Checkline DFX-7 - Manual (Page 33)

DFX-7
Ultrasonic Flaw Detector
29
GAIN: The DFX-7 has 100dB gain range from (-30 to 70 dB), used in conjunction
with the attenuator feature above. This feature is used to increase/decrease the
power 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 74 for further info.
AGC: This an automatic gain control used in E-E (echo-echo), and E-EV (echo-echo
verify). The DFX-7 is equipped with an automatic gain control when operating in -E
(echo-echo), and E-EV (echo-echo verify) modes only. This feature automatically
increases/decreases the power or amplitude of the signal, to an optimal input to
output signal ratio. This might easily be considered as similar to turning the volume
up or down on a stereo receiver. Alternatively, the AGC can be manually controlled.
The DFX-7 is equipped with manual override, using an arbitrary range of 1-20 clicks.
The higher the number the better the dynamic gain range, and visa versa. Refer to
page 74 for further info.
3.6 GT1 – Menu
GATE1: Gates allow the user to view a specific measurement range, or sections of
the waveform, and ignore others. The Gate1 feature adjusts the start of the gate,
according to time/distance. Gate 1 can be used in all pulse-echo and echo-echo
measurement modes. Refer to page 83 for further info.
GATE1 WIDTH: This feature allows the user to set the overall width of the gate, in
terms of distance, from the starting value of Gate1. Refer to page 83 for further info.
THRESHOLD1: Enables the user to set the sensitivity level of Gate1. The amplitude
of the signal must reach or exceed the threshold level before a measurement is
detected. Refer to page 83 for further info.
3.7 GT2 – Menu
GATE2 WIDTH: This feature allows the user to set the overall width of the gate, in
terms of distance, from the starting value of HoldOff2. Refer to page 83 for further
info.
HOLDOFF 2: Provides the user with the ability to delay the starting point of Gate2, a
specific distance from the first detection point found inside of the boundaries of the
Gate 1 settings. If no detection is found, the Gate1 width value is used as a starting
value for Gate2. Refer to page 83 for further info.