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G.R.A.S. 40HH Instruction Manual

Single-channel low-noise measuring; system consisting of: 1/2 inch low-noise level microphone; system type and power module;
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Instruction Manual
Single-channel Low-noise Measuring
System consisting of:
½-inch Low-noise Level Microphone
System Type 40HH and
Power Module Type 12HF
G.R.A.S.
Sound & Vibration
Skovlytoften 33, 2840 Holte, Denmark
40HH
12HF
Tel. +45 45 66 40 46
Fax +45 45 66 40 47

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  • Page 1 Instruction Manual Single-channel Low-noise Measuring System consisting of: ½-inch Low-noise Level Microphone System Type 40HH and Power Module Type 12HF 40HH 12HF G.R.A.S. Sound & Vibration Skovlytoften 33, 2840 Holte, Denmark Tel. +45 45 66 40 46 Fax +45 45 66 40 47...
  • Page 2 Single-channel Low-noise Measuring System consisting of: • ½″ Low-noise Level Microphone System Type 40HH • Power Module Type 12HF Revision 17 September 2017...

  • Page 3: Table Of Contents

    Specifications ..........12 ½″ Low-noise Microphone System Type 40HH......12 Single-channel Power module Type 12HF (separate order) .

  • Page 4: Introduction

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 4 Introduction Fig. 1.1 shows a ½″ Low-noise Level Microphone System Type 40HH which comprises: • ½″ Microphone Type 40AH. • ½″ Preamplifier Type 26HH with two built-in compensation filters and an overload-warning LED.
  • Page 5 Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 5 Fig. 1.2 Power modules available from G.R.A.S. for Type 40HH, Left: Single-channel Power Module Type 12HF Right: 10-Channel Module Type 12HM ½″ Low-noise Level Microphone System Type 40HH...
  • Page 6 Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 6 Fig. 1.4 Typical frequency response curves of Type 40HH 0 º 0 º 30 º 90 º 120 º 60 º 150 º 180 º 90 º...
  • Page 7 Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 7 Fig. 1.6 Typical noise floor of Type 40HH for system and microphone. Shown in ⅓-octave bands for both the linear and A-weighted cases G.R.A.S. SOUND & VIBRATION...

  • Page 8: Power Module Type 12Hf

    Power Supply is 0.8 V RMS, the microphone is being subjected to 94 dB re. 20 μPa. The actual sensitivity is quoted on the individual calibration chart supplied with each Type 40HH. Important! The Single-channel Power Module Type 12HF (available from G.R.A.S.) is a dedicated module.

  • Page 9: Rear Panel

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 9 Fig. 2.2 7-pin LEMO EGA 307 1B input socket (external view) • 7-pin LEMO EGA 307 1B input socket for the microphone and Preamplifier signal. Wiring diagram shown in Fig.

  • Page 10: Battery Pack

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 10 Battery Pack To gain access to the battery pack, unscrew the locking screw on the rear panel (Fig. 2.3) and slide the base plate off towards the rear. Pull out the battery pack See Fig. 2.4.

  • Page 11: Calibration

    4. Screw the Coupler RA0090 to the Pistonphone, see Fig. 3.1. 5. Push fit the ½″ adapter RA0181 shown Fig. 3.1 to the entrance of the coupler RA0090. 6. Mount the microphone of the Type 40HH in the Coupler as shown in Fig. 3.2 and switch the Pistonphone on.

  • Page 12: Frequency Response Calibratoin

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 12 Fig. 3.2 Pistonphone fitted with Coupler RA0090 and the microphone inserted into the Coupler 7. Adjust the analyser to indicate 94 dB* re. 20 μPa. Frequency Response Calibration The frequency response of the microphone has been factory-calibrated in a free field (anechoic chamber) by comparison with a reference microphone.

  • Page 13: Measurements

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 13 Measurements 1. Assemble the system as shown in Fig. 1.3. 2. Connect the output from the Power Module to an analyser. 3. Switch both Power Module and analyser on.

  • Page 14: Specifications

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 14 Specifications ½″ Low-noise Microphone System Type 40HH Low-noise Microphone System Type 40HH comprising: ½″ Microphone: Type 40AH Preamplifier: Type 26HH (with 3 m cable and LEMO FGA.1B.307 plug) Frequency response: 12.5 Hz - 10 kHz...

  • Page 15: What To Order

    Single-channel Low-noise Measuring System consisting of: Type 40HH and Type 12HF - Page 15 What to Order Type 40HH includes: Batteries: 4 x LR14 (C) standard alkaline cells Mains/line Adapter: AB0010 Optional Accessories Power module (1 ch.): Type 12HF Power module (10 ch.):...

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12hf

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