发明名称 |
Non-destructive method for evaluation of printed wiring boards |
摘要 |
A method for evaluating characteristics of a printed wiring board by measuring the alternating current impedance spectra of the printed wiring board conductor pattern. The method is useful in evaluating a number of different characteristics, such as moisture content, delamination, interlayer thickness and surface characteristics.
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申请公布号 |
US4939469(A) |
申请公布日期 |
1990.07.03 |
申请号 |
US19880226709 |
申请日期 |
1988.08.01 |
申请人 |
HUGHES AIRCRAFT COMPANY |
发明人 |
LUDWIG, FRANK A.;MCHARDY, JOHN |
分类号 |
G01R31/02;G01N27/20;G01R31/28;H05K3/46 |
主分类号 |
G01R31/02 |
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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