HP 34970A manual Alarm queue is cleared when you read the alarms 126

Chapter 4 Features and Functions

Alarm Limits

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If an alarm occurs on a channel as it is being scanned, then that channel’s

alarm status is stored in tw”z x	as the readings are taken.
As alarm events are generated, they are also logged in an ttxx			,
which is separate from reading memory. This is the		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 ” 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 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) w clear the alarm queue.

∙Sctxt”: 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

NThe alarm queue is cleared when you read the alarms.

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