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User's Guide
Electromagnetic Field Meter
Model 480823
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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.
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to b e free of defects
in parts and workmanship for one year from date of shipment (a six month limited warranty
applies to sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact
information. A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects
resulting from action of the user such as misuse, improper wiring, operation outside of
specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific
purpose and will not be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product. The warranty set
forth above is inclusive and no other warranty, whether written or oral, is expressed or
implied.
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
20µTesla (0.01) and 200mGauss (0.1)
NOTE: 1 µTesla = 10 milli-Gauss
Accuracy ± (4% + 3 digits) @ 50/60Hz
Frequency bandwidth 30 to 300Hz (single axis measurements only)
Over-range indication “1___” is displayed
Operating
Temperature/Humidity
Temperature: 32 to 122
o
F (0 to 50°C)
RH: 90% max. (0 to 35°C); 80% max. (35 to 50°C)
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)
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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
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.
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Support line (781) 890-7440
Technical support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
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.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Service Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
Copyright ©
2005 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
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