Operation
20 Testboy
®
TB 313
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, equip-
ment 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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