4
Case Isolated Accelerometers
Case isolated accelerometers (see Figure 3-3) are isolated electrically from
any conductive surface on
which
they are mounted. Isolated accelerometers
from OMEGA are built in
a
variety of configurations
and
eliminate any
possibility of ground noise interference. OMEGA Models ACC
101, ACC 102,
and ACC
301
are case isolated accelerometers.
Figure 3-3.
Case Isolated Accelerometer
GENERAL CHARACTERISTICS
Axis of Sensitivity
Most accelerometers are built to be sensitive to motion in one major axis.
Normally, the accelerometer will transduce shock and vibration that is input
normal to the accelerometer's mounting base. It should be noted that the
accelerometer will have some sensitivity to motion in the other two
orthogonal axes. This transverse or cross axis sensitivity is minor and
usually amounts to less than 5% of the major axis sensitivity.
Triaxial Accelerometers
Triaxial units essentially have three single axis accelerometers integrated
into a single package. Triaxial units have three independent output
signals. In triaxial units the three sensors share the same ground
conductor requiring only a 4-wire connector. Note that most single axis
accelerometers are two wire systems and most triaxial accelerometers are
4-wire systems.
