HP 34970A User Manual page 96

Data acquisition / switch unit
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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
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
ROUT:CHAN:ADV:SOUR EXT
TRIG:TIMER 5
TRIG:COUNT 2
INIT
To configure the instrument for 4-wire external scanning, send the
following command.
ROUTe:CHANnel:FWIRe {OFF|ON}[,(
(the SCAN annunciator will turn on).
Select the scan interval
Select the channel advance source
Set the scan interval to 5 seconds
Sweep the scan list 2 times
Initiate the scan
<
ch_list
>)]
@
4
97

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