E-10
ElektroPhysik
7. General remarks on Operation
and Application
-
The relationship between high voltage adjustment
and coating thickness as defined in the setting
menue conforms to the DIN 55670 regulations.
As test conditions may vary according to
configuration, this relationship should only be
considered as a rough setting. We recommend
to select sensitivity as follows:
1. For each test object, the minimum test voltage
should be determined at which pores can be
detected reliably.
2. After the minium test voltage has been
determined, the maximum test voltage at which
spark discharge starts to damage the test object
should be determined
A suitable test voltage results from the mean value
evaluated from these two values (minium and
maximum voltage).
-
For highly conducting surfaces or surfaces subject
to capacitance loading, it is recommended to
select a sensitivity value low enough to prevent
damage but high enough to ensure a reliable pore
detection.
-
If the high voltage probe is slowly approaching
ground - i.e. without any test sample being in
between - a reliable pore detection will only take
place if the distance between probe and ground
equals to the ajusted „layer thickness“. Hower, low
energy spark discharges may take place even
before the adjusted layer thickness has been
reached.
Please note: This is NOT a malfunction of the
instrument!
7. 1 Testing procedure
After you have carried out earthing according to chapter
3, after setting the instrument into operation and after
setting the instrument according to your requirements
press ESC to quit the main menu. Then choose „Current
readings“
Current values
No. of pores (default setting: 0)
