FEA and Strain Gauge Testing

Strain Gauge Testing

Circuit Check began Strain Gauge Testing in 1999 when BGA/SMT technology started replacing PTH components, reducing strain levels was a reactive post fixture fabrication process.  We quickly recognized that the “reactionary” process was neither efficient nor were we capable on knowing the lowest achievable strain levels.  Our engineering team came up with visual tools utilized during design to easily identify areas of excessive probe force, though still not enough data was generated to identify the lowest possible strain.  Finite Element Analysis software models the PCBA and test fixture and applies the pressures from test probes and board supports and indicates the micro strain level applied to the PCBA.  Using the FEA software during our design process allows our engineers to modify fixture designs to attain the lowest possible micro strain before fabrication begins.

Our leadership role with FEA services and Strain Gauge Testing was recognized by IPC/JEDEC with participation in the IPC/JEDEC-9704A task group responsible for updating the standard.  The exposure to a broad range of industry experts and our seamless use of FEA and strain gage processes permeate each fixture we fabricate.

Test results may lead to the following mechanical modifications of the product test fixture. This helps to reduce strain on the product during actual test:

  • Additional board supports
  • Reinforcement of fixture structure
  • Redistribution of probe locations
  • Lower probe spring forces in limited areas

Strain gauge testing often is performed when:

  • High concentrations of probes under BGA’s or fragile components exist
  • The UUT is larger than 200 in sq
  • Fixture has > 2200 probes
  • High or Extra high spring force probes are utilized
  • If a component has a strict warranty policy

Circuit Check delivers a fully detailed strain gauge report for comparing test results to the industry standard IPC/JEDEC 9704.

In-Circuit Test Fixtures Products

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