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Summary of Contents for Electro-Voice 903E
- Page 1 903E 903E‑2 Customer Maintenance Manual...
- Page 3 Introduction | en Introduction Description The Electro-Voice model 903E noise-canceling condenser handheld microphone is designed for use in high noise environments where high speech intelligibility is desired such as in aircraft cockpits, passenger cabins, control towers, or terminal areas. The electret element virtually eliminates EMI, RFI, and magnetic signals channeling the full power of your communications system into crisp, articulate voice transmission with the RTCA frequency response.
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Page 4: Operation
| Operation 903E Operation Notice! Inspect the hand mic for signs of damage. Do not use the hand mic if signs of damage evident. Plug the hand mic into the aircraft console. Hold the microphone so that the front side (EV logo showing) is facing your mouth and placed near your lips. -
Page 5: Overhaul Instructions
Reassembly Reassembly is the reverse of disassembly. Check Microphone Output The 903E electret microphone has a speech output of approximately 0.2 volts and is optimal when used with the DO-214A test circuit or an aircraft intercom. Check Switch Operation With the switch released: Configure a multi-meter to read resistance. - Page 6 | Overhaul Instructions 903E Performance to Specifications NOTE: Electrical conformance to DO-214A requires special equipment and an artificial voice. Diagrams Figure 3.1: 903E Dimensions Switch White Head Amplifier Black Assy Shield Shield Black PJ Plug Sleeve Ring PJ Schematic F01U396090 Switch Amplifier...
- Page 7 WSHR, LOCK, #3, INT TOOTH, (C OF C REQ) F01U147159 GASKET, NEOPRENE F01U145820 SPRING, SPCL, STL, ZI F01U415606 ASSY 903E MIC, MIC HEAD F01U152871 SPACER, .94OD, FOAM F01U415127 ASSY 903E MIC, CASE, BACK F01U415602 SCR, 2-56 X 1/4, FLT HD, XREC...
- Page 8 | Overhaul Instructions 903E F01U126476 CABLE ASSEMBLY, A4M, XLR F01U415131 CMP 903E Handmic Nameplate 903-2341 F01U415132 CMP 903E Handmic Nameplate 903-2342 F01U327244 TUBING, 3/32ID, THERMOFIT, 3/8,BLK F01U415129 RIVET solid PA Black OD .2 WALL .04 .13 F01U415130 PCBA 903E AMP...
- Page 9 903E Environment Qualifications Form | en Environment Qualifications Form Microphone, Electret (Handheld 903E) TSO Number: TSO-C139a Conditions DO-160G Description of Conducted Tests Paragraph # Low Temperature 4.5.1, 4.5.2 Equipment tested to Category A1 High Temperature 4.5.3, 4.5.4 Equipment tested to Category A1 Altitude 4.6.1...
- Page 10 | Environment Qualifications Form 903E Conditions DO-160G Description of Conducted Tests Paragraph # Electrostatic Discharge 25.0 Equipment tested to Category A Other Test Fire Resistance tests were conducted in accordance with Federal Aviation Regulation, Part 25. Appendix F, F.A.R. 25.853 and F.A.R.
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Page 11: Technical Specifications
903E Technical Specifications | en Technical Specifications (per RTCA/DO-214A and DO-160G) Generating element Electret condenser Frequency response 300-5000 Hz (See Figure 5.1) Impedance Matches standard aircraft input circuit Sensitivity -28 ±3 dBV/Pascal at 1 kHz Total Harmonic Distortion (THD) <5% at 114 dBSPL in 350 Hz and 6 kHz; and... - Page 12 | Technical Specifications 903E Typical Normalized Frequency Response 1000 10000 Frequency (Hz) Figure 5.1: 903E Frequency Response 2024-09 | 05 | F.01U.411.957 Bosch Security Systems, LLC Customer Maintenance Manual...
- Page 13 903E Technical Specifications | Bosch Security Systems, LLC 2024-09 | 05 | F.01U.411.957 Customer Maintenance Manual...
- Page 14 | Technical Specifications 903E 2024-09 | 05 | F.01U.411.957 Bosch Security Systems, LLC Customer Maintenance Manual...
- Page 16 Bosch Security Systems, LLC 130 Perinton Parkway Fairport, NY 14450 www.telex.com © Bosch Security Systems, LLC, 2024 EU importer: Bosch Sicherheitssysteme GmbH Robert-Bosch-Platz 1 70839 Gerlingen Germany © Bosch Sicherheitssysteme GmbH, 2024 202409271731...
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