Avtron Model T477W Bonding Meter
with B14703 Battery Pack Replacement Instructions
Part Number T477WC15292
Calibration and Maintenance Procedures
Subject to the EAR, ECCN [9E610.a].
This information is subject to the export control laws of the United States, specifically including the Export Administration Regulations (EAR),
15 C.F.R. Part 730 et. seq. Transfer, retransfer, or disclosure of this data by any means to a non-U.S. person (individual or company), whether in the United States or abroad, without any
required export license or other approval from the U.S. Government is prohibited, including without limitation any diversion to a military end user or use in a military end use application.
4-4
4.6
Battery Testing
It is recommended that the T477W battery pack be periodically tested to identify problems before they become serious. One
method of testing the battery pack is to load it with 22 ohm, 2 watt resistor, and measure the terminal voltage. It should be 4
volts + or -0.2 volts for a fully charged battery. A better test to ensure battery capacity is to make a time-current test as
described in the Appendix, Section 7.
W A R N I N G
In order to retain Underwriter Laboratory certification and to permit safe use
in hazardous locations, replace defective batteries with Avtron part number
B14703 only.
Substitution of ordinary batteries for a defective battery pack may impair safe meter operation in a flammable environment.
The batteries and current limiting resistors contained in the Avtron battery pack are needed to ensure safety. The testing
procedures outlined in the appendix will be helpful in avoiding unnecessary replacement.
4.7
Meter Shutdown
The meter is supplied with a timer set to provide 52 seconds of operating time. This time may be lengthened or shortened by
Avtron Aerospace, Inc., during a calibration at no charge if requested.
