Extech Instruments EMF450 User Manual

EMF450-en-GB_V1.4 7/17
7
Low Frequency EMF Readings (Magnetic field)
Point the front section of the meter toward the desired electromagnetic field to take a
measurement. The meter simultaneously displays the electromagnetic field readings of
individual (XYZ) and the aggregated Magnetic field readings.
The aggregated calculation equation is expressed as:
Due to environment related magnetic field factors, this electromagnetic field (EMF) meter
may display a reading of under 0.50mG prior to testing. This is caused by the magnetic noise
in the environment, rather than meter failure.
The Magnetic and Electric field will also display a bar indicator based on the measured value.
Important: If the sensor is moved quickly, excessive field strength values will be displayed
which do not reflect the actual field conditions. This effect is caused by electrostatic charges.
Measurement considerations:
1. Hold the meter at arm’s length.
2. Point the front face of the meter toward the source of power.
3. Hold the meter steady during the measurement.
4. Make several measurements at various locations in the work place or other areas of
interest. This is particularly important if the field conditions are unknown.
5. Pay special attention to measuring the neighboring vicinity for possible radiation sources.
Apart from active sources, those components connected to a source may also act as
radiators.
For example, the cables used in diathermy equipment may also radiate electromagnetic
energy.
Note that metallic objects within the field may locally concentrate or amplify the field
from a distant source.
RF strength meter readings
Point the front face of the meter toward the desired RF field to take a measurement.
The RF signal strength will be displayed with the units of measure set from the menu mode.
The RF strength portion of the display will also show a RF strength history histogram and a
bar indicator based on the measured value.
Measurement considerations:
1. Hold the meter at arm’s length.
2. Point the front face of the meter toward the source of power.
3. Hold the meter steady during the measurement.

Extech Instruments EMF450 Specifications

General

Sensor Type	LF - Magnetic Fields, LF- Electric Field Sensor, RF Strength
Range	20mG /200mG /2000mG, 2µT /20µT /200µT, 50V/m to 2000V/m, 0.02µW/m² to 554.6mW/m²
Display resolution	0.02/0.1/1, 1V/m, 0.02µW/m², 0.2µA/m, 0.2mV/m, 0.002µW/cm², 2dB
Frequency range	50/60Hz, 50/60Hz, 50MHz to 3.5GHz
Accuracy	± (15% + 100 digits), ± (7% + 50 digits), ± 2dB at 2.45GHz
Display	4 digits Triple color TFT display
Sample rate	6 seconds
Sensors	Triple axes (XYZ) ELF and RF and Electric field sensor
Battery	Three (3) 1.5V alkaline batteries
Battery Life	Approx. 8 hours
Operating temperature and RH%	5°C~40°C (41°F ~104°F); < 80%RH
Storage temperature and RH%	-10°C to 60°C (14°F ~140°F); < 70%RH

Weight and Dimensions

Weight	Approx. 120g (4.2 oz.)
Dimensions	115 x 60 x 21mm (4.5 x 2.4 x 0.08”)