Battery Replacement; Calibration And Repair - Extech Instruments 407750 User Manual

Battery Replacement

When the low battery message appears on 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 resides at the rear of the meter. Remove the rear battery compartment screw and
remove the battery compartment cover, change the battery, and replace the compartment
cover.

Calibration and Repair

The meter includes a Calibration adjustment on the bottom of the meter. A sound level
calibrator must be used to complete a calibration. Extech can supply a calibrator for this
purpose. Once the Calibrator is affixed on the microphone, adjust the calibration screw so
that the LCD sound level display matches the calibrator's output signal.
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.
Tech support: Ext. 200; Email: support@extech.com
Repair/Returns: Ext. 210; Email: repair@extech.com
Copyright © 2004 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
Support Hotline (781) 890-7440
Website: www.extech.com
8 Model 407750 Version 2.1 February 2004