Maintenance And Repair; Output Signal - PCB Piezotronics ICP 103B11 Installation And Operating Manual

Acoustic pressure sensor

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Table of Contents

Refer to Guide G-0001B for tips on power and signal

utilization.

NOTE:

The internal low-noise amplifier in the

Model 103A, A02, A11 and A12 differ from the

standard ICP

amplifiers described in Guide G-

0001B in that the turn-on (or bias) voltage is

nominally +4 volts.

Proper turn-on for Models 103A02, A11 and Al 2

will not give center scale reading on the fault monitor

meters found on most PCB signal conditioners but

will show a reading of approximately 20% of F.S. on

these meters. This puts it at the lower limit of the

green (or normal) area of the meters. This is normal

and in no way indicates faulty operation.

4.0

OUTPUT SIGNAL

The output signal from the 103A Series is a voltage

proportional to input pressure.

positive-going for increasing input pressure.

The signal is of high enough level and low enough

output impedance to be fed directly into most

oscilloscopes, tape recorders, strip chart recorders, A

to D converters, etc.

Consult the factory for information regarding galvo

driving since special amplifiers are needed to drive

most high-current galvanometers.

Low-frequency response is limited by sensor

discharge TC (given in the specification sheet) and by

coupling time constants throughout the system. To

take full advantage of the TC of the sensor, make sure

that coupling TC's from power unit to readout are at

least an order of magnitude longer than the discharge

TC or use a direct-coupled signal conditioner such as

the Model 484B. Consult factory for details.

5.0

CALIBRATION

The 103A Series Sensors must be dynamically

calibrated using a known step function or pulse, or

with a microphone calibrator.

Drawing Number: 21082

Revision: NR

OPERATION MANUAL FOR

MICROPHONE

Series 103A

At PCB, the units are subjected to various calibrated

steps of pneumatic pressure to obtain a linearity curve

over the full range of the instruments.

6.0

The small size and sealed construction of the Series

103A precludes field maintenance and repair.

Should the time constant degrade or an abnormality

appear in the normal bias voltage, bake the unit out in

a +250° F oven for 1 to 2 hours, then re-test.

If this is not effective or if other problems should

occur, contact the factory for assistance in tracing the

problem or for instructions on returning the unit for

repair.

7.0

The polarity is

l.)

current-limiting

incorporated in all PCB signal conditioners, (20 mA

maximum) to do so will destroy the internal amplifier.

2.)

higher than 250° F.

3.)

to do so voids the warranty.

4.)

been mounted with epoxies or other strong adhesives.

Excessive squeezing or torquing may damage the

units and/or cause a calibration shift.

5.)

leads to surrounding structures to avoid lead or cable

damage.

6.)

clamps or the clamp nut since this could damage the

units.

7.)

maximum pressure), to do so may change the

calibration.

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