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maximum echo. This helps to determine the position and amplitude of highest
echo in practical flaw detection and probe detection.
6.8.2 Operation Steps
Choose "AUTO SETUP” main menu, press corresponding key of Peak Holding
submenu to enable or disable Peak Holding function. When enable, a purple "×"
will be displayed on top of the maximum echo inside the gate, if this echo declines,
the "×" remains; if it rises or moves, the "×" will move to indicate the position of the
new highest point.
6.9 Auto Gain Adjustment
6.9.1 Summarize
Automatically adjust gain so that target echo height be the desired amplitude, this
is commonly used in forging test.
6.9.2 Operation Steps
(1) Move gate and capture under tested echo.
(2) Choose "AUTO SETUP" main menu, press Auto Gain submenu related key,
instrument makes gain control automatically to adjust the highest echo
amplitude within gate reaching 80% height of vertical coordinates (this height
can be set in parameters by operator, only need to adjust submenu "AGC" ).
6.10 Rectification
6.10.1 Summarize
This instrument sets four rectify methods: full-wave, positive rectify, negative
rectify, and RF. As to test task, mostly use is full-wave method. But in some
special application, choose unipolar rectify or RF will be more available because
of different purposes. Choose suitable rectify method for different applications to
improve resolution, increase the ratio of signal to noise and sensitivity.
