A charge amplifier is a special type of preamplifier used with non-ICP piezoelectric accelerometers. Its purpose is to convert the extremely high output impedance of the accelerometer to a low value suitable for transmitting the vibration signal over cables to other signal processing instruments. The charge amplifier is sensitive to the amount of electric charge generated by the accelerometer rather than the voltage the accelerometer generates. Because the charge is independent of the cable attached to the accelerometer, the sensitivity of the accelerometer does not vary with cable length as it does when using a voltage amplifier.
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