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Summary of Contents for Cirrus Research CR:306
- Page 1 CR:306 Sound Level Meter User Manual Page 1 User Manual for the CR:306 Sound Level Meter This manual, the software to which it relates, the program code and drawings are all: © Copyright Cirrus Research plc 1989-2013...
- 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.
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Page 3: Table Of Contents
Changing the Battery ....................15 Battery type....................... 15 Specification....................... 16 Technical Information ....................17 Free Field Correction ....................18 Microphone Correction Values ....................18 Example ..........................18 Warranty Information............Error! Bookmark not defined. Cirrus Research Offices ............Error! Bookmark not defined. -
Page 4: Overview
First time use. The CR:306 should be inspected for any signs of damage and also to ensure that all relevant accessories are present. Your CR:306 will have been supplied either as a single unit or as part of a full measurement kit, CK:306. -
Page 5: Instrument Controls
CR:306 Sound Level Meter User Manual Page 5 Instrument Controls... - Page 6 Page 6 CR:306 Sound Level Meter User Manual...
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Page 7: Taking Measurements
Allow the instrument to settle for 10 seconds after switching on before calibrating or taking measurements. Always check the battery before and after each measurement. The CR:306 monitors the battery continuously while operating. Ensure that the white MAX HOLD function is turned off when not required. If this is not done, the display will freeze the last reading and the word HOLD will be displayed on the top left of the LCD. -
Page 8: Display And Indicators
This action will prevent leakage damage. Display and Indicators Display The LCD display of the CR:306 is scaled in decibels, either 'A' or 'C' weighted, depending on the position of the A/C slide switch. There are indicators in the display as follows:- Function... -
Page 9: Fitting A New Battery
CR:306 Sound Level Meter User Manual Page 9 Fitting a New Battery 1. Ensure the instrument is turned off before removing the battery cover. 2. Remove the battery cover. 3. The battery is made accessible by pressing the left hand side of the battery cover down slightly and then sliding it to the right. -
Page 10: Field Calibration
Note: Although the CR:514 Acoustic Calibrator has an output of 94dB, the pressure correction of the MK:268 microphone capsule is 0.3dBA. For this reason the CR:306 must be adjusted to give a reading of 93.7dBA. 7. The instrument is now calibrated. -
Page 11: Technical Specification
CR:306 Sound Level Meter User Manual Page 11 Technical Specification A full technical user manual, including mandated rating plate information is available upon request. Standardisation: IEC 61672-1:2002 Class 2 IEC 60651:1979 Type 2 I Measurement Range: 35dB(A) to 130dB(A) 40dB(C) to 130dB(C) -
Page 12: Appendix 1 - Ce Declaration Of Conformity
Page 12 CR:306 Sound Level Meter User Manual Appendix 1 - 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... -
Page 13: Appendix 2 Acoustic Calibrator Operation
CR:306 Sound Level Meter User Manual Page 13 Appendix 2 Acoustic Calibrator Operation. Switching on the Calibrator Press the Power Button on the end of the Calibrator to switch the unit on. The Indicator will illuminate to show that the unit is operating. -
Page 14: Calibrating A Sound Level Meter
Page 14 CR:306 Sound Level Meter User Manual Calibrating a Sound Level Meter. Push the microphone of the Sound Level Meter into the cavity at the end of the calibrator. Ensure the microphone is fully inserted into the cavity and is past the ‘O’ ring seals. -
Page 15: Changing The Battery
CR:306 Sound Level Meter User Manual Page 15 Changing the Battery The CR:514 & CR:515 acoustic calibrators use a single 9v alkaline battery. This type of battery is known as 6F22 or NEDA 1604. It is also commonly known as PP3. -
Page 16: Specification
Page 16 CR:306 Sound Level Meter User Manual Specification. Frequency 1kHz ± 1% Sound Level 94dB re 20μPa Standardisation CR:514 - IEC 60942:2003 Class 2 CR:515 - IEC 60942:2003 Class 1 Distortion Less than 2% Operating Humidity 25 to 90% Relative Humidity... -
Page 17: Technical Information
CR:306 Sound Level Meter User Manual Page 17 Technical Information The normal mode of operation of the calibrator is with the unit switched on. When the LED indicates the unit is switched on this produces the greatest radio frequency emissions. -
Page 18: Free Field Correction
93.7dB). The table below shows the correction values for the standard microphones of Cirrus Research plc. Calibration corrections are listed below for the Cirrus Research plc ½" Capsules and three microphone capsules commonly used in Calibration Laboratories: Microphone Correction Values... -
Page 19: Warranty Information
13. In the event of any dispute on the terms of the warranty Cirrus Research plc will accept pendulum arbitration by the United Kingdom Institute of Acoustics Ltd. -
Page 20: Cirrus Research Offices
CR:306 Sound Level Meter User Manual 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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