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Accelerometer provides thermal stability, global accuracy

Posted: 12 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:accelerometer? thermal stability? global accuracy?

Endevco Corp. has introduced model 7290D, a variable capacitance accelerometer with onboard, microprocessor-based temperature compensation.

Model 7290D is designed to provide very high thermal stability and global accuracy required for measurement of relatively low-level accelerations in laboratory test and measurement, automotive and aerospace applications including both military and commercial flight testing.

Patented by Endevco, typical applications for model 7290D require measurement of whole body motion immediately after the accelerometer is subjected to a shock motion and in the presence of severe vibration inputs. Gas damping and internal over-range stops enable its anisotropically etched, silicon sensing element to withstand high shock and acceleration loads. The use of gas damping in the sensing element also results in very small thermally induced changes in frequency response.

With its onboard, microprocessor-based temperature compensation, the model 7290D delivers 2.5 percent total dynamic accuracy over the entire military spec temperature range of -55C to 125C.

Custom signal conditioning enables the model 7290D to operate with a nominal excitation of 8Vdc to 30Vdc and provides a high-level, low-impedance output. The 2.25V differential output (single-ended output optional) is DC coupled at a DC bias of approximately 2.5V.

- Ismini Scouras

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