Connecting The Measuring Cables; Measuring Categories - Westfalia 99 31 54 Bedienungsanleitung

Connecting the Measuring Cables

The measuring cables provided are capable of taking measure-
ments up to a maximum of 600 V.
The measurement of high voltages should always be performed
with great care and only when a person trained in first aid is
present.
Important! The maximum allowable input voltage of this unit is
600 V (CAT II) and must not be exceeded.

Measuring Categories

 (formerly CAT I). This measuring category is intended for
taking measurements on circuitry not directly connected to the
power mains.
 The measuring category CAT II is intended for taking
measurements on low-voltage circuitry. Examples for this are
household appliances, mobile electric devices or similar
equipment and as well as power sockets with a distance of
more than 10 m to CAT III sources and power sockets with a
distance of more than 20 m to CAT IV sources.
 The measuring category CAT III is intended for taking
measurements on house installations. Examples for this are
measurements on switches, power sockets, distribution boxes,
three-phase buses, circuit breakers, wiring, terminal strips and
connection boxes on fixed house installation, but also for
measurements on industrial devices and equipment such as
permanently installed motors.
 The measuring category CAT IV is intended for taking
measurements on sources of low-voltage installation, such as
counters or measurements on primary overload protection
equipment.
Operation
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