 The Endevco Model 7754 is a rugged piezoelectric accelerometer
with integral electronics, designed specifically for measuring
ultra-low level, low frequency vibration on structures
and objects. The unit is hermetically sealed against environmental
contamination, features 1 V/g sensitivity, state-of-the-art
signal-to-noise ratio, near-dc frequency response, and
much higher shock survivability than most servo accelerometers.
The Model 7754 incorporates an advanced low-noise hybrid
circuit operating in constant current mode. A simple two-wire
system transmits its low-impedance voltage output and
the required power. Signal ground is connected to the
outer case for complete electrostatic shielding. Electrical
isolation is maintained with an isolating adaptor. The
patented ISOSHEAR® design is immune to most non-vibratory
inputs. To further minimize acoustic and thermal transient
sensitivity, a specially designed environmental boot is
supplied.
A bench test was performed to explore the resolution of
the Model 7754. With its exceptional signal-to-noise ratio,
the transducer was able to pick up the micro-g structural
responses of the test fixture induced by local seismic
activities.
Endevco battery-powered Signal Conditioner Model 4416BM1
or Model 2793M1 Constant Current Supply are recommended
for use with the accelerometer.
Features:
• Micro-g resolution, 1 Volt per G
• Near-DC response, flat to 0.05 Hz
• Survive > 1000 g's, +/-5 G F.S.
• Low impedance output
• Hermetically sealed, < 120 gm
• Applications: Spacecraft response, seismic measurement,
optical and
photo lithography applications, transportation studies,
etc.
Endevco Model 7754-1000
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