).
• You can configure the list of channels for 4-wire external scanning
without the internal
DMM. When enabled, the instrument
automatically pairs channel n with channel n+10 (34901A) or n+8
(34902A) to provide the source and sense connections.
• Front-Panel Operation: To select the channel advance source, choose
from the following items.
AUTO ADVANCE , EXT ADVANCE
To initiate the scan, press (the
SCAN annunciator will turn on).
To configure the instrument for 4-wire external scanning, choose the
following item.
4W SCAN
• Remote Interface Operation: The following program segment
configures the instrument for an externally-controlled scan.
TRIG:SOUR TIMER Select the scan interval
ROUT:CHAN:ADV:SOUR EXT Select the channel advance source
TRIG:TIMER 5 Set the scan interval to 5 seconds
TRIG:COUNT 2 Sweep the scan list 2 times
INIT Initiate the scan
To configure the instrument for 4-wire external scanning, send the
following command.
ROUTe:CHANnel:FWIRe {OFF|ON}[,(
@<ch_list>)]
4
Chapter 4 Features and Functions
Scanning With External Instruments
97