Measuring Units; Measuring Categories - Wetekom 81 52 69 Bedienungsanleitung

mV, V
µA, mA, A
Ω, kΩ, MΩ
F, nF, µF
°C
Hz, kHz, MHz
%
Lux
dB
%RH

Measuring Categories

The measuring category CAT I 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.
The measuring category CAT III is intended for taking measurements on
house installations. Examples for this are measurements on switches,
power sockets, distribution boxes, circuit breakers, wiring, terminal strips
and connection boxes on fixed house installation, but also for measure-
ments 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.

1.3 Measuring Units

Voltage unit, mV: Millivolt, V: Volt, 1 V=10
Current unit, µA: Microampere, mA: Milliampere, A: Ampere,
3
1 A = 10 mA = 10
Resistant unit, Ω: Ohm, kΩ: Kiloohm, MΩ: Megaohm,
3
1 MΩ = 10 kΩ = 10
Capacitance unit, nF: Nanofarad, µF: Microfarad, F: Farad,
6
1 F = 10 µF = 10
Temperature unit, °C: Celsius degree
Frequency unit, Hz: Hertz, kHz: Kilohertz, MHz: Megahertz,
3
1 MHz = 10 kHz = 10
Used for duty cycle measurement. %: Percent
Unit of illumination, lx: Lux
Unit of sound measurement
Unit of relative humidity, %: Percent
6
µA
6
Ω
9 12
nF = 10 pF
6
Hz
33
3
mV