© PCE Instruments
18
Eng
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6 - Parameters of the measured signal (A
– amplitude in “Volts”, P – phase
in “degrees”, D – equivalent depth of flaw in “mm” or conductivity in
“MSm/m”), T - current value of a receive circuit parameters (“…/” – load of
the input circuit before
the balancing; “…/” non-balance of the input circuit;
“…” – the current value of the input circuit expressed in % from the maximum
possible), F- sampling frequency
7 - Frequency number
8 - Battery life indicator
9 - Temporary memory indicator of the flaw detector
10 - Digital overload indicators for receiving circuit
11 - digital trigger indicators of ALARM levels for the first, second and mix of
frequencies respectively (from left to right)
Fig. 8
– The Flaw Detector Interface
Note
– Parameter "T: …/…/... %" shows:
1) The value of a signal amplitude at the input of the receiving circuit
expressed in % from the maximum possible,
2) Input circuit is not balanced, after performing the balancing in %;
3) Current value of the load of the input circuit expressed in % from the
maximum possible.
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.
Lighting of a left overload indicator
(pos. 10, Fig. 8)
– indicates that
unacceptably large amplitude signal came to the input of the receiving
circuit.
The flaw detector electronic unit displays the signal in the complex plane that
allows to foil defects by waveform analysis (Fig. 9):
