7270A

Features

•2000 to 200 000 g full scale
•High resonance frequency
•DC response for long duration transients
•Minimal zero shift after shock
•Pyrotechnic and penetration

Description

The Endevco model 7270A series of piezoresistive accelerometers are rugged undamped units designed for shock measurements.

Endevco micromachines the sensing system of the 7270A from a single piece of silicon. This etched silicon chip includes the inertial mass and strain gages arranged in an active four-arm Wheatstone bridge circuit complete with a novel on-chip zero balance network.

The low mass, extremely small size and unique construction of the element blends an exceptionally high resonance frequency with characteristics such as low impedance, high overrange, and zero damping for no phase shift. The high resonance frequency of these sensors permits their survival in the presence of these high frequency components in a shock pulse that could shatter the seismic system of accelerometers having lower resonance.

High resonance frequencies and zero damping also allow the accelerometer to respond accurately to fast rise time, short duration shock motion. With a frequency response extending down to dc or steady state accelerations, these transducers are ideal for measurements of long duration transients.

Model 7270A-XXM4, with integral 1/4-28 mounting stud and 7270A-XXM6 with mechanical isolator, available on special order.

Download PDF File