4 Features and Functions
126 Keysight 34970A/34972A User’s Guide
To control scanning with an external instrument, two control lines are provided.
When the 34970A/34972A and the external instrument are properly configured,
you can synchronize a scan sequence between the two.
In this configuration, you must set up a scan list to include all desired multiplexer
or digital channels. Channels which are not in the list are skipped during the scan.
The instrument automatically scans the list of channels in ascending order from
slot 100 through slot 300.
For an externally-controlled scan, you must either remove the internal DMM from
the 34970A/34972A or disable it (see “Internal DMM Disable” on page 175). Since
the internal DMM is not used, readings from multiplexer channels are not stored in
internal reading memory.
External connections are required to synchronize the scan sequence between the
34970A/34972A and the external instrument. The 34970A/34972A must notify the
external instrument when a relay is closed and settled (including channel delay).
The 34970A/34972A outputs a Channel Closed pulse from pin 5 on the rear-panel
connector (see previous page). In response, the external instrument must notify
the 34970A/34972A when it has finished its measurement and is ready to advance
to the next channel in the scan list. The 34970A/34972A accepts a Channel
Advance signal on the External Trigger input line (pin 6).
Channel Closed OUT
34970A/34972A
External DMM
Ext Trig INVM Complete OUT
Ext Trig IN
GND
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