4 42520es Ver. 1.7 8/00
6.2 High InfraRed Energy Disturbances
Objects having low emissivity and objects with low temperatures but high emissivity emit
little infrared energy. Because of this, measurements are adversely effected by powerful
infrared energy radiated from nearby objects having high emissivity or high temperature.
For example, when such objects are measured in sunlight, erratic measurements are
caused by powerful radiated energy from the sun reflected on the surface of an object.
6.3 Measurement Surface Hindrances
If the surface of an object to be measured is covered with frost, dust or other materials,
surface cleaning must be performed before accurate measurements can be made.
6.4
High Reflective Surfaces
If the surface of an object to be measured is highly reflective, apply masking tape or apply
flat black paint to the surface since this paint has a known emissivity value.
7. BATTERY REPLACEMENT
A flashing display indicates that the battery voltage has fallen into the critical region (6.5 to
7.5 V). Reliable readings can be obtained for several hours however, after the first
appearance of the low battery indication. Open the Battery compartment, replace the
battery, and close the compartment cover.
8. CALIBRATION / REPAIR SERVICES
Extech offers complete repair and calibration services for all of the products we sell. For
periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be performed
on an annual basis to insure calibration integrity.
9. 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 on 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 for authorization. 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.
Copyright
©
1999 Extech Instruments Corporation. All rights reserved
including the right of reproduction in whole or in part in any form.
