OPERATION MANUAL FOR
MICROPHONE1
Series 103A
1.0DESCRIPTION
The Series 103A microphones are
The Model 103A (see installation drawing) has pigtail leads extending radially from the side of the unit and has a nominal sensitivity of 1500 mV/psi.
The Model 103A11 is similar in appearance and in mode of electrical connection, but differs from the Model 103A in that the sensitivity is nominally 500 mV/psi.
Models 103A02 and 103A12: ICP® Sound
Pressure Sensors
Models 103A and 103A11: ICP® Sound Pressure Sensors
The Model 103A02 is similar physically to the 103A and has similar sensitivity (1500 mV/psi), but the electrical connection is made through a top mounted
The Model 103A12 also has the top connector like the 103A02 but the sensitivity is 500 mV/psi.
These units are ideal for wind tunnel testing of models because of the small size and high sensitivity.
2.0DESCRIPTION
(Refer to installation drawing no.
The 103A Series Sensors utilize a bimorph bender crystal cantilevered from the side wall and attached to the center of a thin recessed invar diaphragm. Pressure acting on the surface of the diaphragm results in a net force which strains (or deflects) the diaphragm in proportion to the applied pressure. The diaphragm bends the crystal creating an output voltage which is also proportional to applied pressure.
This voltage is fed to the gate of a miniature MOSFET source follower amplifier which reduces the output impedance to less than 100 Ohms allowing the driving of long cables and permitting operating directly into most readout instruments.
Refer to Bulletin
Models 103A, A02, A11, and A12 have output signals superimposed upon a +4 V (approx.) bias level at the amplifier output. All PCB signal conditioners are designed to eliminate this bias voltage while supplying power to the internal amplifier.
Drawing Number: 21082
Revision: NR