16
The most suitable option is one in which the two parameters do not
exceed, or exceed but not significantly the 50 %. Operation in mode, in
which one of the parameters exceeded the threshold of 90 % is
unacceptable and requires the adjustment of flaw detector parameters.
Lightning of a left overload indicator
(pos. 10, Figure 8)
-
indicates that
unacceptably large amplitude signal came to the input of the receiving circuit.
The flaw detector electronic unit displays the signal in complex plane that
allows to foil defects by waveform analysis (Figure 9):
Figure 9 –
Display of signal in the complex plane (XY)
Figure 10 –
Mix of two frequencies (MIX)
The flaw detector has the mechanism of automatic flaw alarm (ALARM).
It is provided for the creation of up to 4 "frames" (threshold levels) of alarm
for each frequency and mix (examples of threshold levels see Figures 14, 15,
16, 17). These frames together with the signal form an event (for example, the
threshold level exceeding by the signal). An operator is able to adjust the
reaction to an event. Reaction to an event can be the following:
−
LEDs illuminating on the instrument panel;
−
or LEDs illuminating and sound alarm.