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DDI-5BICP-Peak and
DI-5BICP-RMS Amplifiers
for ICP-style Piezoelectric Transducers |
Product Highlights
Models DI-5BICP-PEAK and DI-5BICP-RMS provide a cost-effective
method for interfacing common ICP® style transducers
to DATAQ Instruments' wide range of data acquisition products.
ICP® transducers, such a piezoelectric accelerometers
and microphones, feature built-in signal conditioning
and low impedance outputs, but do require an external
excitation power supply. This must be provided as a current-mode
source, since the transducer's output resistance changes
as a function of applied force or acceleration. Constant
current excitation transforms this variable resistance
to a variable voltage that is directly proportional to
the measured phenomena.
The constant current source of DI-5BICP amplifiers yields
5.3 mA DC excitation with a compliance voltage of 8-12
VDC. The amplifiers feature AC coupling to remove the
DC component of the transducer's signal so that only dynamic
waveform information is passed through the amplifier.
Gain for both amplifier models is fixed to 1, although
many of DATAQ Instruments data acquisition products feature
programmable gain per channel. This feature may be applied
to yield greater sensitivities when required.
Model DI-5BICP-PEAK is simply a unity gain amplifier with
a built-in constant current excitation source. This amplifier
should be used when the application demands a complete
reproduction of the force or acceleration waveform. Model
DI-5BICP-RMS expands on this basic design by providing
a true rms converter that is useful for lower speed trending
of the true rms value of the applied force or acceleration.
Note: Both modules come with galvanic isolation (or electrical
isolation) between power supply, sensor, and analog output.
ICP is a registered trademark of PCB Piezotronics, Inc. |
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