3 Features and Functions
176 Keysight 34980A Mainframe User’s Guide
– 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 179.
– 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. Refer to the Keysight
34980A Programmer’s Reference Help file for more information on the Status
System.
Upper Limit
Lower Limit
Alarm Event No Alarm
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.
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