Cirrus MK427 Скачать руководство пользователя страница 14 | Manualshive

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Cirrus MK427 Скачать руководство пользователя страница 14

MK:427 Environmental Noise Microphone

Page 14 of 23

Reference Calibration

The output levels of the MK:427 can be adjusted using a Cirrus CR:515 or CR:514 Acoustic Calibrator
as a reference source with the electrostatic actuator providing for routine verification.

Please note that this procedure should not be carried out unless the overall calibration of the
system needs to be verified and is included in this manual for reference only.

To create a reference calibration follow the steps below:

1.

Remove the Windshield from the microphone unit.

2.

Carefully unscrew the electrostatic actuator unit from the microphone capsule

Care must be taken at this step as the diaphragm of the microphone capsule will be exposed and is
easily damaged.

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Содержание MK427

Страница 1: ...vironmental Noise Microphone Page 1 of 23 MK 427 Environmental Noise Microphone Revision 9 This manual the software to which it relates the program code and drawings are all Copyright Cirrus Research...

Страница 2: ...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 C...

Страница 3: ...427 12 Routine verification using the electrostatic actuator system 12 Explanatory Note The principle of electrostatic actuation 12 Typical time history trace during using the electrostatic actuation...

Страница 4: ...er during a Reference Calibration First Steps Once you have received shipment of your new MK 427 Noise Sensor unit we would recommend the following stages to setup and install the equipment Stage 1 Un...

Страница 5: ...door noise sensor This high quality outdoor environmental noise microphone system is ideal for integrating with other data logging and external measurement systems The mechanical and acoustic design o...

Страница 6: ...hich is the most commonly used frequency weighting for the measurement of environmental and industrial noise levels The 4 20mA current loop output is ideal for integration to many process measurement...

Страница 7: ...MK 427 Environmental Noise Microphone Page 7 of 23 MK 427 Microphone Unit System Diagram...

Страница 8: ...rmation The unit is supplied with a standard mounting kit to enable the unit to be fixed to a pole or similar 3 x Jubilee clips 2 x U Bolts with washers nuts The optional CM 427 mounting kit can be us...

Страница 9: ...noise profiles for the area Install the sensor at a location nearby to where the environmental noise is most likely to cause annoyance to neighbouring residential areas or other sites Legislation oft...

Страница 10: ...power supply within the range of 9VDC to 36VDC The maximum current for normal operation is 75mA The power supply for the unit must be independent of the isolated loop circuit Isolated Loop circuit Whi...

Страница 11: ...Noise Microphone Page 11 of 23 If the installation requires that the factory supplied 10m cable must be replaced then please refer to Appendix 1 Internal wiring connections for the connection details...

Страница 12: ...ime to settle properly before reading the value electrically When this voltage level is applied the actuator excites the microphone to a specific level which is shown on the Factory Configuration Info...

Страница 13: ...level on Factory Configuration Sheet 90 6 dB So difference between output and factory tested setting 0 7dB or 0 7 10 0 07mA Typical time history trace during using the electrostatic actuation process...

Страница 14: ...e note that this procedure should not be carried out unless the overall calibration of the system needs to be verified and is included in this manual for reference only To create a reference calibrati...

Страница 15: ...utput current given in the table below This provides a reference calibration level so that the current output is now proportional to the noise level The current will depend upon the range of the instr...

Страница 16: ...actuator is dependent upon the position of the actuator drive plate above the microphone grill and will vary slightly depending upon how tightly it has been screwed down Very small changes in position...

Страница 17: ...ifications Current Loop Output See the Factory Configuration Information sheet Minimum loop voltage 10V Maximum loop voltage 30V External Power See the Factory Configuration Information sheet Optional...

Страница 18: ...ion only and may be different on a specific MK 427 unit depending upon the configuration of the unit R59 R2 R35 R46 SW1 SW2 R1 Cable Connections Yellow Electrostatic actuator control line Green Power...

Страница 19: ...ophone Page 19 of 23 Appendix 2 DC Voltage output option To convert the 4 20mA output current to a DC voltage output connect LOOPOUT to the Loop Power Input Ground via a 100ohm resistor for a voltage...

Страница 20: ...han 70dB A As an example if the electrostatic actuation system is generating a level of 90dB and the ambient level is 85dB the resulting level will be 91 1dB It is also likely that the background nois...

Страница 21: ...ment Description The following equipment manufactured after 1st January 2009 MK 427 Environmental Noise Microphone Along with standard accessories According to EMC Directives 89 336 EEC and 93 98 EEC...

Страница 22: ...er there will be a reduced charge for their replacement during the annual Traceable Calibration 8 On completion of the annual Traceable Calibration by Cirrus Research plc or an official Cirrus Calibra...

Страница 23: ...s 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 Yo...

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