Agilent Technologies J3972A User's Guide Page 437

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Alarms and Traps
Setting Alarms
436 5967–9446
Thresholds
The threshold determines when an alarm triggers and when it rearms,
allowing it to trigger again.
The above or below indicator signifies whether to configure a rising or
falling alarm, respectively. An alarm is triggered only when the value for
the monitored object crosses the threshold in the appropriate direction.
Consequently, once an alarm triggers, the alarm doesn’t rearm until the
value for the monitored object crosses back over the threshold in the
opposite direction.
You can configure an alarm with different rising and falling thresholds,
as discussed on page 439.
Figure 89 shows a rising alarm configured with the same rising and
falling thresholds. Compare this figure with figure 90 on page 439 which
shows an alarm with different rising and falling thresholds.
If the alarm in figure 89 were configured as a falling alarm (rather than
a rising alarm), it would trigger three times, at the points marked with
, and it would rearm three times, at points , , and .
Figure 89 Rising Alarm with the Same Rising and Falling Thresholds
Normal range for
monitored object
Rising alarm triggers
four times, at the
numbered locations
Alarm rearms at
points marked with
➀➁
Threshold
➚➚
Graph represents
value of monitored
object over time
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