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The 422E series in-line charge converters are designed to convert the high impedance of a charge
mode piezoelectric transducer to a low-impedance voltage by means of an ICP ® signal conditioner.
These units may be used with either quartz or ceramic charge-mode piezoelectric sensors.
description
The 422E series in-line charge amplifiers operate from an ICP ® signal conditioner. The unit employs a
high gain amplifier to perform the impedance transformation. The charge output of the transducers
may be scaled in terms of acceleration, pressure or force. The output is then mV/g, mV/psi or mV/lb,
respectively.
installation
Connect the 422E series to the transducer with low-noise cable (003A) only. Standard coaxial or two-
wire cable may be used between the amplifier and the signal conditioner, and between the signal
conditioner and the readout device.
Note: For optimum noise performance, the cable length between the sensor and the 422E should be
minimized.
operation
To operate, simply connect the input of the 422E to the transducer using low-noise (003A) cable and
the output to any ICP ® signal conditioner using standard cable. The output of the signal conditioner
may then be connected to an oscilloscope or other monitoring device. This output will be an AC signal
(see
specification
for actual frequency response) with a DC bias. Many PCB signal conditioners
remove the bias via an AC coupling circuit.
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