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LI0152 – 4 July 2017

Frequency Response and Directional Response

-20

-15

-10

-5

1000

10000

Frekvens

41AC

Typical frequecy responce

90° incidence

0° incidence

0° incidence with correction

IEC expanded lim+

IEC expanded lim-

IEC lim +

IEC lim -

0° incidence

0° incidence with corr.

IEC 61672-1 tol

IEC 61672-1 tolerance -

90° incidence

Typical Frequency Response

Frequency [Hz]

Amplit

e (dB)

IEC 61672-1 accept. limit +

IEC 61672-1 accept. limit -

Fig. 9.

Typical frequency response.

0,5

1,5

2,5

3,5

4,5

1000

10000

Acceptance limits for deviations of directional response

41AC w. windscreen

0º incidencs Lim dev ±30º

0° incidence
90° incidence
Lim w. uncertanty ±30º
Lim dev ±30º

Frequency [Hz]

Amplit

e (dB)

±30° Directional Response Measurements

0° and 90° Incidence

0° incidence

90° incidence

IEC 61672-1 tolerance

IEC 61672-1 acccept. limit

Fig. 10.

±30˚ directional response at 0° and 90° incidence.

Содержание 41AC-3

Страница 1: ...Instruction Manual G R A S 41AC 3 CCP Outdoor Microphone with RemoteCheck for Community Airport Noise www gras dk LI0152 4 July 2017 ...

Страница 2: ...ttp www gras dk Any technical documentation that is made available by G R A S is the copyrighted work of G R A S and is owned by G R A S The content in this document is subject to change without notice G R A S Sound Vibration A S is not liable or responsible for any errors or inaccuracies that may appear in this document Trademarks Any product names mentioned in this document may be trademarks or ...

Страница 3: ...3 LI0152 4 July 2017 Contents Introduction 4 Delivered Items 4 Installation 6 System Integration 12 Accessories 14 Specifications 14 Calibration Warranty and Service 18 ...

Страница 4: ...mperatures for a very long period i e a year or longer It uses a G R A S 40AE S2 1 2 Prepolarized Free field Microphone High Sensitivity and a G R A S 26CA 1 2 CCP Standard Preamplifier with BNC Connector It has TEDS according to IEEE1451 4 template UDID 127 0 0 0U Important The 40AE S2 microphone and its protective grid have been modified for the 41AC 3 Therefore microphone and grid cannot be rep...

Страница 5: ...mbled except for the windscreen and thread adapter 2 piece 1 pole mount adapter RA0286 Lower housing Windscreen AM0378 Top cone Preamplfier 26CA Upper housing microphone 40AE S2 Tripod and thread adapter SK0017 O ring OR2038 Fig 1 The parts of 42AC 3 ...

Страница 6: ...ng on a 1 pole See Fig 2 and Fig 3 3 The 41AC 3 s housing is attached to the mounting fittings with a M18 x 1 5 thread Two piece pipe adapter with 1 pipe thread ISO 228 1 G1 M18 x 1 5 GR1096 Tripod thread adapter with SK0017 1 4 threaded bushing Tripod thread adapter with 3 8 thread without 1 4 bushing Fig 2 The 41AC 3 lower housing s thread and adaptor for tripod or pole mount ...

Страница 7: ...ut the preamplifier 1 Unscrew the top cone from the housing 2 Set it aside and ensure that it is protected from dirt and moisture 3 Remove the microphone from the preamplifier and set it aside Ensure that it is protected from dirt and moisture 4 Push at the top of the preamplifier to make it slide down through the tube 1 3 2 4 Fig 3 Removing the top cone and releasing the preamplifier ...

Страница 8: ...o the preamplifier 2 Push the preamplifier up through the lower and upper housing 3 To expose the thread for the microphone ensure that the preamplifier is pushed up as far as it will go 4 Mount the microphone onto the preamplifier and tighten lightly 1 3 2 4 Fig 4 Connecting the cable and securing the microphone set ...

Страница 9: ...ing the Top Cone When the microphone has been mounted on the preamplifier you can mount the top cone 1 Screw on the top cone 2 Ensure that the top cone is properly fastened 1 2 6 Fig 5 Mounting the upper housing and the top cone ...

Страница 10: ...ical shape When the windscreen is pushed as far down as it will go it will be kept in place by a locking groove Because of this it cannot be dislocated unintentionally and incorrect measurements due to an incorrectly positioned windscreen are avoided 1 Slide the tube down over the top cone 2 Ensure that the tube is pushed as far down as it will go 1 2 End stop Locking groove Top of microphone diap...

Страница 11: ... be applied to slide the tube back up 1 Push at the end of the windscreen tube with a finger nail or a piece of hard plastic Caution Do NOT pull at the foam as this could cause it to deform or loosen it from the tube 2 Unscrew the top cone 3 Unscrew the microphone 4 Slide the preamplifier downwards and disconnect the cable 3 4 1 2 Push 3 4 1 3 2 4 1 2 Fig 7 Removing the wind screen and disconnecti...

Страница 12: ...ecifically for the 41AC 3 Only the 40AE S2 will ensure the stated measurement results and water protection Therefore neither microphone nor its protective grid can be replaced with standard items Verification and Calibration An acoustic in situ verification or a calibration in a laboratory with a pistonphone or a sound calibrator requires that windscreen and top cone are dismantled How to do this ...

Страница 13: ...hermal noise 17 dB A Dynamic range upper limit 138 dB Set sensitivity 250 Hz 2 dB 50 mV Pa Compliance IEC 61672 1 Polarization voltage 0 V Power supply 2 20 mA Temperature range operation 30 to 70 22 to 158 Connector type BNC TEDS IEEE1451 4 template UDID 127 0 0 0U CE RoHS compliant WEEE registered Yes Yes Yes Water Resistance IP55 295 mm 112 3 in 343 mm 131 2 in 12 mm 1 2 in 1 pipe thread ISO 22...

Страница 14: ... Frequency Response Frequency Hz Amplitude dB IEC 61672 1 accept limit IEC 61672 1 accept limit Fig 9 Typical frequency response 0 0 5 1 1 5 2 2 5 3 3 5 4 4 5 5 1000 10000 Acceptance limits for deviations of directional response 41AC w windscreen 0º incidencs Lim dev 30º 0 incidence 90 incidence Lim w uncertanty 30º Lim dev 30º Frequency Hz Amplitude dB 30 Directional Response Measurements 0 and 9...

Страница 15: ...ence IEC 61672 1 tolerance IEC 61672 1 acccep limit Fig 11 90 directional response at 0 and 90 incidence 0 2 4 6 8 10 12 14 16 18 20 1000 10000 Acceptance limits for deviations of directional response 41AC w windscreen 0º incidence Lim dev 150º 0 incidence 90 incidence Lim w uncertanty 150º Lim dev 150º Frequency Hz Amplitude dB 150 Directional Response Measurements 0 and 90 Incidence 0 incidence ...

Страница 16: ...egligent use an incorrect power supply or an incorrect connection to the equipment Service and Repairs All repairs are made at G R A S International Support Center located in Denmark Our Support Center is equipped with the newest test equipment and staffed with dedicated and highly skilled engineers Upon request we make cost estimates based on fixed repair categories If a product covered by warran...

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