Westfalia 82 04 51 Instruction Manual page 50

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.
Caution! The maximum allowable input voltage of this unit is 600
V (CAT III) and must not be exceeded.
Important! Before working with the digital clamp meter check the
measuring cable. Do not use them in case of damage. Have
them replaced immediately.
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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