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
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