Extech Extech 480823 Manual

User's Guide

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Electromagnetic Field Meter
Model 480823

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

Introduction

Congratulations on your purchase of Extech’s Electromagnetic Field Meter, model 480823.
This battery powered meter measures and displays EMF in Gauss and Tesla units with a
frequency bandwidth of 30 to 300Hz. This professional meter, with proper care, will provide
years of safe reliable service.

Specifications

Display 0.5” (13mm) 3-1/2 digit (1999 count) LCD

with low battery and overload indication

Measurement rate Approx. 0.4 seconds
Maximum ranges and

resolution
Accuracy ± (4% + 3 digits) @ 50/60Hz

Frequency bandwidth 30 to 300Hz (single axis measurements only)
Over-range indication “1___” is displayed
Operating

Temperature/Humidity
Power source 9V Battery

Power consumption Approx. 3mA DC
Dimensions 5.2 x 2.8 x 1” (131 x 70 x 25mm)

Weight 0.36 lbs. (165g)

19.99µTesla (0.01) and 199.9mGauss (0.1)
NOTE: 1 µTesla = 10 milli-Gauss

Temperature: 32 to 122
RH: 90% max. (0 to 35°C); 80% max. (35 to 50°C)

o

F (0 to 50°C)

Meter Description

1. LCD display

2. EMF Sensor

3. Power/Units switch
Note that the tilt stand and battery

compartment are located on the rear of the meter

1

2

3

2

Model 480823 V2.1 12/07

Meter Operation

1. Place the “OFF/Tesla/Gauss” Switch to the Gauss or Tesla position.

2. Move the meter's sensor slowly toward the device under test and read the LCD
indication. If the LCD display is completely blank or if “LO BAT” appears on the left
corner of the LCD, check the 9V battery (replace if necessary).

3. Notice that the field intensity reading increases as you move closer to a field.

4. Position the meter at different angles to the device under test and observe how this
positioning affects the EMF readings.

5. Record the highest reading obtained from the various reading positions.

6. If the device under test is off, the EMF tester reading should go to zero unless another
source of radiation is present.

7. If the meter’s display indicates a “1” on the left side of the LCD, an overload condition
exists. This indicates that the measured radiation is higher than the capability of the
meter.

EMF Exposure

The effect of EMF exposure on humans and animals is a modern day concern. At the time
of this writing, to the best of our knowledge, no standards or recommendations exist
regarding limits of EMF exposure. Until evidence suggests that there is not a health risk
associated with EMF exposure, common sense would dictate that a practice of minimal
exposure be exercised.

Battery Replacement

When the low battery message “LO BAT” appears on the left corner of the LCD, the 9V
battery has fallen to a critically low voltage level and should be replaced as soon as
possible. The battery compartment cover is located at the bottom rear of the meter. Slide
off the battery compartment cover, change the battery, and replace the compartment
cover.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com