PCB Test & Measurement Seite 163

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For Additional Specification Information Visit www pcb com PCB PIEZOTRONICS INC 716 684 0001 Fax 716 685 3886 161 Technical Information Force Figure 41 Positive Polarity Zero based AC Output Repetitive Pulse Applications In many force monitoring applications it is desired to monitor a series of zero to peak repetitive pulses that may occur within a short time interval of one another This output signal is often referred to as a pulse train As has been previously discussed the AC coupled output signal from piezoelectric sensors will decay towards an equilibrium state making it look like the positive force is decreasing In this scenario it would be difficult to accurately monitor a continuous zero to peak output signal such as those associated with stamping or pill press applications With the use of special ICP sensor signal conditioning equipment it becomes possible to position an output signal positive going above a ground based zero Operating in drift free AC mode PCB s Model 484B02 or a Model 410B01 ICP sensor signal conditioner provides the constant current voltage excitation to ICP force sensors and has a zero based clamping circuit that electronically resets each pulse to zero As outlined in Figure 41 this special circuitry prevents the output from drifting negatively and provides a continuous positive polarity signal ICP 3 Component Force Measurement System Charge Output Force Measurement System Figure 42 System Utilizing a ICP Sensor Signal Conditioner Figure 43 Low cost System Utilizing 3 Channel Industrial Charge Amplifier Model 010G10 Sensor Cable Model 442C04 or 482C05 or 482C16 Signal Conditioner Pigtails Model 003C10 Cabel 3 channel surface mount enclosure Three selectable input ranges of 1k 10k 100k pC Long discharge time constant for long duration measurements with an electronic reset option Supplied with attached Model 037AD010AD 10 ft 3 m 10 conductor cable terminating in pigtails Ideal for continuously monitoring industrial crimping and stamping operations Model 012A03 Output Cables Series 260 ICP 3 Component Force Sensor Readout Device Model 421A13 Industrial Charge Amplifier Series 260 Charge Output 3 Component Force Sensor Readout Device 9 T Mcatalog 2011 Seite 125 166 SYN G500 21 04 11 18 04 Seite 167