Dakota Ultrasonics DFX-8 plus MANUAL1 - Manual (Page 19)

DFX-8 Series Ultrasonic Flaw Detectors
15
MEAS: Toggles the units displayed as a relationship of either the signal amplitude
and DAC curve, or just the signal according to screen height. The units are as:
%FSH, %DAC, and dB. Refer to page 66 for further info.
CURVE: Selectable signal or multi DAC curve options. The displayed curve options
are: DAC, -2dB, -6dB, -10dB, (-6dB/-12dB), (-6dB/-14dB). Once the DAC curve has
been generated, these options can be toggled at any time. Refer to page 66 for
further info.
TRIGGER CURVE: Used to set the alarm threshold for the DAC curve. The options
are; at DAC, -2dB, -6dB, -10dB, -12dB, -14dB, or using an independent gate. The list
of trigger options will change according to which CURVE option has been selected.
Refer to page 66 for further info.
DPOLARITY: Used to select the polarity of the DAC curves generated, either
positive or negative. Refer to page 66 for further info.
FIT: Creates either a linear (straight line) or spline (nice curve) fit between calibrated
reference points. Refer to page 66 for further info.
3.12 DGS – Menu
DGS: Toggles the DGS feature on/off. Distance Gain Size (DGS) curve is used to
configure a variable threshold for the gate using a single reflector using an empirically
derived set of curves. Refer to page 77 for further info.
REFERENCE GAIN: Toggles the DRAW mode on/off, and used to set the reference
gain from a given reference standard. Refer to page 80 for further info.
TRIGGER CURVE: Used to set the alarm to detect on either the DGS curve, or
independent GATE. Refer to page 80 for further info.
EFF PROBE DIAMETER: Used to set the effective probe diameter of either a round
or square/rectangular crystal element, and used as a variable to calculate the near
field length. Refer to page 78 for further info.
PROBE FREQUENCY: Used to set the center frequency of the probe/transducer.
The frequency will either be scribed on the probe itself, and additionally listed on the
transducer certificate. Refer to page 80 for further info.
CURVE SIZE (ERS): Used to select the Effective Reflector Size that will be used
from the DGS/AVG chart. Refer to page 80 for further info.
ATTENUATION: Toggles the ATTENUATION on/off. The parameters in the sub
menu are used to compensate for additional factors that affect the propagation of
sound energy, based on the material, surface condition, and differences between the
reference standards versus test material. Refer to page 81 for further info.