Endevco® Model 7240C Miniature Piezoelectric Accelerometer 0 pages

Model 7240C
Piezoelectric accelerometer
Features

Description

• Light weight (4.8 gm)
• Hermetically sealed
• High frequency measurement
• High temperature operation (+260°C)
• Wide bandwidth (flat to 30 kHz)

The Endevco® model 7240C is a miniature, light-weight
piezoelectric accelerometer designed specifically for high
frequency vibration measurement. Its unique sensor
design allows high seismic resonance and ruggedness
in the same package. The unit is hermetically sealed
against environmental contamination and its light
weight (4.8 gm) effectively eliminates mass loading. The
accelerometer is a self-generating device that requires
no external power source for operation.
The model 7240C features Endevco’s Piezite® type P-8
crystal element, operating in annular-shear mode.
This device exhibits low base-strain sensitivity, wide
bandwidth, and excellent output stability over time.
Signal ground is connected to the outer case of the unit.
When used with one of the supplied isolated mounting
studs, the accelerometer is electrically isolated from
ground. A specially designed low-noise coaxial cable is
supplied for error-free operation.
Endevco signal conditioner models 133, 2775B, 2771C, 6634C or Oasis 2000 (4990A-X with
cards 428 and/or 433) computer-controlled system are recommended for use with this
high-impedance accelerometer.

TYPICAL AMPLITUDE RESPONSE, MODEL 7240C

20
15
10

dB DEVIATION

WITH ISOLATOR

5
0

GROUNDED

-5
-10
-15

1

10

100

1000

10000

-20
100000

FREQUENCY IN HERTZ
TYPICAL TEMPERATURE RESPONSE, MODEL 7240C

60
50

TYPICAL CAPACITANCE

% DEVIATIO N

40
30
20
10
0

CHARGE SENSITIVITY

-10
-20

-100

0

100

200

TEMPERATURE oF

300

400

500