Cirrus MK:438 User manual

Brand: Cirrus

Model: MK:438

Category: Motorcycle Accessories

Type: User manual

This manual is also suitable for

MK:437

MK:437 & MK:438 Outdoor Microphone

MK:437 & MK:438 Outdoor

Microphone User Manual

This manual, the software to which it relates, the

program code and drawings are all:

MK:437 & MK:438 Outdoor Microphone

Page 2

The content of this manual, any illustrations, technical information and descriptions within this document

were correct at the time of going to print. Cirrus Research plc reserves the right to make any changes

necessary, without notice, in line with the policy of continuing product development and improvement.

No part of this publication may be duplicated, reprinted, stored in a data processing system or transmitted

by electronic, mechanical, photographic or other means, or recorded, translated, edited, abridged or

expanded without the prior written consent of Cirrus Research plc.

No liability is accepted for any inaccuracies or omissions in this manual, although due care has been taken

to ensure that is it complete and accurate as possible.

Accessories supplied by Cirrus Research plc have been designed for use with the instrumentation

manufactured by Cirrus Research plc. No responsibility is accepted for damage caused by the use of any

other parts or accessories.

In order to take account of a policy of continual development, Cirrus Research plc reserves the right to

change any of the information contained in this publication without prior notice.

Produced by Cirrus Research plc, Acoustic House, Bridlington Road, Hunmanby, North Yorkshire, YO14 0PH.

Reference Number 01/01/MK:437 & MK:438/01

Document Printing Date 5 December 2001

MK:437 & MK:438 Outdoor Microphone

Page 3

MK:437 & MK:438 Outdoor Microphone System Page 4

Overview Page 4

Messages & Symbols Page 4

MK:43x Variants Page 5

Outdoor Microphone Page 6

Preparing for use Page 7

Assembling the Instrument Page 7

Connecting Cables Page 8

MK:438 Outdoor Microphone System Connections Page 9

Connections Page 9

Power Supply Page 9

Output Voltage Page 10

Guarantee Page 11

Cirrus Research Offices Page 11

MK:437 & MK:438 Outdoor Microphone

Page 4

MK:437 & MK:438 Outdoor Microphone System

Overview

The MK:43x outdoor microphone system is designed to be used as part of a portable

semi-permanent acoustic measurement system. It is powered by the sound level meter

or data logger to which it is connected via the screened and waterproof cable.

The microphone system in its standard form is not equipped with a separate rainshield,

relying instead on a windshield to prevent rain reaching the microphone capsule

membrane.

Messages & Symbols

Messages are used in this manual to bring important information to your

attention. The different message types are indicated as shown below.

Pay attention! A caution informs you that improper use of the equipment or

failure to follow instructions may cause data loss or may damage the

equipment.

Please read.

A note is a hint or advice that helps you make best use of the

equipment and accessories.

Normally, the MK:43x is use in conjunction with one of the Cirrus Research plc outdoor

measurement kits which contain the required sound level meter and have a waterproof

gland on the side to connect to the microphone.

The capsule height can be set to be between 1,2 and 1,5 meters, the two

internationally agreed microphone heights for various outdoor measurements.

It should be noted that this will bring the birdspikes to a height at which they

could cause danger to the user. Care should be taken therefore when using

the birdspikes and persons should be protected from this danger.

MK:437 & MK:438 Outdoor Microphone

Page 5

MK:43x Variants

Two variants of the microphone system are available, with each meeting the type 1

requirements of IEC60651. The particular variant required is determined by the

instrument to which the microphone is to be connected. These options must be

specified when the microphone is ordered. The variants are designated by the

engraving of the preamplifier body, located at the top of the main body assembly.

Version For use with

MK:437 CR:703B Sound Level Meter

MK:438 CR:800A Sound Level Meter

The MK:43x Outdoor microphone system is usually supplied with an MK:224 ½” Type 1

pre-polarized electret capsule, or may be specified without a capsule, allowing the

microphone of an existing sound level meter to be used.

The MK:43x is supplied with a windshield to reduce wind noise and to protect the

capsule from adverse weather conditions. The top of the windshield carries the

bird-spikes which prevent birds from landing on top of the unit, thus causing extraneous

noise as well as soiling the windshield. The unit is also supplied with an integral tripod

allowing the unit to be used as supplied.

Be very careful when using the bird-spike as it is at eye height.

MK:437 & MK:438 Outdoor Microphone

Page 6

Outdoor Microphone

MK:437 & MK:438 Outdoor Microphone

Page 7

Preparing for use

Assembling the Instrument

Legs

1. Carefully remove the microphone unit from the transit case. The unit is secured

by two knurled bolts.

2. Remove the tripod leg carrier from the mast, and unscrew the legs from the

carrier.

3. Attach the tripod legs to the base unit. Ensure that the legs are inserted correctly

before tightening.

4. The legs of the tripod unit can be adjusted to accommodate uneven ground.

MK:437 & MK:438 Outdoor Microphone

Page 8

Microphone Capsule

The microphone capsule is usually attached to the system during transit. If this is not

the case, remove the outer windshield from the unit. Gently screw the capsule on to the

preamplifier and replace the windshield.

Connecting Cables

Ensure that all cables and connectors are secure before using the instrument.

This is particularly important when the instrument is to be used in an outdoor

environment. The connectors used on the MK:43x are weatherproof and

should be tight to ensure an effective seal.

The is supplied, as standard, with a 10m microphone cable which also carries the

electrostatic actuator signals where this option is fitted.

Connect the Microphone Cable to the main enclosure. Connect the other end to the

Microphone System.

JKG C

A BH

E DF

MK:437 & MK:438 Outdoor Microphone

Page 9

MK:438 Outdoor Microphone System Connections

The MK:438 Outdoor Microphone system can be used to provide an electrical signal to

other noise measurement or recording equipment other than that supplied by Cirrus

Research plc.

The information below specifies the connections and power supply required by the

MK:438. Please note that the MK:438 is supplied

without

a microphone capsule unless

specified. The output voltage provided by the MK:438 will be determined by the

sensitivity of the microphone capsule used. The Class+ ½” Prepolarised Capsules from

Cirrus Research plc are suitable for use with the MK:438.

Connections

The output socket on the MK:438 is an Amphenol 10 Way Bayonet Connector Type

62-GB-12E12-10P

. Connection to this socket should be made using a Cable Socket

Type

62GB-56T-12-10S

with a Cable Clamp Type

62GB-585-12-10S.

A 10m ZL:410 Cable is supplied as standard with the MK:438. This cable may be

unterminated and uses the colours specified below.

Signal Pin Colour Connect to

+V A Red +15V

Signal Out B Blue Signal Out

Signal Ground C Braid/Screen 0V

Control Line D Black +15V

-V E Grey -15V

+VH F Brown +15V

not used G Turquoise

Signal Ground H Pink 0V

Signal Ground J Yellow 0V

Signal Ground K Orange 0V

not used Green

not used Cyan

Power Supply

The MK:438 Outdoor Microphone requires the following power supply:

+15v

-15v

0v (Ground)

MK:437 & MK:438 Outdoor Microphone

Page 10

Current consumption is less than 100mA. Connection of the power supply must be

made as specified in the connections above.

Output Voltage

The output voltage provided by the MK:438 is determined by the sensitivity of the

microphone capsule specified. The nominal output voltages for the Cirrus Research plc

Class+ capsules are specified below:

Capsule Nominal Output Voltage

MK:224 Class 1+ 50mV/Pa

MK:226 Class 1 37mV/Pa

MK:216 Class 2+ 37mV/Pa

MK:215 Class 2 37mV/Pa

For example, a 94dB Acoustic Calibrator will generate a Sound Pressure of 1Pa, giving

the nominal output levels specified above.

Please note that microphone capsules differ in sensitivity between units of the same

type. Care should be taken to ensure that noise measurement systems are calibrated

before use to ensure accurate measurement.

The output impedance of the system is less than 1Ù and the output is current limited to

30mA.

MK:437 & MK:438 Outdoor Microphone

Page 11

Guarantee

Cirrus Research plc offers a 12 month guarantee on all of their units. This covers

all parts and labour excepting only damage caused by the user. Because of the

unique fragility of microphones, only internal short or open circuits are accepted

as faults and not accident damage. The guarantee requires the user to return the

unit to their nearest authorised Cirrus Research plc Agent. This guarantee is in

addition to any statutory rights in your country.

Cirrus Research Offices

The addresses given below are the Cirrus Research plc offices. Cirrus Research

plc also have approved distributors and agents is many countries worldwide. For

details of your local representative, please contact Cirrus Research plc at the

address below. Contact details for Cirrus Research authorised distributors and

agents are also available from the Internet Web site at the address shown below.

Main Office

Cirrus Research plc

Acoustic House

Bridlington Road

Hunmanby

North Yorkshire

United Kingdom

YO14 0PH

Telephone: 01723 891655

Fax: 01723 891742

e-mail: [email protected]

Technical Support [email protected]

Web Site: www.cirrusresearch.co.uk

Germany

Cirrus Research Buro Dresden

Schlueterstrasse 29

01277 Dresden

Germany

Telephone: (+49) 351 316 0950

Fax: (+49) 351 316 0949

e-mail: [email protected]

Website www.cirrusresearch.de

USA

Cirrus Research

1307-A South Euclid Street

Anaheim

CA 92802

USA

Telephone 714 535 8647

Fax 714 535 8649

Cirrus MK:438 User manual

Brand: Cirrus

Model: MK:438

Category: Motorcycle Accessories

Type: User manual

This manual is also suitable for

MK:437

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Cirrus MK:438 User manual

This manual is also suitable for

Cirrus MK:438 User manual

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