Setting The Device For Testing - NOVOTEST UD3701 Operation Manual

screen (Figure 2.26). Received signal is a bidirectional radio-frequency signal, that can be
displayed on the screen in different modes:
5.1 «RADIO» – signal is represented in radio-frequency mode;
5.2 «HW 1»; «HW 2» – signal is represented with rectification.
а) RADIO
Also, in «Tract» parameters group user can turn on and set in digital band filter, that allows to
improve ratio signal/noise. Better effect from the filter user can get when high gain is set and when
testing materials are of high damping.
Note – For most standard device application user does not need to turn on the filter.
So, to set in the filter user has in parameter «F.FILTER» input central operating frequency. Filter
band is constant ~ 1 MHz. To turn on the filter: in parameter «FILTER» select «ON» (Figure 2.27).
а) filter is turn off
Figure 2.27 – Usage of the digital band filter - parameter «FILTER»
In case of testing very thin objects, it is possible to reduce the "dead" zone of the probe by
reducing the generator level «Energy» (100V, 150V, 200V).

2.4.6 Setting the device for testing

For correct measurement of defect coordinates and thickness of tested object it is necessary to set
the correct velocity for UT waves propagation into the tested material (velocity measurement find in
p.2.5.5). Velocity of UT waves propagation is set in parameters group «Basic», parameter «VEL»
(from 1000 to 9999 m/s), Figure 2.28.
Caution!
Figure 2.26 – A-scan modes - «DET» parameter
Ultrasonic Flaw Detector NOVOTEST UD3701
b) HW 1
b) filter is turn on
Operation manual
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