Maintenance - Extech Instruments 38394 User Manual

Data Hold
Press the HOLD key momentarily to freeze the present reading on the LCD.
appear in the display. Press the H key again to return to normal operation.
Relative (ZERO) Mode
The Relative mode permits the user to store a reference reading and compare all
subsequent readings to the stored reference value. Subsequent readings will display a
value that is the difference between the actual reading and the stored reference value.
1. Press the REL key when the desired valued is displayed on the meter. This
becomes the stored reference. The REL symbol will appear on the LCD.
2. Take measurements and note that the meter displays the actual reading minus the
reference reading.
3. Press the REL key to return to normal operation. The REL symbol will switch off.

Maintenance

WARNING: To avoid electrical shock or damage to the meter, keep moisture from entering
the meter housing. Also, remove the test leads before opening the meter
housing.
Cleaning
Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives
or solvents.
Battery Replacement
When the LCD display shows the battery symbol, replace the two 'AA' 1.5V batteries.
Accurate readings are possible for a short period of time after the battery symbol
appears, but it is recommended that the batteries be replaced immediately to ensure
accurate results. To replace the batteries, remove the rear battery 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 Care 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 Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Copyright © 2008 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
38394 V3.3 8/08
7
Hold will
www.burntec.com www.burntec.com