Measuring Units; Measuring Categories - Wetekom 81 83 50 Bedienungsanleitung

mV, V
μA, mA, A
Ω, kΩ, MΩ

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.

1.2 Measuring Units

Voltage unit, mV: Millivolt, V: Volt, 1 V=10
Unit for strength of current, μA: Microampere,
mA: Milliampere, A: Ampere,
3
1 A = 10 mA = 10
Resistance unit, Ω: Ohm, kΩ: Kiloohm, MΩ:
Megaohm, 1 MΩ = 10
6
μA
3 6
kΩ = 10
26
3
mV
Ω