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   ENGINEERING COMMITTEE
  Interface Practices Subcommittee




  American National Standard



      ANSI/SCTE 29 2007




Torque Requirements for Bond Wire
 Penetration of Bonding Set Screw
                                        NOTICE

The Society of Cable Telecommunications Engineers (SCTE) Standards are intended to
serve the public interest by providing specifications, test methods and procedures that
promote uniformity of product, interchangeability and ultimately the long term reliability
of broadband communications facilities. These documents shall not in any way preclude
any member or nonmember of SCTE from manufacturing or selling products not
conforming to such documents, nor shall the existence of such standards preclude their
voluntary use by those other than SCTE members, whether used domestically or
internationally.

SCTE assumes no obligations or liability whatsoever to any party who may adopt the
Standards. Such adopting party assumes all risks associated with adoption of these
Standards or Recommended Practices, and accepts full responsibility for any damage
and/or claims arising from the adoption of such Standards or Recommended Practices.

Attention is called to the possibility that implementation of this standard may require use
of subject matter covered by patent rights. By publication of this standard, no position is
taken with respect to the existence or validity of any patent rights in connection
therewith. SCTE shall not be responsible for identifying patents for which a license may
be required or for conducting inquires into the legal validity or scope of those patents that
are brought to its attention.


Patent holders who believe that they hold patents which are essential to the
implementation of this standard have been requested to provide information about those
patents and any related licensing terms and conditions. Any such declarations made
before or after publication of this document are available on the SCTE web site at
http://www.scte.org.


                                    All Rights Reserved

              © Society of Cable Telecommunications Engineers, Inc. 2007
                                   140 Philips Road
                                   Exton, PA 19341




                                              i
          TABLE OF CONTENTS


                              Page

      FOREWORD                 i

      TABLE OF CONTENTS        ii

1.0   SCOPE                    1

2.0   EQUIPMENT                1

3.0   TEST SAMPLES             1

4.0   TEST METHOD              1

5.0   MEASUREMENTS AND         2
      CALCULATIONS

6.0   TEST RESULTS             2




                     ii
1.0   SCOPE

            This test procedure is to determine the mechanical force needed to penetrate
            bonding wire to the appropriate depth. Bonding wire penetration should be
            25 +/-1% of wire O.D.


2.0   TEST EQUIPMENT
      2.1   Wright Tools Torque Wrench model 2471 or equivalent

      2.2   Square drive socket to fit bonding screw heads


3.0   TEST SAMPLES
      3.1   6 ea. drop bonding blocks (3 different manufacturers)

      3.2   6 ea. subscriber splitters (3 different manufacturers)

      3.3   Bonding wire: 12 each 4 inch long pieces of #6, # 10, #12 and #14 bare copper


4.0   TEST METHOD
      4.1   Mount unit under test in a vice or attach unit to a stationary object using screws
            and holes built into product for said purpose.

      4.2   Using torque wrench and an appropriately sized socket, slowly tighten screw
            onto bonding wire, contacting firmly but not penetrating the wire.

      4.3   Tighten screw, depending on wire diameter and screw thread, by the rotation
            angle noted below. This rotation corresponds to 25 +/-1% wire penetration.

            For 32 threads per inch or 0.8mm pitch bonding screws:
            #6 wire: 470º, #10 wire: 300º, #12 wire: 230º, #14 wire: 180º

            For 24 threads per inch or 1.0mm pitch bonding screws:
            #6 wire: 360º, #10 wire: 230º, #12 wire: 180º, #14 wire: 140º

            Note the torque just as the rotation limit is reached, and record. Repeat for all
            samples.




                                             1
5.0   MEASUREMENTS AND CALCULATIONS

      5.1   Bond wire typical diameters:

            Type                      O.D. (TYPICAL)

            # 6            =          .1610"

            TW10           =          .1050"

            TW12           =          .0800"

            TW14           =          .0635"

      5.2   Penetration of 25 +/-1%

            Wire Size      O.D.                25% Penetration    24% to 26% penetration

            #6             .1610"              .040"              .038 to .041"

            TW10           .1050"              .026"              .025 to .027"

            TW12           .0800"              .020"              .019 to .021"

            TW14           .0635"              .0158"             .015 to .0165"


6.0   TEST RESULTS
            Sample #                  Torque at end of rotation




                                               2