Checkline DFX-7 - Manual (Page 13)

DFX-7 Ultrasonic Flaw Detector
9
3.2 Probe – Menu
TYPE: Enables the user to select the type of transducer being used, either Single or
Dual.
PULSE: The DFX-7 has an adjustable pulse width for both high penetration and
resolution applications. The pulse width refers to the duration of time the pulser is
on. The options are Spike, Thin, and Wide. Refer to page 86 for a further
explanation.
MAX PRF: This feature controls the pulse repetition frequency of the DFX-7. The
maximum frequency is 333 Hz. However, the DFX-7 will automatically adjust the
PRF according to what the current delay and range settings have been adjusted to.
Larger the range, the slower the repetition frequency will automatically be set for.
DAMPING: The ability to control the amplifiers output impedance to match the
impedance of the transducer, and optimize overall transducer performance.
Adjustable at: 50, 100, 300, 600, 1500 ohms. Refer to page 90 for further info.
PULSER VOLT: Adjustable pulser voltage: 100, 150, and 200 volt. Refer to page
87 for a further explanation.
3.3 CAL – Menu
MAT: Select the material velocity from a chart of basic material types when a known
sample thickness, or material velocity cannot be obtained.
MATL 1PT: Performs a single point calibration. Used in conjunction with the MATL
2PT option for the calibration process. Refer to page 35 for further info.
MATL 2PT: Performs a two-point calibration. This option allows the user to
automatically calculate the velocity by entering a second known sample thickness.
Refer to page 35 for further info.
VELOCITY: Function to calibrate the DFX-7 by setting the velocity to a known
material velocity. Refer to page 71 for further info.
ZERO PROBE: Used to zero the transducer and calibrate the screen. The DFX-7 is
zeroed in much the same way that a mechanical micrometer is zeroed. If the DFX-7
is not zeroed correctly, all of the measurements made using the DFX-7 may be in
error by some fixed value. Refer to the section on page 35, for further info.