Related Manuals for G.R.A.S. Type 40HL
Summary of Contents for G.R.A.S. Type 40HL
- Page 1 Instruction Manual ½” Low-noise Microphone System Type 40HL www.gras.dk LI0107 - Revision 7 September 2012...
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Page 2: Table Of Contents
Contents Introduction ................3 Calibration ................5 Based on System Sensitivity ............... 5 Pistonphone Calibration ................5 Frequency Response Calibration ..............6 Operating Type 40HL ..............7 Specifications ................8 Accessories................8 Revision 7 September 2012... -
Page 3: Introduction
Frequency Response and Noise Floor A typical free-field response of Type 40HL for 0 ° is shown in Fig. 1.2. Fig. 1.3 shows free-field corrections for various angles of incidence on the ½" microphone. - Page 4 Fig 1.3 Free-field corrections for various angles of incidence on the ½" microphone Fig 1.4 Typical noise floor of Type 40HL for system and microphone. Shown in ⅓-octave bands for both the linear and A-weighted cases. LI0107 - Revision 7 September 2012...
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Page 5: Calibration
114 dB re. 20 μPa. Proceed as follows: Connect the Type 40HL via its LEMO plug to the LEMO input socket of the power module. Connect via a suitable cable the BNC output of the power module to the analyzer to be used, and switch both Power Module and analyzer on. -
Page 6: Frequency Response Calibration
Pistonphone fitted with Coupler RA0090 and the microphone inserted into the coupler. The spring arrange- ment supplied with the coupler is not used. Mount the microphone of the Type 40HL in the Coupler as shown in Fig. 2.2, and switch the Pistonphone on. -
Page 7: Operating Type 40Hl
Operating Type 40HL Mount Type 40HL onto a stand (e.g. Tripod AL0006 with Tripod Adapter RA0093) Type 40HL G.R.A.S. Power Module Type 12AK Power Batt. SysCh. Ovl. Adjust Reset Overload Inst. Latch Gain Filter Input Output Signature Series Power module Analyzer Fig 3.1... -
Page 8: Specifications
Manufactured to conform with: ______ CE marking directive: * These cables also function as connection cables 93/68/EEC (to connect directly from Type 40HL to a power module). WEEE directive: 2002/96/EC RoHS directive: 2002/95/EC G.R.A.S. Sound & Vibration continually strives to improve the quality of our products for our customers; therefore, the specifications and accessories are subject to change.