Related Manuals for Cirrus CR:800B Series
Summary of Contents for Cirrus CR:800B Series
- Page 1 CR:800B User Manual Page 1 User Manual for the CR:800B Series of Sound Level Meters This manual, the software to which it relates, the program code and drawings are all: © Copyright Cirrus Research plc 1989-2007...
- 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
CR:800B User Manual Page 3 Preface ......................... 6 Messages and Symbols ....................6 Section 1 Introduction....................7 Main Features......................7 Measurement Functions ....................7 Broadband Measurement Mode ..................7 1:1 & 1:3 Octave Band Measurement Mode ..............8 Options & Accessories ....................8 Section 2 Getting Started ..................... - Page 4 Page 4 CR:800B User Manual Measurement Duration....................31 Measurement Auto Repeat..................33 Measurement Auto Synchronise .................. 34 Measurement Range ....................35 Instrument Setup...................... 37 Display Contrast ........................37 Time & Date.........................38 Calibration Level ........................38 Display Resolution ........................39 Time Weighting ........................40 Frequency Weighting......................41 Ln values..........................41 User Metric ..........................42 Configuring the instrument from the Deaf Defier3 software ............43...
- Page 5 Example ..........................78 Appendix 5 Software Installation ................79 System Requirements....................79 Installation Requirements................... 79 Appendix 6 Configuring the instrument from the software......... 80 Appendix 7 CE Certificate of Conformity ..............81 Warranty Information....................82 Cirrus Research Offices ....................83...
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Page 6: Preface
Page 6 CR:800B User Manual Preface Thank you for purchasing the CR:800B Sound Level Meter. This powerful instrument provides excellent expansion capability, and has been designed to provide reliable, accurate measurements over a long period of time. This manual describes the procedure that should be followed to set up and operate the CR:800B Sound Level Meter, as well as comprehensive technical information, using optional accessories as well as troubleshooting. -
Page 7: Section 1 Introduction
CR:800B User Manual Page 7 Section 1 Introduction Main Features Measurement Functions The measurement functions that can be provided by the CR:800B depend upon the options that have been fitted. If the instrument has been fitted with the 1:1 Octave Band or the 1:3 Octave Band filters, these measurements will be available. -
Page 8: 1:1 & 1:3 Octave Band Measurement Mode
20Hz and 20kHz 1:3 Octave Band Filters. Options & Accessories The CR:800B Series are also available with a range of options and accessories that can enhance the performance and applications of the instrument. For full details, please contact Cirrus Research plc or your local representative. -
Page 9: Section 2 Getting Started
CR:800B User Manual Page 9 Section 2 Getting Started How to... These example settings are designed to demonstrate the different configurations that are available from the CR:800B Sound Level Meters. Please check the configuration of the instrument to match the measurement requirements of your application before making a measurement. -
Page 10: Quick Start
Page 10 CR:800B User Manual Quick Start Switch on Key Press Display When the instrument has switched on, the start-up screen will change to the standard noise level display. Calibrate the Sound Level Meter If a microphone extension cable is to be used during a measurement, the instrument must be calibrated with the cable attached. -
Page 11: Set The Measurement Duration
CR:800B User Manual Page 11 If the calibration is successful , press the exit key to return to the main screen. Set the measurement duration Press the menu key to view the current measurement duration and the status of the auto repeat and auto synchronise function. -
Page 12: Change The Measurement Function
Page 12 CR:800B User Manual Refer to page 35 for details of setting the measurement range and the use of the bar graph display in choosing the correct measurement range. Change the measurement function To check the current measurement function and to change the measurement function, press the menu key. -
Page 13: Review The Measurement
CR:800B User Manual Page 13 To stop the measurement, press the Stop Key. Key Press Display Comments The instrument stores the measurement in memory and enters the measurement review mode. Review the measurement When the measurement has been stopped, the instrument automatically stores the measurement in memory and enters the measurement review mode. -
Page 14: Unpacking And Checking The Sound Level Meter
Carefully remove the instrument from its shipping container and inspect it for possible damage or missing items. If the meter appears to be damaged or something is missing, contact Cirrus Research plc or your local representative immediately. The basic CR:800B instrument is supplied with the following standard accessories:... - Page 15 CR:800B User Manual Page 15 Drop the preamplifier into the socket on the Sound Level Meter Ensure the connector has located into the socket Tighten the Locking Ring. Do not cross thread the locking ring. Damage caused by misuse is not covered by the warranty for the instrument.
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Page 16: Using Microphone Extension Cables
Page 16 CR:800B User Manual Using Microphone Extension Cables The CR:800B instruments can be used with a microphone extension cable if the instrument is fitted with the removable preamplifier. If a microphone extension cable is to be used during a measurement, the instrument must be calibrated with the cable attached. -
Page 17: Using An External Power Supply
Windshield The CR:800B Series can be used with a UA:237 90mm Foam Windshield which will reduce the noise levels generated by air turbulence over the microphone capsule. The windshield can also be used to protect the microphone capsule of the Sound Level Meter from dust and fluids which may affect the performance of the instrument. -
Page 18: Switching On
Page 18 CR:800B User Manual Switching On Key Press Display When the instrument is first switched on, a Welcome screen is shown with the instrument type and version number. After 3 seconds, the display will change and the current Sound Level will be shown with the current configuration shown as above. In this example, the instrument is showing the Fast A-Weighted Sound Level with the current Date and Time shown at the bottom of the screen. -
Page 19: Checking The Configuration Of The Instrument
CR:800B User Manual Page 19 Checking the Configuration of the Instrument The Setup of the instrument should be checked before making a measurement. Time and Date Key Press Display Comments The current time and date are shown at the bottom of the screen. -
Page 20: Measurement Mode
Page 20 CR:800B User Manual Measurement Mode Key Press Display Comments The current measurement mode is shown on the screen. In this example, the measurement mode is Broadband. Measurement Duration Key Press Display Comments The measurement duration is shown at the bottom of the screen. -
Page 21: Measurement Auto Repeat
CR:800B User Manual Page 21 Measurement Auto Repeat Key Press Display Comments The status of the Auto Repeat is shown at the bottom of the screen. In this example, the Auto Repeat is switched on. When the Auto Repeat is switched off, the display is Repx Measurement Auto Synchronise Key Press... - Page 22 Page 22 CR:800B User Manual Attach the Acoustic Calibrator to the Sound Level Meter, and press the menu key. The first menu option is Calibrate. Key Press Display Comments Select 94dB on the Acoustic Calibrator before starting the calibration procedure. If the calibration is sucessful, the instrument will display the calibration information screen.
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Page 23: Starting A Measurement
CR:800B User Manual Page 23 The calibration level is unstable. The background noise level may be too high or the Acoustic Calibrator may not be fitted correctly to the Sound Level Meter. Refer to the troubleshooting section on page 54 for further information. -
Page 24: 1:3 Octave Band Mode
Page 24 CR:800B User Manual 16kHz 1:1 Octave Band, the instrument will measure a dB(A), dB(C) and then a dB(Z) value and then stop, storing the measurement in the memory. The user can override the automatic sweep by pressing the Up arrow key to step to the next frequency band. -
Page 25: Displaying The Data During A Measurement
CR:800B User Manual Page 25 The instrument has not accumulated sufficient data to give an accurate measurement. When enough information has been gathered, the LZeq value will be displayed. Displaying the data during a measurement Broadband Mode During a Broadband Mode measurement, the user can step through the different measurement parameters. -
Page 26: Pausing And Resetting A Measurement
Page 26 CR:800B User Manual The Sound Level is shown, in this case the LAF. The real time display of the noise level is shown as 1 second Leq samples. The display shows 2 minutes of information and then starts to scroll across the screen. -
Page 27: Viewing The Stored Measurements
CR:800B User Manual Page 27 At any time during a measurement, the user can stop the measurement. The data will be automatically stored in memory, and the display will change to the memory review mode. Key Press Display Comments When the Stop key is pressed, the current measurement is stored in the memory and the display changes to the memory review... -
Page 28: Section 3 Configuring The Sound Level Meter
Page 28 CR:800B User Manual Section 3 Configuring the Sound Level Meter This section of the manual covers the configuration of the Sound Level Meter and the different options that are available to the user. Keypad Move through the measurement parameters when running a measurement. Move through the stored measurement parameters in memory recall mode. -
Page 29: Measurement Mode
CR:800B User Manual Page 29 Measurement Mode To select the Measurement Mode, press the Menu Key. The current measurement mode is displayed. Please note that the CR:800B Sound Level Meters will revert to Broadband Measurement Mode when the instrument is switched off. Key Press Display Broadband Mode... -
Page 30: 1:1 Octave Band Mode
Page 30 CR:800B User Manual 1:1 Octave Band Mode To select the 1:1 Octave Band Measurement Mode: Key Press Display 1:3 Octave Band Mode To select the 1:1 Octave Band Measurement Mode: Key Press Display... -
Page 31: Measurement Duration
CR:800B User Manual Page 31 Measurement Duration The configuration of the Run Duration, the Auto-Repeat and the Auto-Synchronise functions are all connected and affect each other. Always ensure that the status of these three functions is checked before making a measurement. - Page 32 Page 32 CR:800B User Manual In this example, the measurement duration is set to 15 Minutes, and the instrument will run continuously until the Stop key is pressed. The change the measurement duration, use the Up and Down keys to select the require duration and press OK to select. In addition to the preset measurement durations, the user can define the measurement duration using the Set User Time Option.
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Page 33: Measurement Auto Repeat
CR:800B User Manual Page 33 to 15 minutes, the CR:800B instrument will take a total of 15 minutes to complete the sweep through the frequency bands. To meet the accuracy required by the standards to which the instrument is designed to meet, there is a minimum time required to measure each frequency band. -
Page 34: Measurement Auto Synchronise
CR:800B User Manual Measurement Auto Synchronise This function is new to the CR:800B Series and allows the start of the measurements to be started in time with the clock of the instrument. The diagram below shows how the measurement runs from when the Start key is pressed for the duration defined by the Run Duration. -
Page 35: Measurement Range
CR:800B User Manual Page 35 When the Auto Synchronise function has been selected, the display will show the Sync at the bottom of the screen with a tick next to it as shown above. Measurement Range One of the most important features of a Sound Level Meter is the measurement range. If the measurement range is set too high, the instrument may not be able to record low levels. - Page 36 Page 36 CR:800B User Manual The measurement range is 10dB to 80dB and the noise level is 90.2dB. The instrument is overloading and the O/L symbol is shown. The measurement range is 70dB to 140dB and the noise level is 58.9dB.
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Page 37: Instrument Setup
CR:800B User Manual Page 37 Instrument Setup Select the Setup option from the main menu and press OK. Key Press Display Comments Display Contrast To adjust the contrast of the display, select the Contrast Option and press OK Key Press Display Comments Select the Lighter or Darker option... -
Page 38: Time & Date
Page 38 CR:800B User Manual Time & Date To change the Date and Time, select the Set Clock option from the Setup Menu. Key Press Display Comments To set the Time, select the Time option and press OK Use the Up and Down arrow keys to change the numbers and the left and right arrow keys to move between the numbers. -
Page 39: Display Resolution
CR:800B User Manual Page 39 The default calibration level is 93.7dB for use with Cirrus Research plc CR:510 Series Acoustic Calibrators set to the 94dB setting. The correction of –0.3dB is required to suit the MK:224 and MK:216 Microphone capsules used by the CR:800B Series. -
Page 40: Time Weighting
Page 40 CR:800B User Manual Use the Up and Down arrows keys to select the display resolution and press OK to select the required display resolution. Press Exit to return to the main display. Time Weighting The Time Weighting of the instrument can be set to either Fast, Slow or Impulse. To set the Time Weighting, select the Time Weighting option from the menu: Key Press Display... -
Page 41: Frequency Weighting
CR:800B User Manual Page 41 Frequency Weighting The Frequency Weighting of the instrument can be set to either A, C or Z. To set the Frequency Weighting, select the Frequency Weighting option from the menu: Key Press Display Comments Select the required Frequency Weighting and press OK to select. -
Page 42: User Metric
Page 42 CR:800B User Manual Key Press Display Comments The Ln to be changed can be selected using the Up and Down arrow keys. Press OK to select the Ln to change. In this example, the Ln1 has been selected. Use the Up and Down arrow keys to change the value and the Left and Right arrow keys to move... -
Page 43: Configuring The Instrument From The Deaf Defier3 Software
CR:800B User Manual Page 43 Select the required User Metric and press OK to select. The select User Metric is indicated by a tick. Press Exit to return to the main display. Note that if the LIeq,t function is selected, the CR:800B will automatically select the Impulse Time Weighting which will apply to all other measurement functions described in section Time Weighting on page 40. -
Page 44: Section 4 Viewing And Downloading The Measurements
Page 44 CR:800B User Manual Section 4 Viewing and Downloading the measurements When a measurement stops, either by the user pressing the Stop key or when a measurement stops automatically, the data is automatically stored in the memory. Recalling Stored Measurements To view stored measurements, ensure that the instrument is not running. -
Page 45: Broadband Measurement
CR:800B User Manual Page 45 Broadband Measurement Key Press Display Comments The User Metric setting of the instrument determines if the unit stores LAE, LAIeq,t or LAFTeq. If the unit was in Overload or Under-Range during the measurement this is indicated on the screen. -
Page 46: 1:3 Octave Band Measurements
Page 46 CR:800B User Manual 1:3 Octave Band Measurements Key Press Display Comments The graphical display of the 1:3 Octave Band measurement is shown with the measurement range shown on the left hand scale. - Page 47 CR:800B User Manual Page 47...
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Page 48: Checking & Clearing The Memory
Page 48 CR:800B User Manual Checking & Clearing the memory The memory of the instrument can be checked for available space and also to allow the user to delete the measurements that are stored. To check the available memory, select the Memory option from the menu: Key Press Display Comments... -
Page 49: Downloading Measurements To The Software
This connection requires a free 9 Pin RS232 Serial port on the PC. If no RS232 port is available, a USB Adaptor (ZL:101) is available as a cost option. Please contact your local representative or Cirrus Research plc for further information. - Page 50 Page 50 CR:800B User Manual Connect the ZL:800 Cable to the RS232 socket, (2) in the diagram above, on the bottom of the instrument. Ensure that the cable is inserted correctly with the arrow on the top of the connector. Do not force the connector into the socket as this may cause damage.
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Page 51: Understanding How The Measurements Are Stored
CR:800B User Manual Page 51 Understanding how the measurements are stored The memory of the CR:800B can store up to 1,300 measurements. Each measurement is known as an Event and can be either Broadband, 1:1 Octave Band or 1:3 Octave Band. - Page 52 Page 52 CR:800B User Manual The diagram below shows an example of this.
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Page 53: Section 5 Maintenance & Care
If you experience any problems with the operation of the instrument, refer to page 54 for basic troubleshooting. If this does not solve the problem, contact Cirrus Research plc or your local representative for further assistance. -
Page 54: Section 6 Troubleshooting
This section contains information which may solve simple operational problems you may encounter. If you are unable to solve the problem or experience any problems with the assembly or operation of the instrument contact Cirrus Research plc or your local representative for further assistance... -
Page 55: Downloading Measurements
CR:800B User Manual Page 55 stored See page 48 The measurement was reset Restart the measurement In 1:1 or 1:3 Octave Band The Run Duration has been set Select a Preset Run Duration Mode, the filters do not to Manual. automatically sweep The measurements are not The Auto-Synchronise function... -
Page 56: Section 7 Glossary
Page 56 CR:800B User Manual Section 7 Glossary 1:1 Octave Band Filters A division of the frequency range into bands, the upper frequency limit of each band being twice the lower frequency limit. 1:3 Octave Band Filters Single 1:1 Octave bands divided into three parts. A Weighting A standard weighting of the audible frequencies designed to reflect the response of the human ear to noise. - Page 57 CR:800B User Manual Page 57 Sound level with ‘A’ Frequency weighting and Fast Time weighting The maximum Sound level with ‘A’ Frequency weighting AFmax and Fast Time weighting The minimum Sound level with ‘A’ Frequency weighting and AFmin Fast Time weighting Takt maximal sound level as defined by DIN 45641 AFTeq Sound level with ‘A’...
- Page 58 Page 58 CR:800B User Manual Sound level with ‘Z’ Frequency weighting and Impulse Time weighting The maximum Sound level with ‘Z’ Frequency weighting ZImax and Impulse Time weighting Sound level with ‘Z’ Frequency weighting and Slow Time weighting The maximum Sound level with ‘Z’ Frequency weighting ZSmax and Slow Time weighting Overload...
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Page 59: Appendix 1 Menu Structure
CR:800B User Manual Page 59 Appendix 1 Menu Structure The structure of the menu system of the CR:800B Sound Level Meter is shown below for reference. - Page 60 Page 60 CR:800B User Manual...
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Page 61: Appendix 2 Rating Plate Information
CR:800B User Manual Page 61 Appendix 2 Rating Plate Information The CR:800B meets IEC60651:1979 and IEC60804 1985. These specifications require that this manual provides detailed information to verify that the specifications are met. While much of the data required is in the body of this manual, the points required to be detailed are listed below in the order in which they occur in the IEC specification. - Page 62 Page 62 CR:800B User Manual 30-100dB 28-100dBA 28-80dBA 28-100dBA 30-100dBC 36-100dBC (26-101dBA) (25-81dBA) (25-101dBA) (28-101dBC) (34-101dBC) 20-90dB 18-90dBA 18-70dBA 18-90dBA 24-90dBC 36-90dBZ (15-91dBA) (15-71dBA) (14-91dBA) (22-91dBC) (34-91dBZ) 10-80dB 18-80dBA 18-65dBA 18-80dBA 18-80dBC 36-90dBZ (15-81dBA) (15-67dBA) (16-81dBA) (21-81dBC) (35-91dBZ) The range of measurement for Peak measurement is:- : 60 to 143 dB(C) The peak values are valid for 3dB above and 40dB below the top of each range unless overload occurs.
- Page 63 Any real, positive impedance of zero ohm upwards. Optimum load impedances are specified in this manual. No guarantee on performance can be made if non-Cirrus supplied cables are used. IEC804 11.2.6 IEC651 11.2.19 The reference frequency used for calibration is 1kHz.
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Page 64: Additional Filter Information
IEC651 11.2.22 Not applicable. IEC804/651 11.2.23 See microphone data. IEC804/651 11.2.24 Consult Cirrus Research plc IEC804/651 11.2.25 Dummy microphone impedance is 18 pF in series with 50ohm. IEC651 11.2.26 Primary indicator range is 55dB to 95dB on the centre reference range. - Page 65 CR:800B User Manual Page 65 IEC1260 7b The filters are designed using switched capacitor filters preceeded by passive anti- aliasing filters and followed by passive clock noise filters. IEC1260 7c The filter centre frequencies are changed by application of a clock frequency that is one hundred times the selected centre band frequency.
- Page 66 The CR:800B will indicate when a low battery condition is approaching or has been exceeded. IEC1260 7t The filter is integral to the CR:800B IEC1260 7u The instrument is fully functional 10 seconds after switch on but a one minute wait is preferable for best accuracy. IEC1260 7v Consult Cirrus Research plc...
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Page 67: Appendix 3 Specifications
CR:800B User Manual Page 67 Appendix 3 Specifications Instrument Versions CR:811B Type 1 CR:812B Type 2 CR:821B Type 1 with 1:1 Octave Band Filters CR:822B Type 2 with 1:1 Octave Band Filters CR:831B Type 1 with 1:1 & 1:3 Octave Band Filters CR:832B Type 2 with 1:1 &... - Page 68 Page 68 CR:800B User Manual Measurement Range Broadband 21dB(A) to 140dB(A) Type 1 25dB(A) to 140dB(A) Type 2 143dB(C) Peak (70 to 140dB Range) 1:1 Octave Band Filters 19dB(Z) to 140dB(Z) 1:3 Octave Band Filters 14dB(Z) to 140dB(Z) Range Steps 10-80, 20-90, 30-100, 40-110, 50-120, 60-130, 70-140 Noise Floor (Typical) Broadband...
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Page 69: Memory
CR:800B User Manual Page 69 1:1 Octave Band 31Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz 1:3 Octave Band 25Hz, 31Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz, 2kHz, 3,15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kHz 20Hz &... -
Page 70: Batteries
Page 70 CR:800B User Manual Batteries 2 x 1.5v Alkaline LR6/AA Battery Life Broadband Typically >30 hours Filter Mode Typically >20 hours Battery voltage is continuously monitored and warning is given on display of impending low battery condition. When batteries approach end of life the unit will store any data required and switch off automatically. -
Page 71: Output Cables
CR:800B User Manual Page 71 DC output DC log signal of the above with time constant as selected. DC Output = (Level - [Top of Range value] +33dB) /41 giving approximately 24.4mV/dB DC Output is affected by: Measurement Range Time Weighting Frequency Weighting Output Impedance DC Output... -
Page 72: Electromagnetic Performance
Page 72 CR:800B User Manual MO:800/4 Upgrade from 1:1 to 1:1 & 1:3 Octave Band Filters MO:800/5 Remote Preamplifier for Type 2 Instruments MO:800/6 20Hz & 20kHz 1:3 Octave Band Filters Electromagnetic Performance EN 55022:1994 EN 61000-4-2:1995 EN 61000-4-3:1996 80MHz - 1GHz EN 61000-4-3:1996 25MHz - 80MHz EN 50204:1995... -
Page 73: Appendix 4 Acoustic Calibrators
CR:800B User Manual Page 73 Appendix 4 Acoustic Calibrators 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. The calibrator will automatically switch off after 5 minutes to preserve battery power. -
Page 74: Calibrating A Sound Level Meter
Page 74 CR:800B 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 75: Changing The Battery
CR:800B User Manual Page 75 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. Unscrew the screw holding the battery cover on, using a coin. The battery, type 6F22 (PP3) can now be eased out of its holder and replaced. -
Page 76: Specification
Page 76 CR:800B 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 Operating Static Pressure 65 kPa to 108kPa Operating Temperature C to +50... -
Page 77: Technical Information
CR:800B User Manual Page 77 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. The calibrator continues to function after exposure to contact discharges up to 4kV and air discharges up to 8kV, for both positive and negative voltages relative to earth ground. -
Page 78: Free Field Correction
The correction is typically -0.3dB for ½ inch microphones (making the effective calibration level 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... -
Page 79: Appendix 5 Software Installation
Page 79 Appendix 5 Software Installation The CR:800B Series are supplied with the Deaf Defier3 software on a CD-ROM. Deaf Defier3 is suitable for PC’s running Microsoft Windows 95 or later, including WindowsXP and Windows2000. Deaf Defier3 is supplied on CD-ROM, with a full... -
Page 80: Appendix 6 Configuring The Instrument From The Software
Page 80 CR:800B User Manual Appendix 6 Configuring the instrument from the software The configuration of the instrument can be set from within the Deaf Defier3 software. Different configurations can be saved and loaded into the instrument to suit different measurement applications and standards. -
Page 81: Appendix 7 Ce Certificate Of Conformity
CR:800B User Manual Page 81 Appendix 7 CE Certificate 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 82: Warranty Information
14. 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 83: Cirrus Research Offices
Page 83 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.
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