Charge Preamplifiers ICP 100/110/120 Operators Manual
The Charge Preamplifiers ICP1×0 are used for piezoelectric transducers with charge output. These types of transducers are frequently given preference over ICP® compatible transducers because of their smaller dimensions and their higher dynamic range. Sometimes high temperature at the measuring point does not allow electronic circuits near to this place. The Charge Preamplifiers ICP1×0 have an ICP® compatible voltage output with low impedance. The output signal can be transmitted over long distances using inexpensive coaxial cables. The ICP1×0 is supplied by constant current via the output cable. Therefore, a special cable for power supply is not required.
Function
The abbreviation ICP® means “Integrated Circuit Piezoelectric”. It has been established be- tween many other brand names as
industrial standard for piezoelectric transducers. The integrated circuit of the Charge Preamplifier transforms the charge signal of the piezo ceramics, with its very high impedance and high sensitivity against interference, into a voltage signal with low impedance. This signal may be transmitted and processed much easier than the high impedance charge signal.
The distinguishing feature of the integrated circuits for impedance transformation is, that power supply and measuring signal are transmitted via the same cable. Figure 1 shows the circuit diagram. For easy separation of the low impedance output signal from the power supply, the amplifier circuit is supplied with constant current. This constant current has to be fed into the measuring line.
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