Features and Functions 4
Keysight 34970A/34972A User’s Guide 127
– You can configure the event or action that controls the onset of each sweep
through the scan list (a sweep is one pass through the scan list). When the
internal DMM is removed (or disabled), the default scan interval source is
“timer.” For more information, refer to “Scan Interval” on page 94.
– You can configure the event or action that notifies the 34970A/34972A to
advance to the next channel in the scan list. Note that the Channel Advance
source shares the same sources as the scan interval. However, an error is
generated if you attempt to set the channel advance source to the same
source used for the scan interval.
– You can specify the number of times the instrument will sweep through the
scan list. When the specified number of sweeps have occurred, the scan stops.
For more information, refer to “Scan Count” on page 117.
– 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
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