72 34980A User’s Guide
2 Features and Functions
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 digital modules, etc.).
• You can store at least 500,000 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 reading memory are always from the
most recent scan.
• Up to 20 alarms can be logged in the alarm queue. If more than 20
alarm events are generated, they will be lost (only the first 20 alarms
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: View > ALARMS
From the front panel, you can view the first 20 alarms in the queue.
After turning the knob to the desired channel, press the left or right
arrow keys to view the alarm reading. Notice that the annunciators
indicate which alarm is being viewed.
Note: The alarm queue is cleared when you read the alarms.
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