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• You can use either the internal DMM or an external DMM to make
measurements of your configured channels. However, the instrument
allows only one scan list at a time; you cannot scan some channels
using the internal
DMM and others using an external DMM.
Readings are stored in 34970A memory only when the internal
DMM
is used.
• If the internal DMM is installed and enabled, the instrument will
automatically use it for scanning. For externally-controlled scans,
you must either remove the internal
DMM from the 34970A
or disable it (see “Internal DMM Disable” on page 145).
Scan Interval
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):
• You can set the instrument’s internal timer to automatically scan at a
specific interval. You can also program a time delay between
channels in the scan list.
• You can manually control a scan by repeatedly pressing from
the front panel.
• You can start a scan by sending a software command from the
remote interface (MEASure? or INITiate command).
• You can start a scan when an external TTL trigger pulse is received.
• You can start a scan when an alarm event is logged on the channel
being monitored.
5
Chapter 5 Remote Interface Reference
Scanning Overview
227