G.R.A.S. Type 40HL Instruction Manual Download Page 7

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LI0107 - Revision 7 September 2012

Fig 3.1

Setup for measurements: Type 40HL mounted on Tripod AL0006 viaTripod Adapter RA0093

Operating Type 40HL

1. Mount Type 40HL onto a stand (e.g. Tripod AL0006 with Tripod Adapter RA0093)

G.R.A.S.

Power Module

Type 12AK

Gain

+20

+10

+30

+40

+50

Dir

Lin

Filter

Overload

Inst.

Latch

SysCh.

Adjust

Power

Ovl.

Reset

Low

Batt.

Signature Series

Output

Input

Type 40HL

Power module

Analyzer

Summary of Contents for Type 40HL

Page 1: ...www gras dk LI0107 Revision 7 September 2012 Instruction Manual Low noise Microphone System Type 40HL ...

Page 2: ...evision 7 September 2012 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 ...

Page 3: ...to most standard power modules with LEMO 1B connector optional accessories from G R A S refer to the section What to Order The power modules supply voltages for powering preamplifiers and polarizing microphones Preamplifier The preamplifier is a true low noise amplifier with LEMO 1B connector and has a built in compensation filter for free field microphones Microphone The microphone is a low noise...

Page 4: ...ighted cases Fig 1 2 Typical frequency response curves of Type 40HL either Pistonphone Type 40AP recommended due to its built in precision barometer or Pistonphone Type 40AA and Calibration Adapter RA0090 for attenuating the pistonphone signal to 94dB re 20 µPa See also the section What to Order 100kHz 10kHz 1kHz 100Hz Decibels re level at 250 Hz 6 4 2 0 2 4 6 8 10 180º Random incidence 150º 120º ...

Page 5: ...er module and analyzer on 3 Adjust the analyzer to indicate 94dB re 20μPa for an RMS input of S volts where S is the system sensitivity of the Type 40HL as quoted on the calibration chart Pistonphone Calibration Use either Pistonphone Type 42AP with built in precision barometer recommended or Pistonphone Type 42AA fitted with a Coupler RA0090 all items available from G R A S to produce 94dB re 20μ...

Page 6: ...Mount the microphone of the Type 40HL in the Coupler as shown in Fig 2 2 and switch the Pistonphone on 7 Adjust the analyzer to indicate 94dB re 20μPa 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 Plus any corrections for barometric pressure See pistonphone manual ...

Page 7: ...od Adapter RA0093 Operating Type 40HL 1 Mount Type 40HL onto a stand e g Tripod AL0006 with Tripod Adapter RA0093 G R A S Power Module Type 12AK Gain 20 10 30 40 50 0 HP Dir Lin AW Filter Overload Inst Latch SysCh Adjust Power On Ovl Reset Low Batt Signature Series Output Input Type 40HL Power module Analyzer ...

Page 8: ...dule 1 ch Type 12AK Power Module 2 ch Type 12AQ Windscreens set of 5 AM0069 Pistonphone built in precision barometer 250Hz or 251 2 Hz 114dB 0 05dB Type 42AP recommended Pistonphone 250Hz 114dB 0 08dB Type 42AA Pistonphone Coupler 94dB re 20 µPa RA0090 required for both pistonphones Tripod AL0006 Tripod Adapter required RA0093 3 m Extension cable AA0008 10 m Extension cable AA0009 30 m Extension c...

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