IPC TR-466

Abstract

<strong>INTRODUCTION</strong> <br>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. <br>The Wetting Balance Task Group established a four step strategy: <br>1. Study wetting balance weight measurement precision to establish correlation among all test users, and equipment manufacturers. <br>2. Develop standard test samples. <br>3. Study effects of surface finish and preparation, component geometry and thermal effects of fixtures. <br>4. Recommend a revised test procedure with acceptance test requirements. <br>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.