Chapter 4 Features and Functions

Scanning With External Instruments

∙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).

4

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 {OFFON}[,(@<ch_list>)]

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