Cleaning; Calibration Interval - Unitest CHB 4 Bedienungsanleitung

6.1 Cleaning

If the instrument is dirty after daily usage, it is advised to
clean it by using a damp cloth and a mild household deter-
gent.
Prior to cleaning, ensure that instrument is switched
off and disconnected from external voltage supply
and any other instruments connected (such as UUT,
control instruments, etc.).
Never use acid detergents or dissolvants for cleaning.

6.2 Calibration Interval

We suggest a calibration interval of one year. If the instru-
ment is used very often or if it is used under rough condi-
tions we recommend shorter intervals. If the instrument is
used few times only the calibration interval can be exten-
ded on to 3 years.
6.3 Battery Replacement
If the „BT" symbol appears in the display replace the batte-
ries. Proceed as follows:
Before battery replacement disconnect clamp-on-am-
meter from measuring circuit.
Switch off instrument
Open battery case by loosening the screw.
Open the battery case cover up to an angle of 45 ° (1)
and pull it then towards the right (2).
Cleaning /Battery Replacement
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