DeFelsko PosiTest HHD Serie Notice D'instruction page 8

Sensitivity Adjustment By default, the Sensitivity of the
μA
detector is factory-set to ensure that the instrument alarms when
holidays are detected, while ignoring 'false positives' due to surface
moisture, electrode movement, etc. For most applications, the
default sensitivity setting is ideal.
To verify that the Sensitivity is set correctly, attach the electrode to be
used for the desired application, and find a known holiday in the
coating or place a shim with the same thickness as the coating over
the bare substrate with a 1mm diameter hole drilled in the center.
Ensure that the PosiTest HHD C detects the holiday or hole in the
shim, and that it does not alarm over areas without defects or
holidays.
If a sensitivity adjustment is required press the
adjust the sensitivity. Press
NOTE:
IMPORTANT:
on the object under test, the following steps should always be
followed when using the PosiTest HHD C:
1. Perform all steps listed in the "Quick Start" (pg. 4).
2. Enable Detection Mode by holding the trigger of the
instrument. The PosiTest HHD C will output high voltage at
the selected test voltage. The lightning bolt icon
at the bottom of the display, and the instrument will emit a tick
sound while Detection Mode is enabled.
The voltage output of the PosiTest HHD C is regulated and
maintains the test voltage under normal electrode loading.
When in Detection Mode, the voltage at the electrode is
displayed on the PosiTest HHD C. Minor fluctuations on the
display are normal during inspection as the PosiTest HHD C is
regulating the test voltage. When the electrode is connected to
ground, the display will show "---" indicating that the electrode
voltage is less than the minimum of 500V.
Instrument Operation
To reduce the possibility of building static charge
to accept and exit.
7
or buttons to
-
+
will appear