4 Features and Functions
114 Keysight 34970A/34972A User’s Guide
– Front-Panel Operation:
EXTERNAL SCAN
To initiate the scan, press . The EXT annunciator turns on as a reminder
that an External Scan is in progress. When a TTL pulse is received, the scan
starts and readings are stored in memory. To stop scan, press and hold
.
– Remote Interface Operation: The following program segment configures the
instrument for an External Scan.
Scanning on alarm
In this configuration, the instrument sweeps the scan list once each time a
reading crossing an alarm limit on a channel. You can also assign alarms to
channels on the multifunction module. For example, you can generate an alarm
when a specific bit pattern is detected or when a specific count is reached.
– In this scan configuration, you may use the Monitor function to continuously
take readings on a selected channel and wait for an alarm on that channel. The
monitored channel can be part of the scan list but you can also use a channel
on the multifunction module (which does not have to be part of the scan list
and you do not have to use the Monitor function). For example, you can
generate an alarm on a totalizer channel which will initiate a scan when a
specific count is reached.
TRIG:SOURCE EXT Select the external trigger configuration
TRIG:COUNT 2 Sweep the scan list 2 times
INIT Initiate the scan
To stop a scan, send the ABORt command.
For complete details on configuring and using alarms, refer to “Alarm Limits”
starting on page 151.
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