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IPC-TR-466

1995 Edition, April 1995

Complete Document

Wetting Balance Standard Weight Comparison Test

Includes all amendments and changes through Change/Amendment , April 1995


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INTRODUCTION

The wetting balance test method was the subject of much discussion during the preparation of ANSI/J-STD-O02, Solderability Tests for Components Leads, Terminations, Lugs, Terminals and Wires. Since no clear consensus was reached regarding the accept/reject criteria for the wetting balance test, the procedure was placed in a section of the standard reserved for tests without requirements. A Wetting Balance Task Group was chartered to refine the test procedure and derive acceptance test requirements.

The Wetting Balance Task Group established a four step strategy:

1. Study wetting balance weight measurement precision to establish correlation among all test users, and equipment manufacturers.

2. Develop standard test samples.

3. Study effects of surface finish and preparation, component geometry and thermal effects of fixtures.

4. Recommend a revised test procedure with acceptance test requirements.

This technical report discusses the results of the Task Group efforts to date on Step 1 of the strategy; establishing correlation among wetting balance test users.