Elcometer 266 Manual Del Usuario página 21

10 SETTING THE SENSITIVITY (continued)
If 'AUTO' is not displayed:
1 Press the SENS key. The
'SET SENSITIVITY' screen will
be displayed.
2 Press AUTO (a) to switch to
automatic sensitivity mode.
3 Press OK to return to the
reading screen.
4 Check that 'AUTO' is now
displayed as the set value of
the current.
10.2 MANUALLY SETTING THE SENSITIVITY
Manual setting of sensitivity may be required in certain instances and
to comply with some test standards. To set the sensitivity of the
instrument manually, the set current value must be adjusted.
The set current value is adjustable between 5 µA and 99 µA in 1 µA
increments.
As the value is increased towards its maximum (99 µA), the

instrument becomes LESS sensitive.
As the value is decreased towards its minimum (5 µA), the

instrument becomes MORE sensitive.
Typically, manual adjustment may be required when testing partially
conductive coatings at high voltages.
The probe is placed onto a section of coating known not to contain any
flaws. The measured 'background' current flow is noted and the set
current value then adjusted to a value a few µA above this figure.
Erroneous alarms due to the background current flow are therefore
avoided in this instance.
1 With the reading screen displayed, press
the SENS key. The 'SET SENSITIVITY'
screen will be displayed.
If the sensitivity has been locked, see Section

5.6 'Voltage and Sensitivity Locks' on page
en-11, a warning screen will be displayed;
press UNLOCK to allow the current to be
adjusted - the lock will re-engage automatically
after the current has been set.
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