Checkline DFX-7 - Manual (Page 16)

Dakota Ultrasonics
12
ALARM: Toggles the alarm function of gate 2; 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.
GATE2: 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 GATE2 feature adjusts
where the gate begins, according to the depth/thickness. Refer to page 30 for further
info.
GATE2 WIDTH: This feature allows the user to set the overall width of the gate, in
terms of distance, from the GATE2 setting. Refer to page 30 for further info.
THRESHOLD2: Enables the user to set the sensitivity level of Gate2 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.
3.8 TRIG – Menu
TRIG: This feature toggles trigonometry feature on/off. This feature is used with
angle beam transducers for the inspection of welds, to calculate three
measurements: Beam path distance (
Ì), Surface distance (Æ), and Depth (È) from
the index point of the transducer. Refer to page 50 for further info.
THICKNESS: Used to set the thickness of the test material. The thickness will be
used to determine which skip/leg the DFX-7 is detecting on. Refer to page 50 for
further info.
ANGLE: Used to set the angle of the transducer, and used in the calculations above.
Refer to page 50 for further info.
X-OFFSET: This feature is used to calculate the surface distance in the trigonometry
function, as is a physical measurement from the index point of the probe to the front
of the wedge/can/shoe/case. Refer to page 50 for further info.
CSC OD: Curved surface correction to compensate for changing sound path
distance and angle. This feature is used in conjunction with ‘thickness’ in order to
calculate a correction factor. Refer to page 50 for further info.