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Summary of Contents for Cirrus MK427
- Page 1 MK:427 Environmental Noise Microphone 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 plc 2016 Page 1 of 23...
- Page 2 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.
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Page 3: Table Of Contents
Appendix 3 The influence of the background noise level on calibration and verification ..........20 Appendix 2 CE Declaration of Conformity ........................21 Equipment Description ..............................21 Warranty Information..............................22 Cirrus Research Offices ..............................23 Page 3 of 23... -
Page 4: Important Information
MK:427 Environmental Noise Microphone Important information Each MK:427 unit will have its own output levels and electrostatic actuator output levels. Please refer to the factory calibration setup information for details for your specific instrument. The MK:427 is supplied with the configuration preset to meet those ordered from the factory. Calpot R1 is referred to in the Reference Calibration section on page 14. -
Page 5: Overview
MK:427 Environmental Noise Microphone Overview Thank you for choosing the MK:427 outdoor 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 of the MK:427 has been field proven over many years in a range of differing environments worldwide. - Page 6 = 72.3 – 10 dB(A) = 62.3 Please check with our technical department if you need confirmation as to the settings of your equipment or if you need any other technical guidance. Tel: + 44 1733 667100 email: sales@cirrus-environmental.com Page 6 of 23...
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Page 7: Mk:427 Microphone Unit System Diagram
MK:427 Environmental Noise Microphone MK:427 Microphone Unit System Diagram Page 7 of 23... -
Page 8: Mounting Information
MK:427 Environmental Noise Microphone Mounting Information 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 used to mount the MK:427 onto a building or other fixed structure. -
Page 9: General Guidance
MK:427 Environmental Noise Microphone General Guidance Positioning your MK:427 Noise Sensor Every site and application is different but here are some basic guidelines for effective positioning of your Noise Sensor: It is usually worth conducting a noise survey, or referring to measurement data from a recent noise survey to understand the noise profiles for the area. -
Page 10: Operation
MK:427 Environmental Noise Microphone Operation External Connections External connection to the MK:427 is made via the supplied 10m cable with the following wiring connections: Power Supply Red & Orange: Nominally +12VDC Black & Green & Braid & Blue: Power Ground (0V) Notes: The nominal power supply voltage is +12VDC. - Page 11 MK:427 Environmental Noise Microphone 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 onto the internal PCB. Page 11 of 23...
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Page 12: Verification & Calibration Of The Mk:427
MK:427 Environmental Noise Microphone Verification & calibration of the MK:427 The standard MK:427 unit is fitted with an electrostatic actuation system that allows the output of the system to be verified by generating a known sound level. The system can also be calibrated by using a reference acoustic calibrator and this process is described on page 14. -
Page 13: Typical Time History Trace During Using The Electrostatic Actuation Process
MK:427 Environmental Noise Microphone Example Actuation output measured = 89.9 dB Actuation 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 The picture below shows the effect of the actuation process upon the output level produced by the MK:427. -
Page 14: Reference Calibration
MK:427 Environmental Noise Microphone 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. - Page 15 MK:427 Environmental Noise Microphone 3. Attach the microphone grill to the microphone capsule 4. Connect the acoustic calibrator and select the 94dB level. 5. Adjust the calibration level using Calpot R1 for the output current given in the table below. This provides a reference calibration level so that the current output is now proportional to the noise level.
- Page 16 MK:427 Environmental Noise Microphone Example For the range of 34 to 104dB dB = (10 x I ) – 10, where I is the current output in mA. The current output for a known dB level is therefore I = (dB +10) /10 6.
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Page 17: Specifications
MK:427 Environmental Noise Microphone Specifications 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 Extras Winter Windshield: WS:73 Wall mounting Kit: CM:427 Page 17 of 23... -
Page 18: Appendix 1 Internal Wiring Connections
MK:427 Environmental Noise Microphone Appendix 1 Internal wiring connections Please note that the position of the following potentiometers and switches in the diagram below are for indication 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... -
Page 19: Appendix 2 Dc Voltage Output Option
MK:427 Environmental Noise Microphone 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 across the resistor of 10mV/dB. Page 19 of 23... -
Page 20: Appendix 3 The Influence Of The Background Noise Level On Calibration And Verification
MK:427 Environmental Noise Microphone Appendix 3 The influence of the background noise level on calibration and verification High background noise levels can affect the calibration of any noise measurement system. It is recommended that both the routine verification and reference calibration are carried out in environments where the ambient noise level is more than 15dB below that of the calibration level. -
Page 21: Appendix 2 Ce Declaration Of Conformity
MK:427 Environmental Noise Microphone Appendix 2 CE Declaration of Conformity Cirrus Research plc Hunmanby UK CE Certificate of Conformity Manufacturer: Cirrus Research plc Acoustic House, Bridlington Road Hunmanby, North Yorkshire, YO14 0PH United Kingdom Telephone +44 1723 891655 Equipment Description... -
Page 22: Warranty Information
Cirrus. The initial period of the warranty is 2 (two) years or 104 weeks from the date of purchase as a new instrument from Cirrus Research plc or their formally approved distributors OR 130 weeks from the date the instrument passed its final manufacturing inspection at Cirrus Research plc - whichever is the shorter. -
Page 23: Cirrus Research Offices
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.
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