Low-noise seismic accelerometer

20 February 2008 Analogue, Mixed Signal, LSI

Endevco has produced a compact seismic accelerometer which it claims is the lowest-noise model in the industry. The new model 87 is designed specifically for measuring ultra low-level seismic events and low-frequency vibration on structures and objects.

It employs state-of-the-art hybrid electronics operating in constant current mode to achieve its high signal to noise ratio, and weighing in at 170 grams, it is 70% lighter than traditional IEPE seismic accelerometers. It is hermetically sealed against environmental contamination, available in 1 V/g or 10 V/g sensitivity, and provides near-DC ­frequency response flat to 0,05 Hz.

A simple two-wire system transmits low-impedance voltage output and required power. Signal ground is electronically isolated from the outer case and mounting surface to prevent ground loops. A specially designed cable assembly is available as an optional accessory. Additional features include full scale out-put voltage of 5 V, temperature range of -20°C to 100°C, overload protection to 400 g, low impedance output at <10 Ω, stainless steel case, and top mounted 2-pin connector. Dimensions are 30 mm diameter hexagonal configuration, 40 mm height excluding connector, and 56,5 mm height including connector.

For more information visit www.endevco.com

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