Extech

7742
Electrical Safety Compliance
Analyzer
Operation Manual

EXTECH Electronics Co., Ltd.
4F, NO.252,Nan Yang Street, Shih Chih City,
Taipei Hsien,221 Taiwan.

TEL: 886-26943030
FAX: 886-26947575
Website: http://www.extech-electronics.com

Printed in Feb.2006
EV 1.11

WARRANTY
EXTECH ELECTRONICS CO., LTD., certifies that the instrument listed in this manual meets
or exceedspublished manufacturing specifications. This instrument was calibrated using
standards that are traceable to Chinese National Laboratory Accreditation (CNLA).

Your new instrument is warranted to be free from defects in workmanship and material for a
period of (1) year from date of shipment. During the warranty period, you must return the
instrument to Extech Electronics Co., or itsbranches or its authorized distributor for repair.
Extech Electronics Co., reserves the right to use its discretion on replacing the faulty parts or
replacing the assembly or the whole unit.

Any non-authorized modifications, tampering or physical damage will void your warranty.
Elimination of any connections in the earth grounding system or bypassing any safety systems
will void thiswarranty. This warranty does not cover batteries or accessories not of Extech
manufacture. Parts used must be parts that are recommended by Extech as an acceptable
specified part. Use of non-authorized parts in the repair of this instrument will void the warranty.
This warranty does not cover accessories not of EXTECH manufacture.

Except as provided herein, EXTECH makes no warranties to thepurchaser of this instrument
and all other warranties, express or implied (including, without limitation, merchantability or
fitness for a particular purpose) are hereby excluded, disclaimed and waived.

TABLE OF CONTENTS
1. Introduction....................................................................................................................1
1.1. Safety Symbols........................................................................................................1
1.1.1. Product Marking Symbols ...............................................................................1
1.1.2. Caution and Warning Symbols ........................................................................1
1.2. Glossary ofTerms....................................................................................................2
1.3. Safety .......................................................................................................................3
1.3.1. Service and Maintenance.................................................................................3
1.3.2. Test Station......................................................................................................4
1.3.3. Test Operator ...................................................................................................5
1.3.4. Instrument Connections ...................................................................................5
1.3.5. Device Under Test ...........................................................................................6
1.3.6. Key Safety Pointsto Remember......................................................................6
1.4. Introduction to Product Safety Testing....................................................................6
1.4.1. The Importance of Safety Testing ...................................................................6
1.5. The Different Types of SafetyTests........................................................................7
1.5.1. Dielectric Withstand Test ................................................................................7
1.5.2. Insulation Resistance Test ...............................................................................9
1.5.3. Ground Bond Test..........................................................................................10
1.5.4. Run...