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Фрагмент инструкции
3425 Walden Ave. Depew, NY 14043 USA Toll-free: (800) 828-8840 24-hour SensorLineSM: (716) 684-0001 Website: E-mail: info@pcb.com Drawing Number: 21082 Revision: NR OPERATION MANUAL FOR MICROPHONE Series 103A 1 1.0 DESCRIPTION The Series 103A microphones are high-sensitivity pressure sensors featuring miniature size, built-in solid state electronics and acceleration compensation. 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 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 10-32 coaxial connector. 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. Models 103A02 and 103A12: ICP® Sound Pressure Sensors 2.0 DESCRIPTION (Refer to installation drawing no. 103-1010-90 included as part of this manual.) 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 G-0001B, “General Guide to ICP® Instrumentation” for a detailed description of the built-in amplifier concept. 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 OPERATION MANUAL FOR MICROPHONE Series 103A 2 The result is a two-wire system, precluding the need for multi-conductor cabling. A second diaphragm, located behind the pressure diaphragm and attached to another bimorph bender crystal acting in opposition to the pressure crystal, provides acceleration compensation to the Series 103A Sensors. 3.0 INSTALLATION As shown in installation drawing 103-1010-90, the Series 103A Microphones may be properly mounted in several ways, the exact method chosen being a function of the space available along with other use dictated parameters. The simplest method of mounting, and also the one that utilizes the least volume, is the adhesive method. The microphone is simply bonded directly to the mounting surface with an (at least) .10” diameter hole through the surface to feed the pressure signal to the diaphragm. Many different types of adhesives may be used to bond the 103A in this manner. The important point being to apply the adhesive very sparingly so that removal does not damage the sensor. The 103A may also be mounted using the Model 061A04 Servo clamps if space is available. The Model 060A11 Clamp Nut may only be used with the top connector Models 103A02 and 103A12 since the radial wire leads of the Model 103A and 103A11 would interfere with the clamp nut. The installation drawing gives detailed instructions on preparation of the port for this type of installation. 3.1 ELECTRICAL For the Models 103A and 103A11 (pigtail models), connect the center conductor from the “Xducer” output of any ICP® power unit to the white (Pwr/Sig) lead and connect the outer shell of the “Xducer” connector to the black (ground) lead. The black lead is electrically connected to the outer case. (See figure below.) Models 103A & All: Electrical Connection NOTE: No electrical connection is made to the blue (vent) lead. This lead serves to vent internal pressure within the sensor when the 103A and 103A11 are used in evacuated chambers. The internal pressure bleeds out slowly around the wires of this lead. This lead may be cut off flush with body if the sensor will never be used in this manner. To make the electrical connection to the Models 103A02 and 103A12 (top connector models), simply connect the “Xducer” output of the power unit to the 10-32 coaxial connector using a PCB Model 002C Series coaxial cable. The output signal is taken from the power unit connector labeled “Scope” or “Output”. (See figure below.) 1 2 3 4 MODEL 103A02 & A12 002A CABLE XDUCER MODEL 482A04 POWER UNIT SCOPE TO READOUT Models 103A02 & A12: Electrical Connection WHITE BLUE (N.C.) XDUCER BLACK VIEW FROM DIAPHRAGM END SCOPE T...