Related Manuals for G.R.A.S. 41AO
Summary of Contents for G.R.A.S. 41AO
- Page 1 Instruction Manual Environmental Microphone Type 41AO G R A S SOUND & VIBRATION Skovlytoften 33, 2840 Holte, Denmark www.gras.dk gras@gras.dk...
- Page 2 Environmental Microphone Type 41AO Revision 29 04 2008 LI0023...
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Page 3: Table Of Contents
3.3.1 Type 41AO ........ -
Page 4: Introduction And Description
Fig. 1.1 Environmental Microphone Type 41AO Available Versions There are two versions of the Type 41AO, these are (see also Fig 1.2 and Table 2.1): Type 41AO With an externally-polarized Free-field Microphone Type 40AF and Preamplifier Type 26AK. - Page 5 Environmental Microphone Type 41AO / 41AO - S Reference Direction 0° incidence (airport noise IEC 61672) Type 41AO Type 41AO - S1 Fig. 1.2 Reference direction and available versions of the Type 41AO, see also Table 2.1 G.R.A.S. SOUND & VIBRATION...
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Page 6: Main Components
Environmental Microphone Type 41AO / 41AO - S Main Components The main components of the Type 41AO are (see also Fig. 2.1): The main body comprises essentially a stainless-steel tube (GR1094 for housing the Preamplifier) and a base (GR1096) that can be unscrewed (to enable inserting the Pream- plifier). - Page 7 (⅜-in UNC-16 plus SK0017 AA0008 adapter for ¼-in UNC-20) Fig. 2.1 Exploded view of user-serviceable components of the Type 41AO. The shaded numbers refer to the components of the Type 41AO - S1 G.R.A.S. SOUND & VIBRATION Page 6...
- Page 8 Environmental Microphone Type 41AO / 41AO - S Foam screen Foam split inner sleeve Fig. 2.2 Detachable polyurethane foam components (AM0009) of the windscreen G.R.A.S. SOUND & VIBRATION Page 7...
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Page 9: Operation
Type 41AO and the output cable are shown in Fig. 3.1. 3.3.2 Type 41AO - S The output cable (AA0035) of the Type 41AO - S should be connected to the BNC input of a CCP supply and signal input, for example the G.R.A.S. CCP Supply Type 12AL. Fig. 3.1 7-pin LEMO 1B male connector (external view) on the Type 41AO’s preamplifier and output... -
Page 10: Mounting The Desiccator Unit Al0014
The Desiccator Unit, which screws directly into the base of the main body of the Type 41AO, removes moisture from the air reaching the interior of the Type 41AO. - Page 11 Environmental Microphone Type 41AO / 41AO - S Desiccator Unit Packing Ring O-ring Washer GR0109 GR0110 Cable Wrench GR0112 Fig. 3.3 Details of mounting the Desiccator Unit Fig. 3.4 Pole-mount Adapter AM0029. Thread 50 mm (1.97 in) x G 1½ in (ISO 228/1) G.R.A.S.
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Page 12: Calibration
A calibration using either a Pistonphone or Calibrator requires first unscrewing the windscreen from the Type 41AO and mounting the pistonphone/calibrator directly onto the exposed micro- phone (Fig. 4.1) in the normal way and switching on. After calibration, replace the windscreen. -
Page 13: Maintenance
Environmental Microphone Type 41AO / 41AO - S Maintenance The windscreen should be cleaned as and when necessary depending on the severity of local conditions. Unscrew the windscreen, remove the foam inner sleeve and pull the top foam component up and out of its cage and wash it in clean water. -
Page 14: Specifications
IEC 61672 - 1 for reference direction (see Fig. 1.2) and 1000 Hz Dynamic Range: Upper limit: 146 dB (Type 41AO), 135 dB (Type 41AO - S), re. 20 µPa Lower limit: 14 dBA re. 20 µPa Output impedance: 50 Ω (typical) Output current: >2 mA (for 120 V supply voltage) - Page 15 Type 42AA (250 Hz, 114 dB re. 20 µPa) Pistonphone: Type 42AP (250/251.2 Hz, 114 dB re. 20 µPa) Sound Calibrator: Type 42AB (1000 Hz, 94 dB re. 20 µPa) Extension cables (Type 41AO) 7-pin LEMO to 7-pin LEMO 1B series 10 m: AA0009 30 m: AA0012...
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