Cirrus Research CR308 Instrument Handbook Download Page 1 | Manualshive

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Instrument

Handbook

CR:308 & CR:310

Entry-Level

Sound Level Meters

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Summary of Contents for CR308

Page 1: ...Instrument Handbook CR 308 CR 310 Entry Level Sound Level Meters ...

Page 2: ...and CR 310 Any warnings will be indicated by the following symbol The additional information required for testing in accordance with IEC 61672 is provided as a supplementary document Optimus Sound Level Meters Technical Data Part B which is available for download at www cirrusresearch co uk library user manuals It is not possible to change the way that the instrument measures through software or f...

Page 3: ...ht material is identified you will need to obtain permission from the copyright holders concerned Trademarks Cirrus Research plc the Cirrus Research plc Logo doseBadge DOSEBADGE Optimus the NoiseTools Logo and the Noise Hub Logo are either registered trademarks or trademarks of Cirrus Research plc in the United Kingdom and or other countries Microsoft and Windows are registered trademarks of Micro...

Page 4: ...operation 12 6 1 Selecting the frequency and time weighting 12 6 2 Maximum minimum and LCpk values 12 6 3 Setting the level alarm CR 308 only 12 6 4 Performing and printing a measurement CR 310 only 13 7 Instrument calibration 15 8 Specifications and technical information 16 8 1 Instrument specifications 16 8 2 Reference information for periodic testing 16 9 Options and accessories 19 10 Serial co...

Page 5: ...F fast and S slow time response and A and C frequency weightings Additional features include max and min hold for the measurement duration LCpk and limit alarm which you can configure to indicate if your set threshold has been exceeded Except for the alarm indication function the CR 310 includes all the features of the CR 308 In addition it can display the Leq value and print results directly from...

Page 6: ... the following Sound level meter and Class 2 microphone Windshield 2 x AA batteries Optional accessories Class 2 acoustic calibrator You may have other accessories depending on your package Before starting a measurement remove the black microphone protective cap if fitted and where necessary place the windshield carefully over the end of the microphone capsule ...

Page 7: ...CR 308 CR 310 User Manual Page 7 3 Instrument overview Microphone windshield microphone capsule underneath Backlit LCD display Model number Control keypad Power button ...

Page 8: ...Page 8 CR 308 CR 310 User Manual Serial number label Tripod mount Battery compartment USB power input Serial connection for printer CR 310 only AC DC out ...

Page 9: ... CR 310 main display 4 2 Calibration display Press the CAL button Under range indicator Measurement indicator Overload indicator Noise level Alarm indicator CR 308 only Battery level Measurement type Calibrator level Correction to be applied Current measurement level ...

Page 10: ...08 CR 310 User Manual 4 3 CR 308 alarm set display Press 4 4 CR 310 measurement display Threshold level Alarm enabled disabled indicator Under range overload indicator Measurement duration Overall measurement value ...

Page 11: ...m Power on off Softkey Exit Select measurement view A C weighting toggle Reset max min Fast Slow toggle Perform calibration Softkey CAL OK Start stop measurement Power on off Softkey Exit Select measurement view A C weighting toggle Reset max min Fast Slow toggle Perform calibration Softkey CAL Print ...

Page 12: ...AF A frequency weighting fast time weighting LCF C frequency weighting fast time weighting LAS A frequency weighting slow time weighting LCS C frequency weighting slow time weighting To toggle the measurement values press This will toggle through the following measurement values if the meter is set to LAF LAF LAFMax LAFMin LCpk LAF Integrating averaging measurements Lxeq1s and Lxeq8h are available...

Page 13: ... triggered threshold value can be reset by pressing NV this will also reset the maximum minimum and LCpk measurement values 6 4 Performing and printing a measurement CR 310 only Press to start or stop a measurement While a measurement is running the latest values will be displayed on the screen with the measurement duration shown at the bottom Alternative measurement parameters can be viewed by pr...

Page 14: ...Page 14 CR 308 CR 310 User Manual If a printer is attached the results can be printed by pressing Print The measurement view can be cancelled by pressing Exit ...

Page 15: ...CR 514 calibrator Use the arrow keys to set the CORRECT value to 0 2dB which will make the adjustment for the gap between the calibrator and the microphone pressure field of the acoustic calibration and the free field of the instrument and microphone HY 205 microphone This will result in the meter reading 93 8dB when a 94dB calibrator is used Switch on the acoustic calibrator and insert the microp...

Page 16: ...ni USB input Battery life 24 hours with alkaline batteries Microphone pre polarised electret condenser type HY 205 Operating temperature 0 C to 40 C Operating humidity 25 90 Atmospheric pressure 65kPa 108kPa Storage temperature 20 C to 60 C Dimensions 215mm x 68mm x 32mm Weight including batteries 220g Electrical outputs AC tip 3 5mm jack and DC middle 3 5mm jack DC output Voltage 15mV dB range 45...

Page 17: ...uency kHz Free field correction dB 1 0 1 6 3 1 7 1 25 0 1 8 2 6 1 6 0 2 10 4 4 2 0 3 12 5 5 3 2 5 0 5 16 6 5 3 15 0 7 18 7 1 4 1 0 20 7 8 5 1 4 8 2 3 Case reflection and windshield attenuation data Frequency kHz Case correction Windshield correction Uncertainty 63 0 0 0 27 125 0 0 0 27 250 0 13 0 05 0 27 500 0 18 0 08 0 27 1000 0 09 0 1 0 27 2000 0 16 0 26 0 27 4000 0 01 0 53 0 32 8000 0 10 0 26 0...

Page 18: ...Page 18 CR 308 CR 310 User Manual 8 2 4 Directionality plots and case reflection points ...

Page 19: ... number Descriptions CR 308 Basic sound level meter with threshold CR 310 Basic sound level meter with measurement PR 310 Thermal printer for use with CR 310 only CR 514 Acoustic calibrator CK 380 Kit case empty CK 381 CR 308 kit including case meter and calibrator CK 382 CR 310 kit including case meter and calibrator UA 30X Spare windshield CP 65 Carrying pouch for sound level meter and calibrato...

Page 20: ...Page 20 CR 308 CR 310 User Manual 10 Serial connection DB9 RS232 communications rate at 9600 Baud 1 bit start 8 bits data 1 bit stop no parity ...

Page 21: ...und level meter According to EMC Directive 2014 30 EU Low Voltage Directive 2014 35 EU RoHS Directive 2011 65 EU Meet the following standards EN 61000 6 3 2007 A1 2011 Electromagnetic compatibility EMC Generic standards Emission standard for residential commercial and light industrial environments EN 61000 6 1 2007 Electromagnetic compatibility EMC Generic standards Immunity for residential commer...

Page 22: ...n and service centre then the initial 12 month warranty is extended by a further 12 months with the same conditions for up to 15 years in total 3 If a product has not been calibrated annually by Cirrus Research or an authorised calibration and service centre then you may buy back into the warranty scheme for 100 plus the cost of calibration This can only be done once during the life of the product...

Page 23: ...utors and agents are also available from the website at the address shown below United Kingdom Cirrus Research plc Acoustic House Bridlington Road Hunmanby North Yorkshire United Kingdom YO14 0PH T 44 0 1723 891655 E sales cirrusresearch com W www cirrusresearch com Deutschland Cirrus Research GmbH Arabella Center Lyoner Straße 44 48 60528 Frankfurt am Main Deutschland T 49 0 69 95932047 E vertrie...

Page 24: ...Page 24 CR 308 CR 310 User Manual Notes ...

Page 25: ...CR 308 CR 310 User Manual Page 25 Notes ...

Page 26: ...Page 26 CR 308 CR 310 User Manual Notes ...

Page 27: ...CR 308 CR 310 User Manual Page 27 Notes ...

Page 28: ...www cirrusresearch com sales cirrusresearch com ...

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