Avtron T477W Manual
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Avtron T477W Manual

Bonding meter with b14703 battery pack
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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.
To buy, sell, rent or trade-in this product please click on the link below:
https://www.avionteq.com/Avtron-T477W-Bonding-Meter
www.avionteq.com
...........................................................................................................................
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Note: Revisions on August 28, 2018, February 21, 2018,
August 4, 2014, April 18, 2014, January 5, 2012, and
November 23, 2009 affected formatting and company
name
changes.
Last
information was dated June 15, 2004.
T.O. 33DA39-71-1
Avtron Model T477W
Part Number T477WC15292
Copyright © 2012 Avtron Aerospace, Inc.
change
affecting
technical
Avtron Aerospace, Inc.
Bonding Meter
with B14703 Battery Pack
Replacement Instructions
December 11, 1981
Revised August 28, 2018

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Summary of Contents for Avtron T477W

  • Page 1 ........................... December 11, 1981 Revised August 28, 2018 Copyright © 2012 Avtron Aerospace, Inc. Note: Revisions on August 28, 2018, February 21, 2018, August 4, 2014, April 18, 2014, January 5, 2012, and November 23, 2009 affected formatting and company name changes.
  • Page 2 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.
  • Page 3 PROPRIETARY NOTE This document contains information PROPRIETARY to Avtron Aerospace, Inc. It is furnished solely to provide information sufficient for instruction, operation, maintenance, evaluation, and testing of the equipment herein disclosed; is not to be used for manufacturing or procurement; and is not to be disclosed to anyone other than persons in the Division, or the Company, or the Government, as the case may be, responsible for action relating to this document without the express written permission of Avtron Aerospace, Inc.
  • Page 4 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.

  • Page 5: Table Of Contents

    Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Table of Contents Table of Contents DESCRIPTION ..................................1-1 OPERATING INSTRUCTIONS............................. 2-1 Initial Operation ................................. 2-1 Battery Charging ................................ 2-1 Probes ..................................2-1 Minimizing Error Contributed by Probes ........................2-2 C22161 Probe Set ...............................
  • Page 6 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Table of Contents ESD PRECAUTIONARY GUIDELINES ..........................9-1 REPLACEMENT PARTS LIST ............................10-1 10.1 Introduction ................................10-1 10.2 Reference Designators .............................. 10-1 Table of Figures Figure 2-1. Two Pistol Grip Probes with a Pair of Probe Tips ..................... 2-2 Figure 2-2.

  • Page 7: Description

    T477W batteries. The T477W Bonding Meter is certified by Underwriter Laboratories per UL 913 as an intrinsically safe device for use in hazardous locations, Class I--Group A, B, C, or D. These locations are identified by the National Electrical Code, National Fire Protection Association (NFPA) document number 70, and are typified by the presence of flammable vapors such as hydrogen, propane, methane, and gasoline.
  • Page 8 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Description 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.

  • Page 9: Operating Instructions

    Operating Instructions OPERATING INSTRUCTIONS Initial Operation The T477W Bonding Meter is shipped with charged batteries. If the meter is not used for a period of 30 days following shipment, the batteries should be charged before use. Battery Charging Batteries are recharged by disconnecting the probe from the input connector J1 and connecting the battery charger B15693 to connector J1.

  • Page 10: Minimizing Error Contributed By Probes

    Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Operating Instructions C A U T I O N Probes are equipped with sharp points. Exercise caution when handling probes to prevent puncture wounds or scratches.

  • Page 11: C15479 Probe Set (Optional)

    The best-rated meter accuracy is obtained with this probe set when connected such that the meter reading is positive only. This probe set may be used for calibrating the T477W Bonding Meter and whenever measurement accuracy is crucial. NOTE The red clamp and pencil style probe are positive current and voltage respectively while the black clamp and pencil style probe are negative current and voltage respectively.

  • Page 12: C15478 And C15480 Probe Sets (Optional)

    The best-rated meter accuracy is obtained with this probe set when connected such that the meter reading is positive only. This probe set may be used for calibrating the T477W Bonding Meter and whenever measurement accuracy is crucial.

  • Page 13: Meter Operation

    Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Operating Instructions 2.10 Meter Operation Select one of the five probes and connect it to the front panel J1. In making a measurement, make sure that the probe tips penetrate any non-conductive film that may be present (and there are no flashing decimal points or erratic digits flickering in the display).

  • Page 14: Battery Endurance

    10 days prior to the time of operation. New batteries (100% capacity) are anticipated to have sufficient energy to make twice the rated measurements. Because the T477W has a built-in timer for automatic shutdown after 52 seconds, "Continuous Operation"...

  • Page 15: Circuit Description

    CIRCUIT DESCRIPTION The T477W is designed to measure values of resistance from 2000 milliohms to less than 0.2 milliohms. Connections to the unknown resistance are made by four wire (Kelvin) connections that consist of two current and two voltage sensing leads. The meter circuit provides a regulated alternating current @ 78 Hz that is fed through the unknown resistance while the voltage generated across that unknown resistance is sensed.
  • Page 16 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Circuit Description 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.

  • Page 17: Calibration And Maintenance Procedures

    Follow the table below to verify the accuracy of the Bonding Meter. For each K777 switch position in column one, set the T477W to the range in column two by pressing the test button. Read the T477W display and compare to desired value.
  • Page 18 Factory repair is available at additional cost if required. Prior to sending equipment to Avtron Aerospace, Inc., for calibration or service, please contact us to receive an RMA number and instructions on where to send the items. Please visit our website for contact and product information at http://www.avtronaero.com/rma.htm.

  • Page 19: Calibration Period Or Frequency

    The T477W is powered by rechargeable nickel cadmium batteries. The battery pack is the most likely component in the T477W to require maintenance. The pack is potted to ensure proper operation of current limiting resistors which were required for safety certification by Underwriter Laboratories. The potting makes battery replacement awkward and expensive, but it is necessary for safety.

  • Page 20: Battery Testing

    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.

  • Page 21: Troubleshooting

    Problems with the battery pack are relatively easy to diagnose and correct. Access to the T477W battery pack is achieved by removing two screws located on the back of the meter case and separating the front panel from the case. The battery is the large blue/black panel labeled B14703, located in the middle of the bottom circuit board.
  • Page 22 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Troubleshooting 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.

  • Page 23: Battery Charging

    Batteries located within the T477W Bonding Meter are charged from external power supply B15693. Connections from the power supply to the T477W are made through the front panel connector J1 and prevent the use of the Bonding Meter during charging. This procedure is necessary because the power supply is not rated for use in hazardous locations.
  • Page 24 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Battery Charging 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.

  • Page 25: Appendix - Battery Testing

    Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Appendix - Battery Testing APPENDIX - BATTERY TESTING Figure 7-1. Battery Test Schematic BATTERY TESTING Recharge the battery pack overnight to assure full charge. Battery may remain on the circuit board with the meter display off.
  • Page 26 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Appendix - Battery Testing Batteries failing the discharge test may have a memory problem. A battery pack that has a memory problem may be restored to a useable state by repeating the charge/discharge cycle described in steps 1 through 6. Usually batteries require more than one recycle to regain normal capacity.

  • Page 27: B14703 Battery Pack Replacement Instructions

    B14703 BATTERY PACK REPLACEMENT INSTRUCTIONS The B14703 Battery Pack is a UL approved replacement for use in the Avtron T477W Bonding Meter. The use of other Battery Packs voids UL certification and may impair intrinsic safety for meter use in hazardous locations.

  • Page 28: Figure 8-1. Battery Pack Location

    Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 B14703 Battery Pack Replacement Instructions Figure 8-1. Battery Pack Location Check Battery Pack identification terminal numbers. They must be located adjacent to similar numbered connecting wires; that is, 1 goes to 1, 2 goes to 2, 3 goes to 3, and 4 goes to 4.

  • Page 29: Esd Precautionary Guidelines

    Discharge non-electric tools before use. • Pack ESD items in static shielding containers before shipping them to Avtron for repair. * Styrofoam® is a registered trademark of Dow Chemical. 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.
  • Page 30 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 ESD Precautionary Guidelines 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.

  • Page 31: 10 Replacement Parts List

    10 REPLACEMENT PARTS LIST 10.1 Introduction The parts list in this section contains the description, quantity required, and Avtron part numbers for each listed part. The list also includes, where appropriate, schematic reference designators to facilitate parts identification. NOTE Every effort has been made to ensure the accuracy of this information. However, changes are sometimes necessary and revisions to the parts list may be made at any time without notice.
  • Page 32 Avtron Model T477W Bonding Meter with B14703 Battery Pack Replacement Instructions Part Number T477WC15292 Replacement Parts List REPLACEMENT PARTS LIST SCHEMATIC AVTRON QTY/ DESCRIPTION REFERENCE UNIT AVTRON MODEL T477W C15292 BONDING METER .Charging Unit B15693 ..Adapter (European) A14166 .Battery Assembly B14703 .Probe Set...
  • Page 33 Division, or the Company, or the Government, as the case may be, responsible for action relating to this document without the express written permission of Avtron Aerospace, Inc.
  • Page 34 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.
  • Page 35 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.
  • Page 36 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.
  • Page 37 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.
  • Page 38 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.

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