MG11 
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STEP Prototype Development

STEP Prototype Development

We report on recent progress in the development of STEP (Satellite Test of the Equivalence Principle) prototype flight accelerometers. We have assembled for the first time a nearly complete set of quartz housings (5 components) for an engineering model inner accelerometer. The accumulated dimensional errors of the actual parts have been calculated, and used to validate the STEP baseline housing design. Requirements on housing alignment (for CMRR of 10−4) and concentricity have been met. We have also completed the manufacture of “brass-board” inner accelerometers, currently under cryogenic test. We will discuss recent test results, and present our plans for further testing.