发明名称 |
Determination of surface, insulation resistnace of printed circuit boards. |
摘要 |
To determine the stabilized surface insulation resistance (SIR) of a printed circuit board substrate a test printed circuit board is provided which has desirable clean surface conditions. This surface which bears a predetermined circuit board test pattern (10) has a known SIR characteristic resulting in a known stabilized SIR. The test board is then subjected to a soldering step which, in practice, is performed in the in-line production with commercial boards. After the soldering step, the SIR characteristic of the soldered test board is determined for a time period sufficient for comparison with the SIR characteristic of the clean test board to enable the stabilized SIR of the soldered test board to be determined. <IMAGE> |
申请公布号 |
EP0657744(A2) |
申请公布日期 |
1995.06.14 |
申请号 |
EP19940308957 |
申请日期 |
1994.12.02 |
申请人 |
NORTEL NETWORKS CORPORATION |
发明人 |
PETERSON, JOHN P.;FOX, RANDAL T.;SZYMANOWSKI, RICHARD A. |
分类号 |
G01R31/12;G01R31/28;H05K1/02;(IPC1-7):G01R31/28 |
主分类号 |
G01R31/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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