Measuring Categories; Taking Measurements - Westfalia 99 31 54 Instruction Manual

Operation
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

The measuring category CAT I is intended for taking measure-
ments on circuitry not directly connected to the power mains.
The measuring category CAT II is intended for taking measure-
ments on low-voltage circuitry. Examples for this are household
appliances, mobile electric devices or similar equipment.
The measuring category CAT III is intended for taking measure-
ments on house installations. Examples for this are measure-
ments on switches, power sockets, distribution boxes, 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 measure-
ments on sources of low-voltage installation, such as counters or
measurements on primary overload protection equipment.

Taking Measurements

Attention! When taking alternating current measurements (AC),
the measuring cables must be removed from the unit.
For all other measurements please use the provided measuring
cables.
First connect the black measuring cable to the COM input (6) and
then connect the red measuring cable to the V/Ω/ input (5).
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