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EPOCH 4PLUS
detailed view of an indication and to make better judgements regarding flaw location and
depth.
Zoom is useful when inspecting particularly large or thick components when detail is lost
due to using long screen ranges. Use the Zoom function to look at small sections of the test
piece without disturbing the instrument’s original calibration.
6.9 Activating Gate Alarms
The EPOCH 4PLUS features a variety of alarm configurations that can be used in either
the Single or Dual Gate modes. An alarm on Gate 2 can only be set if Gate 2 is turned on
by pressing [GATE 2] and then pressing [F4] for ON.
6.9.1 Threshold Alarms
Threshold alarms can be set on Gate 1 and/or Gate 2.
To set a threshold alarm on Gate 1, follow these steps:
1. Press [GATE 1] and use the start, width, and level parameters to position the gate over
the desired area.
2. Press [2nd F], [GATE 1] (ALARM 1). The alarms are displayed in the function
boxes at the bottom of the screen.
3. Press [F1] for positive logic or [F2] for negative logic. A negative logic alarm
indicates a signal is absent from the gate. A positive logic alarm indicates a signal is
present within the gate. Either Gate 1 or Gate 2 can be set positive or negative.
Once a threshold alarm is activated, markers at the starting and ending points of the
gate will point upwards or downwards to indicate which type of alarm has been set.
Figure 16 Negative Logic Alarm
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