Endevco Model 71M Series Piezoresistive Shock Accelerometers0 pages

Model 71M series
Piezoresistive accelerometer
Features

Description

• 2000 to 60 000 g full range
• High resonant frequency
• DC response
• 200 mV full scale output
• Negligible zero shift after shock
• 0.06 gram weight

The Endevco® model 71M series of subminiature SMT
piezoresistive accelerometers are rugged undamped
accelerometers designed for shock measurements.
Endevco micro-machines the sensing system of the 71M
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
resonant frequency with characteristics such as low
output impedance, 3x overrange, and zero damping for no
phase shift. The high resonant frequency of these sensors
permits their survival in the presence of the high frequency
components in a shock pulse that could shatter the seismic
system of accelerometers having lower resonance.

PAD 1 + EXC

PAD 3 + SIG

PAD 2 - EXC
PAD 4 - SIG

High resonant frequencies and zero damping also allow
the accelerometers to respond accurately to fast rise time,
short duration shock motion. With a frequency response
extending down to dc (steady state accelerations) these
transducers are ideal for measurement of long duration
transients, and permit integration of the accleration data to
obtain velocity and displacement.
U.S. Patents 4,498, 229, 4,605,919 and 4,689,600 apply to this unit.

Model number definition
71 MX - XXX

SCHEMATIC

Range (2K, 6K, 20K, 60K)
Modifier
Basic model number

Electrical connections

5 Vdc
10 Vdc
excitation excitation

Pre-tinned for hand solder reflow

71M5

71M10

Un-tinned for conductive epoxy or
wire bonding or resistance welding

71M1

71M4

Accessories
Product

Description

136

DC amplifier, 3 channel benchtop

Optional

436

DC amplifier, 3 channel rack mount

Optional

This product is subject to International Traffic in Arms Regulations (ITAR), and as such a license is
required for shipments outside the U.S. and other restrictions may apply.
Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco
maintains a program of constant surveillance over all products to ensure a high level of reliability. This program includes attention
to reliability factors during product design, the support of stringent Quality Control requirements, and compulsory corrective action
procedures. These measures, together with conservative specifications have made the name Endevco synonymous with reliability.
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(800) 982-6732 • (949) 493-8181 fax (949) 661-7231 • www.endevco.com • Email: applications@endevco.comt
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