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Related Manuals for G.R.A.S. Type 40HT
Summary of Contents for G.R.A.S. Type 40HT
- Page 1 Instruction Manual Single-channel Low-noise Measuring System consisting of: ½-inch Low-noise Level Microphone System Type 40HT and Power Module Type 12HF Type 40HT Type 12HF To Analyser G.R.A.S. Sound & Vibration Skovlytoften 33, 2840 Holte, Denmark Tel. +45 45 66 40 46...
- Page 2 Single-channel Low-noise Measuring System consisting of: ½-inch Low-noise Level Microphone System Type 40HT Power Module Type 12HF Revision 7 September 2012...
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Page 3: Table Of Contents
Specifications ..........12 ½-inch Low-noise Microphone System Type 40HT ..... . . 12 Single-channel Power module Type 12HF (separate order) . -
Page 4: Introduction And Description
Fig. 1.1 ½-inch Low-noise Measurement Microphone System Type 40HT * Tripods and Tripod adaptors are available from G.R.A.S. Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 4... -
Page 5: Microphone Type 40Ah
Type 12HF To Analyser Fig. 1.3 A Single-channel Low-noise Measuring System as described in this document, shown here with Tripod and Tripod Adapter (both available from G.R.A.S.) Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 5... -
Page 6: Preamplifier Type 26Hg
(which plugs in to the Gain and Filter Unit Type 26HT). A ¼” to ½” adapter, GR0010, is included, so that it can also be used with G.R.A.S. ½” micro- phones. See separate data sheet. Fig. 1.4 Typical frequency response curves of Type 40HT Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 6... - Page 7 180 º 90 º Random incidence 120 º 100 Hz 1 kHz 10 kHz 100 kHz Fig. 1.5 Free-field corrections for various angles of incidence on the ½-inch Microphone Type 40AH. Fig. 1.6 Typical noise floor of Type 40HT for system and microphone. Shown in ⅓-octave bands for both the linear and A-weighted cases Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 7...
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Page 8: Power Module Type 12Hf
Input 7-pin LEMO socket Output BNC socket Fig. 2.1 Front panel of the Power Module Type 12HF Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 8... -
Page 9: Rear Panel
Unscrew to remove base plate and gain access to the battery pack (see section 2.3). Fuse 315 mA fast blow Input for external Power Supply 6 V - 20 VDC Locking screw for base plate Fig. 2.3 Rear panel of the Power Module Type 12HF Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 9... -
Page 10: Battery Pack
Pull out the battery pack See Fig. 2.4. The battery pack consist of a battery holder and 4 x LR14 (C) standard alkaline cells. When replacing the batteries, replace all of them making sure that the polarity is as indicated on the battery holder. Fig. 2.4 Showing the battery pack of the Power Module Type 12HF Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 10... -
Page 11: Operation
Unscrew and remove the normal coupler of the Pistonphone. Screw the Coupler RA0090 to the Pistonphone, see Fig. 3.1. Push fit the ½-inch adapter GR0619 shown Fig. 3.1 to the entrance of the coupler RA0090. GR0619 Adapter for ½-inch microphone Fig. 3.1 Pistonphone without its normal coupler and ready to accept the Coupler RA0090 Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 11... -
Page 12: Measurements
G.R.A.S. Sound & Vibration Fig. 3.2 Pistonphone fitted with Coupler RA0090 and the microphone inserted into the Coupler Mount the microphone of the Type 40HT in the Coupler as shown in Fig. 3.2 and switch the Pistonphone on. Adjust the analyser to indicate 94 dB* re. 20 μPa. Measurements Assemble the system as shown in Fig. 1.3. -
Page 13: Specifications
Output impedance: 3 0 Ω Polarization voltage: 200 V Power supply: i nternal: 6 V from 4 x LR14 (C) standard alkaline cells e xternal: 6 V - 20 V DC via included Mains Adapter AB0010 Dimensions: h eight: 132.6 mm (5¼ in) w idth: 34.6 mm (1.3 in) d epth: 196.0 mm (7.7 in) Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 13... -
Page 14: Common
Type 12HF Power module (10 ch.): Type 12HM Windscreens (set of 5): AM0069 Pistonphone: Type 42AA Pistonphone Coupler: RA0090 (for 94 dB re. 20 µPa) Tripod: AL0006 Tripod Adapter: RA0096 3 m Ext. cable: AA0046 10 m Ext. cable: AA0047 30 m Ext. cable: AA0048 Manufactured to conform with: CE marking directive: 93/68/EEC WEEE directive: 2002/96/EC RoHS directive: 2002/95/EC Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 14...
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