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Summary of Contents for GRAS 47HC
- Page 1 Instruction Manual GRAS 47HC 1/2” CCP Low-noise Microphone System...
- Page 2 First publication Copyright Notice © 2018 G.R.A.S. Sound & Vibration A/S Any feedback or questions about this document are welcome at gras@gras.dk. www.gras.dk Any technical documentation that is made available by G.R.A.S. is the copyrighted work of G.R.A.S. and is owned by G.R.A.S.
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Page 3: Table Of Contents
Verification with 42AG Multifunction Sound Calibrator ................5 Frequency Response Calibration ........................5 Ordering Information ...........................6 Specifications ..............................6 Warranty, Service and Repair........................8 Calibration ................................8 Warranty ................................... 8 Service and Repairs .............................. 8 Instruction Manual GRAS 47HC 1/2” CCP Low-noise Microphone System | 3... -
Page 4: Introduction
• a dedicated ½” low-noise preamplifier with built-in amplifier and compensation filter for free- field microphones 47HC connects to most standard CCP modules with BNC connector. It is crucial that the input module has a low noise floor. The microphone set has the same form factor as standard GRAS ½” microphone sets, and there- fore it can be used with standard mounting accessories. -
Page 5: Verification
Low-noise Microphone System. Verification with 42AG Multifunction Sound Calibrator To avoid overload of the highly sensitive 47HC it is crucial that the calibration signal does not exceed 94 dB re. 20 μPa. The GRAS 42AG Multifunction Sound Calibrator is ideal for daily verification of the 47HC because the 42AG can produce a calibration signal of 94 dB re. -
Page 6: Ordering Information
0 to 95 Humidity coefficient @250 Hz dB/% RH 0,001 Influence of axial vibration @1 m/s² dB re 20 μPa TEDS Connector type CE/RoHS compliant/WEEE registered Yes / Yes / Yes Instruction Manual GRAS 47HC 1/2” CCP Low-noise Microphone System | 6... -
Page 7: Warranty, Service And Repair
Manufactured to conform with: CE marking directive: 93/68/EEC WEEE directive: 2002/96/EC RoHS directive: 2002/95/EC GRAS Sound & Vibration reserves the right to change specifications and accessories without notice. Instruction Manual GRAS 47HC 1/2” CCP Low-noise Microphone System | 7...
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