Shock Accelerometer
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002-096e-01.19
Figure 5:
Incorrect Cable Strain Relief
See Section 8.5 for information on cables available from Kistler.
7
Operation
Piezoelectric accelerometers are self generating transducers. While
the quartz piezoelectric sensor does not require an external power
source, it is necessary to provide power to the shock acceleometer’s
internal electronic impedance converter. This section is intended to
provide the user with the information necessary to ensure accurate
measurements with shock accelerometers. Topics to be covered
include powering, signal conditioning, frequency response and driving
long cables.
7.1
Powering
7.1.1
Using “Built In” Power Sources
Many FFT analyzers and vibration monitors are available with internal
accelerometer power supplies. Often identified as "Constant Current
Sources", these internal power supplies are generally compatible with
Kistler shock accelerometers.
Before using the built-in power source, compare the measurement
instrument current source specifications with the current and voltage
specifications of the shock accelerometer to be used. If the instrument
accelerometer power is within the range required by the specific shock
accelerometer there should be no problem with compatibility. If the
user plans to drive long cables (over 430 feet/130 m) the guidelines in
section 6.2 should be followed. The accelerometer low frequency
response may be affected by the input impedance of the measuring
instrument as discussed in Section 6.4.4.
