Features and Functions 4
Keysight 34970A/34972A User’s Guide 155
Viewing stored alarm data
If an alarm occurs on a channel as it is being scanned, then that channel’s alarm
status is stored in reading memory as the readings are taken. As alarm events are
generated, they are also logged in an alarm queue, which is separate from reading
memory. This is the only place where non-scanned alarms get logged (alarms
during a monitor, alarms generated by the multifunction module, etc.).
– You can store up to 50,000 readings in memory during a scan. You can read
the contents of reading memory at any time, even during a scan. Reading
memory is not cleared when you read it.
– Each time you start a new scan, the instrument clears all readings (including
alarm data) stored in reading memory from the previous scan. Therefore, the
contents of memory are always from the most recent scan.
– Up to 20 alarms can be logged in the alarm queue. If more than 20 alarms are
generated, they will be lost (only the first 20 are saved).
– The alarm queue is cleared by the *CLS (clear status) command, when power
is cycled, and by reading all of the entries. A Factory Reset (*RST command) or
Instrument Preset (SYSTem:PRESet command) does not clear the alarm
queue.
– Front-Panel Operation: From the front panel, you can view the first 20 alarms
in the queue. After turning the knob to the desired channel, press and
to view either the alarm reading or the time that the alarm occurred. Notice
that the annunciators indicate which alarm is being viewed.
ALARMS
– Remote Interface Operation: The following command reads data from the
alarm queue (one alarm event is read and cleared each time this command is
executed).
SYSTEM:ALARM?
The alarm queue is cleared when you read the alarms.
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