Extech Instruments EMF450 Manuale utente

USER MANUAL

Multi-Field EMF Meter

Model EMF450

Additional User Manual Translations available at www.extech.com

EMF450-en-GB_V1.47/17

Safety Information

CAUTIONS

•Before making a measurement, check if the low battery symbol is shown on the display

when the meter is switched on. Replace the battery if the symbol is displayed.

•In the case of prolonged storage, remove the battery from the meter to prevent damage.

•Do not expose this device to direct sunlight or to extreme temperatures and humidity.

•The accuracy and function of the meter may be adversely affected if the specified limits are exceeded or if

the meter is handled improperly.

•Clean the device with a soft, dry cloth. Moisture can damage the meter.

•Electric field measurement precautions: Perform tests according to the indicated directions.

WARNINGS

•Use caution when working in the vicinity of powerful radiation sources.

•Persons with electronic implants (e.g. cardiac pacemakers) should avoid powerful radiation sources.

•Observe all relevant safety regulations.

•Carefully read the operating instructions for equipment generating or conducting electromagnetic

energy that will be measured.

•Do not operate near combustible gases or in damp environments.

•Be aware that the field strength in the near vicinity of radiators increases proportionally to the inverse

cube of the distance. This means that enormous field strengths can result in the immediate vicinity of

small radiation sources (e.g. leaks in waveguides or inductive ovens).

•Field strength measurement devices can underrate pulsed signals, particularly with radar signals, in which

case significant measurement errors can result.

•All field strength measuring devices have a limited specified frequency range. Fields with spectral

components outside of this frequency range are generally incorrectly evaluated and tend to be

underrated. Before using field strength measuring devices be certain that all field components to be

measured lie in the specified frequency range of the measuring device.

•For indoor use; Pollution level II

•Operating altitude below 2000’ (6562’)

EMF450-en-GB_V1.47/17

Introduction

This meter simultaneously measures and displays Magnetic Field, Electric Field, and RF Strength.

The unit of measurement and the measurement types are expressed in units of electrical and

magnetic field strength and power density. This meter is ideal for EMF measurements of power

lines, electrical appliances, industrial devices, cell phones, base stations, and microwave leakage.

This device is shipped fully tested and calibrated and, with proper use, will provide years of

reliable service. Please visit our website (www.extech.com) to check for the latest version of this

User Guide, Product Updates, Product Registration, and Customer Support.

Features

•Data hold (HOLD)

•Overload display “OL”.

•Brightness options: low-medium-high

•Selectable Auto Power off (APO) Time: 1; 3; 5; 10; 15; 30 minutes

•Key press Sounds / Alarm Sounds: On ; Off with programmable tone selections

•Information screen shows software version

•Languages: English, Traditional Chinese, Simplified Chinese, Japanese, Spanish

•Magnetic units selection：Gauss (mG) or Tesla (μT)

•Electric field strength: V/m

•RF Strength Units selection: (μW/m² ~mW/m²) (μW/cm²) (m V/m ~V/m) (mA/m) (dBm).

•Low-Frequency EMF Readings: Individual and aggregated XYZ axial readings:

•High-frequency EMF Readings

•RF Historical Records; up to 20 groups.

•Low battery indication：HIGH LOW

EMF450-en-GB_V1.47/17

Definitions

Electromagnetic Radiation

This meter is used to indicate radiated electromagnetic fields wherever there is a voltage,

current, electric (E) or magnetic (H) field. Examples include the electromagnetic fields from

radio broadcasting, TV transmitters and power lines.

Electric Field Strength

This is a field vector quantity that represents the force (F) on an infinitesimal unit positive

test charge (q) at a point divided by that charge. Electric field strength is expressed in units

of volts per meter (V/m). Use the units of electric field strength for measurements in near-

field power measurements.

Magnetic field strength (H)

This is a field vector that is equal to the magnetic flux density divided by the permeability of

the medium. Magnetic field strength is expressed in units of amperes per meter (A/m).

This measurement is for near-field power measurements.

Power density (S)

Power per unit area in the direction of propagation; usually expressed in units of watts per

square meter (W/m2) or, for convenience, milli-watts per square centimeter (mW/cm2).

The characteristic of electromagnetic fields

Electromagnetic fields propagate as waves and travel at the speed of light (c).

The wavelength is proportional to the frequency.

λ(wavelength) =

c (speed of light)

f (frequency)

Near-field is assumed if the distance to the field source is less than three wavelengths. For

far-fields, the distance is more than three wavelengths. In the near-field, the ratio of

electric field strength (E) and magnetic field strength (H) is not constant, so measure each

separately. In the far-field, however, it is enough to measure one field quantity, and

compute the other accordingly.

Descriptions

Front Panel Description

1. 2.4” Color TFT display (240*320 resolution)

2. Select and Down button

3. Power and Menu button

4. Hold and Enter button

5. Battery compartment cover and

measurement chart on back of meter

Figure 1 – Meter Description

EMF450-en-GB_V1.47/17

Display description

1. Data Hold

2. Auto power off (APO)

3. Audible alert

4. Battery status

5. Magnetic Field bargraph

6. Magnetic Field digital reading

7. XYZ axes values

8. Electric Field bargraph

9. Electrical Field digital reading

10. RF strength bargraph

11. RF strength histogram display

12. Select

13. Menu

14. Hold / Enter

15. RF electronic field color alert*

16. RF strength digital reading

17. RF Strength indication area

18. LF Electrical field color alert*

19. Electrical field indication area

20. LF electromagnetic field color alert*

21. Magnetic field indication area

*Color Coded Alert Table (for reference purpose only) see items 16, 19, and 21 above.

Magnetic Fields

Electrical Fields

RF Strength

Low 0~10.00mG 0~500V/m 0~0.99mW/m2

(0~0.59V/m)

Medium 10.01~100mG 501~1000V/m 1~9.99 mW/m2

(0.6~1.9V/m)

High

101~2000mG

>1001V/m

>10 mW/m

(>2V/m)

Note: Alarm beeper sounds when readings enter the red region.

Conversions

1W/m² = 0.1mW/Cm² = 100μW/Cm². 1mW/m² = 0.1μW/Cm²

Figure 2 – Display Description

EMF450-en-GB_V1.47/17

Operation

Power ON/OFF

1. Press the power button to power the meter. The display will show the main

measurement screen. If the meter does not power on, check that the batteries are

installed correctly and are fresh (see battery installation/replacement section later in

this guide).

2. Press and hold the Power button for 3 seconds to power off the meter.

Data hold (HOLD)

Press the HOLD button to freeze the current readings on the display. The HOLD display icon

will appear when this mode is active. To release the data press the HOLD button again.

Electric Field Measurements

The EM450 measures the electric field (Electrical Power) in the atmosphere of the sensor’s

surroundings. The sensor orientation is printed on the back of the meter.

Perform all tests according to the indicated direction of the electric field sensor.

Hold the meter at the bottom and at arm’s length, as shown in Figure 3.

Figure 3 – Orienting the meter for Electrical Field Measurements

EMF450-en-GB_V1.47/17

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.

EMF450-en-GB_V1.47/17

Menu Settings

1. Momentarily, press the center MENU key to enter the main menu.

2. Press the right SELECT key to cycle through the list.

3. Press the left ENTER key to enter the selected option.

4. Use the right SELECT key to choose the desired setting.

5. Press the left ENTER key to confirm the setting, the meter will exit the menu unless there

are more settings required for the given parameter (as in the SOUND setting); in which case

continue using the keys in the same manner as described in this section.

6. From the Main Menu screen (Figure 4), the MENU key can be used to exit the Main Menu.

Figure 4 – Main Menu Option Screen

Brightness: Low, Middle, High

Magnetic unit: Gauss/mG, Tesla/ µT

(Used for testing Electrical power (50/60Hz))

RF strength unit: µW/m²-mW/m², µW/cm², mV/m-V/m, mA/m, and dBm

(Used for testing RF energy from 50MHz to 3.5GHz)

Language: English, Traditional Chinese, Simplified Chinese, Japanese, Spanish

Power OFF (Auto):NO (OFF), 1, 3, 5, 10, 15, 30 (minutes). Factory default is 5 minutes.

Sound: Enable/Disable

when ‘enable’ is selected, the keys/alarm sound menu will open.

Keys: 3 options (1, 2, or 3) represent alternate keystroke sounds.

Alarm: 3 options (1, 2, or 3) represent alternate alarm sounds.

Information: Displays the software version

EMF450-en-GB_V1.47/17

Battery Installation and Replacement

Battery Installation

Remove the rear battery cover and insert three (3) 1.5V AAA batteries observing correct

polarity.

Figure 5 Battery Installation

Battery Replacement

The battery status icon shows low energy when the battery voltage drops below the

operating level. See installation instructions above for battery insertion.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate

collection sites, the retail store where the batteries were purchased, or wherever

batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is

obligated to take end-of-life devices to a designated collection point for the disposal

of electrical and electronic equipment.

Other Battery Safety Reminders

oNever dispose of batteries in a fire. Batteries may explode or leak.

oNever mix battery types. Always install new batteries of the same type.

EMF450-en-GB_V1.47/17

Specifications

Sensor Type: LF - Magnetic Fields

Range: 20mG /200mG /2000mG, 2µT /20µT /200µT

Display resolution: 0.02/0.1/1

Frequency range: 50/60Hz

Accuracy: ± (15% + 100 digits)

Sensor Type: LF- Electric Field Sensor

Range: 50V/m to 2000V/m

Display resolution: 1V/m

Frequency range: 50/60Hz

Accuracy: ± (7% + 50 digits)

Sensor Type: RF Strength

Range: 0.02µW/m² to 554.6mW/m²

0.02µW/cm² to 55.4µW/cm²

36.1mV/m to 14.46V/m

0.02mA/m to 38.35mA/m

-51dB to 16dBm

Display resolution: 0.02µW/m², 0.2µA/m, 0.2mV/m, 0.002µW/cm², 2dB

Frequency range: 50MHz to 3.5GHz

Accuracy: ± 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

Over range condition: The EM450 is equipped with three individual aerial

sensors to measure EMF. Overload indication (OL)

applies to all three axes (X, Y, and Z)

Battery: Three (3) 1.5V alkaline batteries

Battery Life: Approx. 8 hours

Alarm: Beeps when readings are in the red display region

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: Approx. 120g (4.2 oz.)

Dimensions: 115 x 60 x 21mm (4.5 x 2.4 x 0.08”)

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