Cirrus Research Entry-Level CR:308 Instrument Handbook
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Cirrus Research Entry-Level CR:308 Instrument Handbook

Sound level meters
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CR:308 & CR:310
Entry-Level
Sound Level Meters

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Summary of Contents for Cirrus Research Entry-Level CR:308

  • Page 1 Instrument Handbook CR:308 & CR:310 Entry-Level Sound Level Meters...
  • Page 2 CR:308 & CR:310 – User Manual About this manual The instructions in this user manual refer to the operation of Cirrus Research plc CR:308 and CR:310 entry-level sound level meters. The instruments described in this manual are the CR:308 and CR:310.
  • Page 3 You must not modify text, images or illustrations in any way. The material must be acknowledged as Cirrus Research plc copyright, and you must give the title of the source document/publication. Where any third-party copyright material is identified, you will need to obtain permission from the copyright holders concerned.

  • Page 4: Table Of Contents

    Instrument calibration ............................15 Specifications and technical information ......................16 Instrument specifications ............................16 Reference information for periodic testing ......................16 Options and accessories ..........................19 Serial connection ............................20 Declaration of Conformity ..........................21 Product guarantee and extended warranty .....................22 Cirrus Research contact details .........................23...

  • Page 5: Introduction

    CR:308 & CR:310 – User Manual Page 5 1 Introduction Welcome to your new CR:308/CR:310 entry-level sound level meter. The CR:308 and CR:310 are general-purpose digital sound level meters designed to IEC 61672 Class 2. The instrument has ‘F’ (fast) and ‘S’ (slow) time response and ‘A’ and ‘C’ frequency weightings.

  • Page 6: First Use

    Page 6 CR:308 & CR:310 – User Manual 2 First use Before using your meter for the first time, please check the contents of your instrument’s case, which should include the following: • Sound level meter and Class 2 microphone •...

  • Page 7: Instrument Overview

    CR:308 & CR:310 – User Manual Page 7 3 Instrument overview Microphone windshield (microphone capsule underneath) Backlit LCD display Power button Control keypad Model number...
  • Page 8 Page 8 CR:308 & CR:310 – User Manual Serial number label Tripod mount Battery compartment Serial connection for printer (CR:310 only) AC/DC out USB power input...

  • Page 9: Instrument Displays

    CR:308 & CR:310 – User Manual Page 9 4 Instrument displays 4.1 CR:308 & CR:310 main display Under-range indicator Measurement indicator Overload indicator Measurement type Noise level Alarm indicator Battery level (CR:308 only) Calibration display Press the CAL button. Calibrator level Correction to be applied Current...

  • Page 10: Cr:308 Alarm Set Display

    Page 10 CR:308 & CR:310 – User Manual 4.3 CR:308 alarm set display Press Alarm enabled/disabled indicator Threshold level 4.4 CR:310 measurement display Under-range/ Overall overload indicator measurement value Measurement duration...

  • Page 11: Instrument Keypads

    CR:308 & CR:310 – User Manual Page 11 5 Instrument keypads 5.1 CR:308 keypad Set alarm Power on/off Softkey: Exit Perform calibration Softkey: CAL/OK Fast/Slow toggle Select measurement view Reset max/min A/C weighting toggle 5.2 CR:310 keypad Start/stop measurement Power on/off Perform calibration Softkey: Exit Softkey: CAL/Print...

  • Page 12: Instrument Operation

    Page 12 CR:308 & CR:310 – User Manual 6 Instrument operation Fit new batteries by sliding the battery cover open and inserting two AA batteries in the correct orientation. Switch on and allow the instrument to settle for 60 seconds before calibrating. Before starting a measurement, calibrate the instrument as per the guidance in Section 7 of this user manual.

  • Page 13: Performing And Printing A Measurement (Cr:310 Only)

    CR:308 & CR:310 – User Manual Page 13 To set the alarm level, press to enter the alarm setup display. Set the desired level and enabled the alarm by using the arrow buttons. A tick denotes that the alarm is active; a cross denotes that the alarm is disabled. When set, press to confirm.
  • 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: Instrument Calibration

    7 Instrument calibration Before each measurement, it is important to calibrate your instrument with an acoustic calibrator, such as the Cirrus Research CR:514 1kHz 94dB calibrator. To start the process of calibration, ensure the microphone is fitted correctly and place the acoustic calibrator over the microphone.

  • Page 16: Specifications And Technical Information

    Page 16 CR:308 & CR:310 – User Manual 8 Specifications and technical information 8.1 Instrument specifications Applicable standards IEC 61672-1: 2013 Class 2 Measurement range 30dB(A) – 130dB(A) 40dB(C) – 130dB(C) Frequency weighting A and C Time weighting Fast (F) and Slow (S) Display functions Normal, Maximum, Minimum, CPeak Measurement functions...
  • Page 17 CR:308 & CR:310 – User Manual Page 17 8.2.1 Multifrequency acoustic calibrator correction data (set to pressure and test on A- weighting) Frequency Correction 125Hz 1kHz 8kHz 8.2.2 Free field correction for HY205 microphone Frequency (kHz) Free field correction (dB) Frequency (kHz) Free field correction (dB) 1.25...
  • Page 18 Page 18 CR:308 & CR:310 – User Manual 8.2.4 Directionality plots and case reflection points...

  • Page 19: Options And Accessories

    CR:308 & CR:310 – User Manual Page 19 9 Options and accessories The following table contains information about the model options and accessories available with this sound level meter. Cirrus Research part number Descriptions CR:308 Basic sound level meter with threshold CR:310...

  • Page 20: Serial Connection

    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: Declaration Of Conformity

    CR:308 & CR:310 – User Manual Page 21 11 Declaration of Conformity Manufacturer: Cirrus Research plc Acoustic House Bridlington Road North Yorkshire YO14 0PH United Kingdom Telephone: +44 (0)1723 891655 Equipment manufactured after June 2018. Equipment description CR:308 sound level meter...

  • Page 22: Product Guarantee And Extended Warranty

    This two-year period covers failure and poor workmanship only. 2. If the product is calibrated by Cirrus Research or an authorised calibration 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.

  • Page 23: Cirrus Research Contact Details

    Page 23 13 Cirrus Research contact details In addition to independent sales channels in the UK, Germany and France, Cirrus Research also operates through approved distributors and agents in many countries worldwide. For details of your local representative, please contact Cirrus Research using the information below. Contact details for Cirrus Research authorised distributors and agents are also available from the website at the address shown below.
  • 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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Entry-level cr:310

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