DFX-7
Ultrasonic Flaw Detector
11
GAIN:
The
DFX-7
has a 0-110dB gain range with 2dB resolution. This feature is
used to increase/decrease the strength or amplitude of the signal. This might easily
be considered as similar to turning the volume up or down on a stereo receiver.
Refer to page 28 for further info.
GAIN STEP:
Used to set the amount the GAIN is increased or decreased for each
key press. Step options of 0.2, 0.4, 1.0, 2.0, 4.0 and 6.0. Refer to page 101 for
further info.
DETECT:
The
DFX-7
is equipped with optional detection modes; PEAK, FLANK, or
Z-CROSS (zero crossing). This option allows the user to decide where the detection
is acquired on the waveform. Refer to page 103 for further info.
3.6 GT1 – Menu
ALARM 1:
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 31 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 31 for further info.
GATE 1:
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 31 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 31 for further info.
THRESHOLD 1:
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 31 for further info.
POLARITY 1:
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 31 for further info.
