TESTBOY TB 312 Bedienungsanleitung Seite 36

Operation
| In order to avoid risk of electric shock, you must observe the specified
precautions when working with voltages greater than 70 V (35 V) DC or
33 V (16 V) eff AC. These values represent the limits of safe-to-touch
voltages in accordance with DIN VDE. (Values given in brackets apply to
medical or agricultural areas, for example)
| Before taking each measurement, ensure that the test lead and the test
instrument are in perfect working order
| The test leads and test probes must only be handled using the grips pro-
vided. Avoid touching the test probes under any circumstances.
The test instrument must only be used for the measuring ranges
specified.
According to the standard EN 61010-1, the following measurement categories are de-
fined:
Measurement category CAT II
Measurements on circuits that are directly electrically connected to the network, via
plugs in the home, office and laboratory.
Measurement category CAT III
Measurements on 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: meters, primary surge pro-
tection, mains connection.
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Testboy TB 312