Dual stage vacuum chamber with full circuit board support
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United States of America Patent
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Jun 17, 2014
Grant Date -
Oct 17, 2013
app pub date -
Apr 11, 2012
filing date -
Apr 11, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A dual-stage fixture for a circuit tester includes a slide plate that can be slid between at least a first position and a second position. In the first position, an upper stripper plate is spring-loaded, and a full set of test probes, including both long-stroke and short-stroke probes, can contact the circuit board or UUT (unit under test). In the second position, the upper stripper plate becomes fixed in position, and only the long-stroke probes can contact the circuit board. The fixed positioning of the upper stripper plate prevents the short-stroke probes from contacting the circuit board even when there is unbalanced loading of probe pressure between the top and bottom of the circuit board, thereby preventing transient signals from interfering with testing. In addition, a vacuum is applied in this position during a non-powered test.
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