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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