Features and Functions 4
Keysight 34970A/34972A User’s Guide 153
– Alarms are logged in the alarm queue only when a reading crosses a limit, not
while it remains outside the limit and not when it returns to within limits.
– Four TTL alarm outputs are available on the rear-panel Alarms connector. You
can use these hardware outputs to trigger external alarm lights, sirens, or send
a TTL pulse to your control system. You can also initiate a scan sweep (no
external wiring required) when an alarm event is logged on a channel. For
complete details, refer to “Using the Alarm Output Lines” on page 157.
– The following table shows the different combinations of front-panel
annunciators that may appear while using alarms.
– In addition to being stored in reading memory, alarms are also recorded in
their own SCPI status system. You can configure the instrument to use the
status system to generate a Service Request (SRQ) when alarms are
generated. See the Keysight 34970A/34972A Programmer’s Reference Help
for more information.
An alarm is enabled on the displayed channel.
The indicated HI or LO limit is being configured on the indicated alarm (shown while in the
Alarm menu).
An alarm has occurred on one or more channels. The behavior of the alarm output lines
tracks the alarm annunciators on the front panel.
The alarm output lines have been cleared but alarms remain in the queue.
Alarm Event No Alarm
Upper Limit
Lower Limit
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