Checkline DFX-7 - Manual (Page 15)

DFX-7 Ultrasonic Flaw Detector
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be considered as similar to turning the volume up or down on a stereo receiver.
Refer to page 27 for further info.
DETECT MODE: The DFX-7 is equipped with optional detection modes; PEAK,
FLANK, or Z-CROSS (zero crossing). This options allows the user to decide where
the detection is acquired on the waveform echo. Refer to page 84 for further info.
3.6 GT1 – Menu
ALARM: Toggles the alarm function of gate 1; on, off, audible. The audible feature
sounds a beeper when the waveform breaks the threshold level, either above or
below, depending on the current DETECT setting. Refer to page 30 for further info.
DETECT: Enables the user to set the alarm detection to occur either above or below
the gates threshold level. Refer to page 30 for further info.
GATE1: Gates allow the user to view a specific inspection/measurement range, or
specific regions of the waveform, while ignoring others. In order to detect on a
waveform echo, and display the amplitude as a percentage of full screen height, the
echo must be inside the boundaries of the gate settings. The GATE1 feature adjusts
where the gate begins, according to the depth/thickness. Refer to page 30 for further
info.
GATE1 WIDTH: This feature allows the user to set the overall width of the gate, in
terms of distance, from the GATE1 setting. Refer to page 30 for further info.
THRESHOLD1: Enables the user to set the sensitivity level of Gate1 to a calibrated
screen height percentage. The threshold level will act as a starting point for the
alarm trigger, and is directly associated with the DETECT setting outlined above.
Refer to page 30 for further info.
POLARITY: The gates can be set to detect on either the positive or negative
polarity, or stroke, of the half or full wave cycle. It should be noted that if the VIEW is
set to positive, and the gate negative, the DFX-7 will not display an amplitude
percentage of full screen height. Refer to page 30 for further info.
3.7 GT2 – Menu