G.R.A.S. 41AC-3 Instruction Manual

Instruction Manual

G.R.A.S 41AC-3 CCP Outdoor Microphone with
RemoteCheck for Community & Airport Noise

www.gras.dk

LI0152– 4 July 2017

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LI0152 – 4 July 2017

Revision History

Any feedback or questions about this document are welcome at [e-mail].

Revision Date Description

1 26 August 2014 First edition
2 4 July 2017 42AG substituted for the obsolete 42AB

Copyright Notice

© 2014, 2017 G.R.A.S. Sound & Vibration A/S

http://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 registered trademarks of
their respective companies and are hereby acknowledged.

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LI0152 – 4 July 2017

Contents

Introduction .................................................................................. 4

Delivered Items ............................................................................. 4

Installation .................................................................................. 6

System Integration ...................................................................... 12

Accessories ................................................................................ 14

Specifications ............................................................................. 14

Calibration, Warranty and Service ................................................... 18

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LI0152 – 4 July 2017

Introduction

The G.R.A.S. 41AC-3 CCP Outdoor Microphone for Community & Airport Noise is a precision
microphone set (IEC 61672-1) for monitoring community noise and the noise of overhead
aircraft.

It can be used for monitoring of noise with 90 degrees of incidence, typically community noise.
With the proper correction data, it can be used for 0 degrees of incidence, typically noise from
overhead aircraft. A USB flash drive with correction data is part of the delivery.

It is waterproof, rated at IP-55, and can operate unattended over a wide range of weather condi­tions and temperatures 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 replaced by standard items.

Delivered Items

1/2" Prepolarized Free-Field Microphone, High Sensitivity 40AE-S2

1/2’’ CCP Standard Preamplifier with BNC Connector 26CA

O-ring for preamplifier OR2038

USB flash drive with correction data for 0° (resolution: 1/12 octave)

Wind Screen AM0378

Top cone

-

Upper housing -

Lower housing -

1” pole mount adapter RA0286

Tripod Adapter GR1096

Tripod thread adapter SK0017

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LI0152 – 4 July 2017

41AC-3 is delivered preassembled except for the windscreen and thread adapter.

2-piece
1” pole mount

adapter RA0286

Lower housing

Windscreen
AM0378

Top cone

Preamplfier 26CA

Upper housing

½" microphone
40AE-S2

Tripod and thread
adapter SK0017

O-ring OR2038

Fig. 1. The parts of 42AC-3.