480826

User Guide Three Axis Electromagnetic Field (EMF) Meter Model 480826 Introduction Congratulations on your purchase of Extech’s Model 480826 Electromagnetic Field (EMF) Meter. The Model 480826 is a battery powered meter that measures and displays EMF in Gauss and Tesla units with a frequency bandwidth of 30 to 300Hz. The 3 axis sensor allows for three component (xyz) measurement coverage. The Model 480826 is specifically designed to determine the magnitude of electromagnetic fields generated by power lines, computers electric appliances, televisions and many other similar devices. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Meter Operation 1. Press the POWER button to turn the meter ON. 2. Press the UNIT button to select either µTesla or mGauss units. 3. If the approximate range of the measurement is known, select the suitable meter range using the RANGE button. For unknown measurements, start with the highest range and work down through the ranges until the optimum range is reached. 4. Hold the probe by its handle and move it slowly toward the object under test. If the LCD display is completely blank or if the low battery symbol appears on the LCD, check the 9V battery. 5. Notice that the field intensity reading increases as you move closer to a field. 6. Use the XYZ button to read the EMF measurement in the X, Y, or Z axis. 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 currently selected range. Find the appropriate range using the RANGE button as described above. Measurement Notes Due to environmental electromagnetic interference the display may show small EMF values before testing. This is normal and due to the high sensitivity of the meter. Once a signal is detected by the sensor, the meter will display accurately. If the object under test is turned off in the middle of testing, the meter reading should fall close to zero unless a field from another source is detected. Data Hold feature To freeze a displayed reading, press the HOLD button. The DH display icon will switch on. To unlock the display and return to normal operation, press the HOLD button again. The DH indicator will switch off. Battery Replacement When the low battery icon 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. Remove the Phillips head screw that secures the battery compartment and slide off the battery compartment cover. Replace the battery and secure the compartment cover before use. 2 480826 V3.0 3/06 Meter Description 1. 2. 3. 4. 5. 6. 7. 8. 9. Sensor plug shown inserted in meter’s sensor jack LCD Display XYZ axis select button Manual Range button Power button Data Hold button Unit select button Sensor Sensor grip handle 10 11 5 6 12 13 7 9 2 8 1 3 4 10. Tripod mount 11. Pull-out tilt stand 12. Battery compartment access screw 13. Battery compartment cover OPEN Specifications Display Measurement rate Ranges and resolution 3-1/2 digit (2000 count) LCD Approx. 0.4 seconds 20µTesla (0.01) and 200mGauss (0.1) 200µTesla (0.1) and 2000mGauss (1) 2000µTesla (1) and 20,000mGauss (10) NOTE: 1 µTesla = 10 mGauss Accuracy (stated for 50/60Hz) ± (4%FS + 3 digits) for 20µTesla and 200mGauss ranges ± (5%FS + 3 digits) for 200µTesla and 2000mGauss ranges ± (10%FS + 5 digits) 2000µTesla & 20,000mGauss ranges Frequency bandwidth Over-range indication Operating Temperature/Humidity 30 to 300Hz “1___” is displayed Temperature: 32 to 122 F (0 to 50°C) o RH: 90% max. from 32 to 95°F (0 to 35°C); 80% max. from 95 to 122°F (35 to 50°C) 9V Battery Approx. 2.7mA DC Meter: 7.6 x 2.6 x 1.2” (195 x 68 x 30mm) Probe: 2.8 x 2.3 x 8.7” (70 x 58 x 220mm) 3 ft (1m) approx. 16.2 oz. (460g) including probe and battery 3 480826 V3.0 3/06 Power source Power consumption Dimensions Sensor Cable Length Weight EMF Exposure The effect of EMF exposure 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. Exposure limits of 1 to 3mG have been suggested by several international bodies. 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. Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be 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. 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. 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 Copyright © 2006 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. 4 480826 V3.0 3/06