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      Complex Electronic Product Design and Prototyping
      237 East Main St. Gloucester, MA   01930
      Phone: 978-219-9009
      Email: designinfo@henning-eng.com

      We design, build, and seamlessly integrate electronic, electro-mechanical, and
      opto-mechanical hardware


      Informative Links

      Portfolio of

      Example Projects

      8 Site Angular MEMS Accelerometer Test Fixture Project

      Shown below are some pictures of components for a multi-site production test fixture we designed for testing angular MEMS accelerometers.   This fixture was designed from the ground up.   When viewing the pictures keep in mind that for any inertial test fixture, including this one, one of the most important design goals is maximizing the modulus to density ratio of the fixture.   What this means is that you are trying to maximize the mechanical stiffness while at the same time trying to keep the fixture as light as possible.   The engineer must use his PCB design skills to make the smallest pc board possible while also properly working with the mechanical design to make sure all the mechanical constraints such as proper DUT clamping, fixture mass, pcb mounting screw sizes and locations are met.   These pictures illustrate how useful the value of combined electrical/mechanical skills are when designing such a project.

      8 Site Angular MEMS Accelerometer Test Fixture

      Front view of test fixture.   The test fixture is the round cylindrically shaped object in the center.   The fixture is mounted on an oil bearing and rotates.   The shaker, whose armature can be seen in the back, provides the stimulus to the fixture.

      8 Site Angular MEMS Accelerometer Test Fixture

      Side view of the fixture showing the flex cables which provide all electrical connections to the fixture.

      8 Site Angular MEMS Accelerometer Test Fixture base

      Base of test fixture on left and base with contactor board installed.   The DUTs are the SO package ICs shown in the center.   The fixture provides electrical contact to the DUTs via the contactor PCB shown on the right.   Since this is a fixture for angular accelerometers the parts are situated in a radial pattern.

      8 Site Angular MEMS Accelerometer Test Fixture Top

      Top clamp plate, base and pneumatic clamping cylinder shown before assembly.

      8 Site Angular MEMS Accelerometer Test Fixture Carrier

      Top and bottom view of the carrier that holds the DUTs in place on the contactor.   Top view on left has MEMS accelerometers in place.

      8 Site Angular MEMS Accelerometer Test Fixture Carrier Bottom

      Close up view of bottom of carrier.   DUTs are in place and their leads can be seen.

      8 Site Angular MEMS Accelerometer Test Fixture Carrier Close Up

      Close up view of top of carrier.

      8 Site Angular MEMS Accelerometer Test Fixture Contactor

      Top view of contactor board.

      8 Site Angular MEMS Accelerometer Test Fixture Contactor Close Up

      Close up of contactor board and base.   Fit and design of mechanical and electrical components is seamless.


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