Triaxial variable capacitance accelerometer Model 72980 pages

Aerospace

Energy

Test and measurement

Triaxial variable capacitance accelerometer

Model 7298

Key features

ACCELERATIONS IN THE FOS T VE DIRECTIONS OF THE

'.'ARKED COORDINATE SYSTEM '.Via G VE POSITIVE

OUTPUTS FOR EACH CORRESPONDING AXIS

• Hermetic package with water

resistant connector

• 2, 5, 10, 30, 50 and 100 g

full scale ranges

• Motion, low frequency, tilt

• 10K g shock survivability

• Full analog signal path

• Precision digital temperature

compensation

STANDARD ~:::LERV,. E

INCHES [MILLIMETERS'

XX = • 02 IX-±S

XXX = ! .010 [ XX = i .25]

PIN ASSIGNMENT

1 = *EXC-5 = VREF

2 = -EXC 6 = +Z OUT

3 = *X OUT 7 = +Y OUT

4 = -EXC

The Endevco® Model 7298 Triaxial Accelerometer family is designed to provide the high thermal stability and

global accuracy that is typically required for the measurement of relatively low-level accelerations in aerospace

and automobile environments. Typical applications require the measurement of whole body motion in three

mutually orthogonal directions immediately following shock motion or in the presence of severe vibrational inputs.

State of the art temperature compensation electroincs provide for precise compensation over a wide temperature

range, while maintaining a full analog signal path

Each axis of the triaxial accelerometer utilizes a patented variable capacitance MEMS sensing element

Gas damping and internal overrange stops enable the MEMS sensing element to withstand high shock and

acceleration loads. The triaxial sensor arrangement is housed in a truly hermetic bolt-mount package featuring

an integral Glenair® Mighty Mouse 800-013 series hermetic receptacle. When used with a mating plug (Glenair®

series 800-006 thru 800-009] the connector assembly is protected against water ingress, making the 7298 an ideal

choice for permanent installations in hose-down locations.

nternal signal conditioning allows the 7298 to operate from an excitation voltage from 6Vdc to 45Vdc while

providing a high level, low impedance output. For each axis, the single-ended output is DC coupled and varies

linearly from 0.5Vdc to 4.5Vdc over the input range. For operating in differential mode, a precision 2.5Vdc reference

voltage is available at the connector, providing a DC coupled ±2Vdc differential output. The signal conditioning

ncludes factory programmable temperature compensation in order to maintain stringent thermal characteristics

and high accuracy. Frequency response is controlled by the use of near-critically damped sensors. As opposed to

oil damping, the use of gas damping in the sensing elements results in very small thermally induced changes in

frequency response

U.S. Patents 4,574,327, 4,609,968 and 4,999,735

MEGGHT

smart engineering for

extreme environments