© PCE Instruments
25
Eng
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2.
“
PRE AMP” - preamplifier for amplifying the probe voltage;
varied in the range from -6 to 40 dB with a step of 0,1, 1, 10 dB.
To adapt the eddy current probe that is to be used, you can adjust
the preamplification in 0.1; 1; 6; 10 dB steps between 0dB and 40dB.
Please avoid a preamplification overload because it may tamper with the
results of the measurement. The overload is indicated by the amber light
of the ALARM-LED.
3. "
GAIN" - gain for amplifying the probe voltage; varied in the
range from 0 to 30 dB with a step of 0,1; 1; 10 dB.
Here you adjust the signal amplitude for the best possible display of the
eddy current signal by moving the probe across a reference defect while
slowly increasing the gain. You can adjust the gain between 0 dB and 30
dB. The display shows the overall gain simultaneously for X and Y-
coordinates.
4. "
H GAIN"
– horizontal gain for amplifying the probe voltage;
varied in the range from 0 to 30 dB with a step of 0,1; 1; 10 dB.
5. "
V GAIN dB"
– vertical gain for amplifying the probe voltage;
varied in the range from 0 to 30 dB with a step of 0,1; 1; 10 dB. This
item is often used to set up single coil probe for visual increase of
angle between lift-off signal and signal from defect.
6. "
DRIVE" - ECP excitation voltage
3
; it is possible to set specified
values of 0.5; 1; 2; 4; 6 V (double amplitude value). The maximum
voltage for single coil probe is 2V. The maximum voltage for other
types of probes is limited by 6V. High voltage is used for subsurface
defects detection.
7. "
PHASE" - signal phase change (signal turn)
– from 0 to 360˚
with a step of 0.1˚, 1˚, 10˚.
3
ECP exciting voltage is selected from the range indicated in the
registration certificate for the given ECP.
