DMTA-10055-01EN, Rev. A, February 2015
Chapter 7
134
Figure 7-8 Gate tick marks indicating alarm threshold type
To set a threshold alarm
1. Activate the gate by selecting Gate<n> > Status = On.
2. Position the gate to cover the desired area.
3. Choose Gate<n> > Alarm, and then select either the Positive or Negative
threshold alarm condition.
7.8.2 Minimum Depth Alarm
The EPOCH 650 ultrasonic flaw detector is equipped with a minimum depth alarm
that is triggered whenever the current thickness measurement reading falls below an
operator-defined level. The minimum depth alarm can be used either with a single
gate or in echo-to-echo measurement mode.
7.8.3 Minimum Depth Alarm with a Single Gate
When the minimum depth alarm is activated, a marker appears on the gate to visually
indicate the current setting (see Figure 7-9 on page 135). Any indication that exceeds
the gate threshold to the left of the marker triggers the alarm.
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