Berner 185139 Bedienungsanleitung Seite 34

In order to avoid an electrical shock hazard you must observe
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the specified precautionary measures when working with
voltages greater than 120 V (60 V) DC or 50 V (25 V) eff AC.
These values represent the specified limits of safe-to-touch
voltages in accordance with DIN VDE (values given in brackets
apply to medical or agricultural applications).
Before taking each measurement, ensure that the test leads and
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the measuring instrument are in a flawless condition.
The test leads and test probes must only be handled using the
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isolated grips. Avoid touching the tips of the test probes under
all circumstances.
The test instrument must only be used for the specified
measurement range.
According to the standard EN 61010-1 the following measurement
categories are defined:
Measurement Category CAT II
Measurements on circuits that are electrically connected directly to
the network, via plugs in the home, office and laboratory.
Measurement Category CAT III
Measurements on the building installations: Fixed consumer units,
distributor connection, equipment fitted permanently to the
distributor.
Measurement Category CAT IV
Measurements at the source of the low voltage installation: Meter,
primary surge protection, main connection.
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