Static Electricity - Elcometer 266 Manual Del Usuario

10 SETTING THE SENSITIVITY (continued)
2 If the sensitivity is set to
'AUTO µA', press 'µA'. The
last used set current value will
be displayed.
3 Using the
set current to the required
value; each press changes the
display by 1 µA.
Press and hold either key to

advance rapidly.
4 Press OK when finished.
The new set current will be displayed on
the reading screen (a). If the sensitivity
lock is active, see Section 5.6 'Voltage and
Sensitivity Locks' on page en-11, a key icon
indicates that the sensitivity is locked (b).

11 STATIC ELECTRICITY

As the probe is moved over the surface of a coating, a static charge
builds up which can:
Cause objects in contact with the surface to become charged with

the same polarity.
Induce an opposite charge on nearby objects electrically

insulated from the surface.
Charged surfaces (or adjacent objects) can be discharged by turning
off the high voltage and brushing the surface with the probe.
Induced static on the operator is minimised by means of a dissipative
contact point on the high voltage probe handle (the rubber handgrip).
Simply holding the handle ensures that the operator is always at the
same potential as the earth signal return cable, and therefore the test
substrate.
It is recommended that the substrate of the item being tested is
bonded to an earth potential, thus preventing any overall build-up of
charge, which can otherwise remain on an isolated test piece for
several minutes after testing has been completed.
en-21
R
 
keys, adjust the
R
a
www.elcometer.com
a
b