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Useful Advice
Instrument sensitivity
Several variables including the test material itself, temperature, solar load and electrode type and size
will impact the Alarm Threshold setting required.
As noted in the Basic Physics section above, the detector will show a low-level current draw in micro-
amps (µA) as the electrode is passed over a coating. A threshold setting around 100µA above the
displayed current draw is often suitable; although attention should be given to verify the effectiveness
of the sensitivity setting; too low may cause false-alarms and too high could allow faults to go
undetected.
It may not always be possible to determine a suitable sensitivity setting. In such cases, increasing the
sensitivity until the detector switches to ‘Spark Only’ mode prevents the alarm from triggering unless a
direct connection to ground is made.
A higher test voltage may be required to compensate for current drawn as the electrode passes over
the coating. This method is less precise and will not detect weak or thin areas as readily. It is
recommended to consult with Buckleys in this situation as a multi-channel approach may provide an
optimum solution to the issues of excess quiescent current draw.
This generation of instrument is capable of detecting flaws much more rapidly than previous models.
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