Cirrus Optimus+ Series Instrument Hanbook
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Cirrus Optimus+ Series Instrument Hanbook

Sound level meter
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Summary of Contents for Cirrus Optimus+ Series

  • Page 1 Instrument Handbook Optimus+ Sound Level Meters...
  • Page 2 Optimus sound level meter - instrument handbook About this manual • The instructions in this user manual refer to the operation of Cirrus Research plc Optimus sound level meters with version 5.0 or higher of the firmware. • The instruments described in this manual are the Optimus Yellow (CR:150 series), Optimus Red (CR:160 series), Optimus Green (CR:170 series) and Optimus Purple (CR:190 series).
  • 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

    8.5 Electrical outputs 9. Acoustic calibrator 9.1 Setting up the calibrator 9.2 Calibrating a sound level meter 9.3 Changing the battery 9.4 Specifications 9.5 Technical information 10. EU Declaration of Conformity 11. Product guarantee & extended warranty 12. Cirrus Research offices...
  • Page 5 Optimus sound level meter - instrument handbook Microphone capsule Preamplifier Preamplifier locking ring Ambient light sensor Display Soft keys Control keys...
  • Page 6 Optimus sound level meter - instrument handbook Power button Battery cover screw Battery cover...

  • Page 7: Introduction

    Introduction Welcome to your Optimus sound level meter. This next-generation instrument from Cirrus Research plc is powerful yet simple to use, and is capable of a wide range of noise measurement functions The advanced technology used in Optimus instruments doesn’t get in the way of you making effective noise measurements, and the large, clear screen makes it easy to read the comprehensive information on the display.
  • Page 8 Bluetooth connection A Bluetooth low-energy enabled mobile device can connect to the Optimus via Cirrus-provided apps to allow control, live view and overall measurement downloads remotely, up to 10m away. This will allow you to control an instrument in inaccessible locations, or to easily control...

  • Page 9: First Use

    Optimus sound level meter - instrument handbook First Use Your Optimus sound level meter has been shipped in reusable packaging that should be retained for safe shipment when returning the instrument for calibration or servicing. All Optimus meters come with the following standard accessories: •...
  • Page 10 Optimus sound level meter - instrument handbook...

  • Page 11: Inserting The Batteries

    Optimus sound level meter - instrument handbook Inserting the batteries Your Optimus is powered by 4 x AA alkaline batteries (also called MN1500 or LR6). We recommend that you use alkaline batteries to give the best performance. Remove the battery cover by loosening the captive locking screw (as shown in the diagram below).

  • Page 12: Setting The Clock

    Optimus sound level meter - instrument handbook The instrument is swtiched on by pressing and releasing the on/off button on the left- hand side of the case. After the bootup screen has been displayed, your Optimus will show the last view you used. Setting the clock The Optimus stores the date and time with all the measurements to help with analysing the results and ensuring the accuracy of the data.

  • Page 13: Calibration

    Optimus sound level meter - instrument handbook Calibration All noise measuring instruments should be calibrated before each use because the mircrophone is susceptible to minor damage, even from small knocks. The calibration process applies corrections (if needed) to your instrument’s readings, to ensure that your measurements are as accurate as possible.
  • Page 14 When the calibration is complete, the Optimus will display the level along with the correction or adjustment made. The Optimus is preset with the correction values needed for Cirrus Research microphone capsules, so no manual adjustment is required. The calibration level you should expect is 93.7 dB.

  • Page 15: Making A Measurement

    Optimus sound level meter - instrument handbook Making a measurement Press the ‘start’ key to begin recording (on data logging intruments with the VoiceTag function switched on, the VoiceTag screen will show – press ‘skip’ to move on without recording a note). Your Optimus is now measuring and recording noise data for all available functions, regardless of your selected view, and the red animated running icon will show in the top left of the information bar.

  • Page 16: Operations In More Detail

    Optimus sound level meter - instrument handbook Operations in more detail Press the ‘start’ key to begin recording (on data logging intruments with the VoiceTag function switched on, the VoiceTag screen will show – press ‘skip’ to move on without recording a note). Your Optimus is now measuring and recording noise data for all available functions, regardless of your selected view, and the red animated running icon will show in the top left of the information bar.

  • Page 17: Connectors

    Optimus sound level meter - instrument handbook Soft keys Centre key Arrow keys The ambient light sensor on the front of the instrument will illuminate the keypad and adjust the brightness of the display automatically when the light level fails. If the pause function has been activated (described on page 22), the right soft key switches between pause and stop.

  • Page 18: Screen Saver

    Optimus sound level meter - instrument handbook The Optimus can be powered via the multi-pin connector on the bottom of the instrument. Power can be connected using a ZL:171 Optimus power input cable (2.1 mm power jack, 2 m) or via a ZL:176 Optimus 12 V battery pack cable. The Optimus can also be powered from an external source, such as a USB connection to a PC or via a USB power supply.

  • Page 19: Display

    Optimus sound level meter - instrument handbook Display The Optimus uses a high resolution colour screen to show a clear and easy-to-read display of all the information you need. Audio Recording Timer Mode Active Bluetooth Enabled Trigger Ready Audio Recording Overload Indicator Running External/USB Power...
  • Page 20 ‘bluescreen’ error message will show with an error code. If this should happen to your Optimus, please make a note of the code so the engineers at Cirrus Research can diagnose your problem accurately. After writing down the code, pressing the right key will clear the screen and the instrument can be used as normal.

  • Page 21: Audio Recording

    (standard, high or studio). Details of the audio triggers can be found in Technical Note 28 - Audio Recording with the Optimus Green sound level meters. Please refer to the Cirrus Research plc website at www.cirrusresearch.co.uk/library/optimus. Pressing the audio key again stops the recording. There is no maximum duration of an audio recording set by default, but this can be changed in NoiseTools, and the parameters for the audio triggers can be configured in NoiseTools.

  • Page 22: Back Erase/Pause

    Optimus sound level meter - instrument handbook If the Optimus is paused when an automatic timer begins, the new timed measurement will also be paused. The single timer allows measurements to automatically stop after a pre-defined period of time. If you set the single timer duration to 15 minutes and enable the single timer option, then all measurements will automatically stop after 15 minutes.

  • Page 23: Memory

    To connect to a device, download a Cirrus Optimus app for either Android or iOS (eg dBactive). On the Optimus, go to the advanced options menu and select the Bluetooth page. Enable Bluetooth.
  • Page 24 Optimus sound level meter - instrument handbook The bluetooth symbol in the information bar turns green when connected. Please note: Bluetooth on the Optimus is connected to Port 2, meaning that it cannot be enabled as the same as GPS when used as part of an outdoor measurement kit.

  • Page 25: Getting To Know Your Optimus

    Optimus sound level meter - instrument handbook Getting to know your Optimus - features & capabilities The Optimus instruments are designed around a modular structure that allows an instrument to be upgraded and updated with new capabilities (functions), protecting your investment for the future. To check which capabilities your Optimus has, go to the general view on your Optimus / page 5 (and 6 on some models).
  • Page 26 This is a capability displayed within the 1:3 octave view on some instruments. Instruments with tone detection use either the ISO 1996-2:2007 simplified method or an improved method developed by Cirrus Research, which is based on the ISO standard, extended to include tones between bands, tones in outer bands and Z-weightings. The ISO method only applies to overall data when measuring or reviewing, whereas the Cirrus improved method also applies to instantaneous live values.
  • Page 27 Optimus sound level meter - instrument handbook 5.1.7 Ln view The Ln view shows the statistical Ln values calculated during the measurement. The first seven Ln values are set by default to commonly used values, and 8-14 are definable in NoiseTools. Some Optimus models have a second set which are also 1-7 default, 8-14 user definable.

  • Page 28: High-Level Noise Measurement

    Optimus sound level meter - instrument handbook 5.1.11 Vehicle noise view The vehicle noise view and optional wired remote is designed to meet the requirements of ISO 5130-1982 & §29 StVZO for the noise testing of motor vehicles, suitable for use in workshops, garages and laboratories.

  • Page 29: Menus

    Optimus sound level meter - instrument handbook Menus In the following menus, different options can be chosen on the Optimus. To activate a function, press the ‘mark’ soft key to put a tick in the square box. You can now use the up and down soft arrowkeys to select your setting, and use the ‘OK’...
  • Page 30 Optimus sound level meter - instrument handbook Restore factory settings Restores the instrument back to its original factory setup. AC out On/off +20 dB Gain High levels (70-140 dB) or low levels (20-90 dB) Audio quality Standard quality (16-bit, 16 kHz) Studio quality (32-bit, 96 kHz) Audio triggers On/off...
  • Page 31 Optimus sound level meter - instrument handbook 6.1.7 Storage options Time history rate 2 s, 1 s (default), ½s (500 ms), ¼s (250 ms), 1/8 s (125 ms), 1/10 s (100ms), 1/16 s (62.5ms), 1/100 s (10 ms) Selected rate applies to all measurements including octaves. VoiceTag On/off Single timer...

  • Page 32: Additional Information

    Optimus sound level meter - instrument handbook Additional information Additional information on the following topics can be downloaded from the Cirrus Research website. Please visit www.cirrusresearch.co.uk/library/user-manuals/ for the latest versions of these documents. Technical Note 28 - Recording audio with the Optimus Green (CR:170)

  • Page 33: Appendices

    IEC 61672 test data Technical data for IEC 61672 testing is contained in the Part B document, which can be downloaded from the Cirrus Research plc website. Visit www.cirrusresearch.co.uk/library/user-manuals/ for the latest information. This chapter of the manual contains the overall specifications for the Optimus Yellow (CR:150), Opitmus Red (CR:160), Optimus Green (CR:170) and Optimus Purple (CR:190) sound level meters.
  • Page 34 Optimus sound level meter - instrument handbook Specifications Microphone Class 1 instruments: MK:224 or MK:229 pre-polarized free-field 1/2” Condenser Class 2 instruments: MK:216 pre- polarized free-field 1/2” condenser Microphone preamplifier MV:200 removable preamplifier for Class 1 & Class 2 instruments Measurement range A single measurement range covering 120 dB without any adjustment...
  • Page 35 Optimus sound level meter - instrument handbook Specifications (cont.) Audit store For each measurement, the following data is stored into an independent, non-volatile memory for use with the audit store function: VoiceTag audio recording User selectable recording of voice notes before each measurement for download to NoiseTools software (data logging versions) 30 seconds per recording with...

  • Page 36: Views

    Optimus sound level meter - instrument handbook Views 8.3.1 Sound level view Sound level: Lxy where x = A, C, Z ; y = F, S, I Maximum sound level: LxyMax where x = A, C, Z ; y = F, S, I Minimum sound level: LxyMin where x = A, C, Z ;...
  • Page 37 Optimus sound level meter - instrument handbook L1.0 L5.0 L10.0 L50.0 L90.0 L95.0 L99.0 Lns 7-14 are user defined, turned off by default. Ln values are calculated using 1/16 second LAF samples by default. Sampling rate, time weighting and frequency weighting can be changed in NoiseTools. Instruments with the “statistical levels x 2”...
  • Page 38 Optimus sound level meter - instrument handbook Page 3 LASMax LASMax date and time 8.3.8 Environmental view All language selections other than German: Page 1 LAeq LAymax * Measurement run time Page 2 (Displayed when the instrument is measuring) Graphical display of cumulative Leq for each 1:1 octave band Page 3 (Displayed when the instrument is measuring) Graphical display of cumulative Leq for each 1:3 octave band Page 4...

  • Page 39: Stored Measurements

    Optimus sound level meter - instrument handbook Page 5 (Displayed when the instrument is measuring) Graphical display Lf real time 1:3 octave bands with the highest value for each band (updated every 1/16 second) Tonal noise detection when not set to the ISO option (instruments with Tone Detection Capability only).
  • Page 40 Optimus sound level meter - instrument handbook 8.4.4 1:1 octave band view Overall Leq for each octave band Overall LAeq for each octave band NR & NC values (CR:16xD version, CR:17xA,B & C versions) Time history: Leq for each octave band (10 items) stored at the global data rate (minimum duration of 1/16 seconds) Measurement run time Time &...

  • Page 41: Electrical Outputs

    Optimus sound level meter - instrument handbook 8.4.8 Menu/quick settings The quick settings available are: UK: 3 dB, no threshold, no time weighting, criterion level of 85 dB EU: 3 dB, no threshold, no time weighting, criterion level of 85 dB OSHA HC &...
  • Page 42 DC output cables The DC output is available using a ZL:174 output cable. This cable is available from Cirrus Research plc or your local distributor. Do not use any other cable with the Optimus. This may damage the instrument and invalidate your warranty.
  • Page 43 Optimus sound level meter - instrument handbook Input and output cables ZL:100 - 1 m USB cable ZL:171 - Optimus power input cable, 2.1 mm Power Jack, 2 m ZL:172 - Optimus printer cable, 18-way to 6-way RJ12, 1 m ZL:173 - Optimus DPU-414 printer cable, 18-way to 9-way D male, 1 m ZL:174 - Optimus AC &...

  • Page 44: Acoustic Calibrator

    Optimus sound level meter - instrument handbook Acoustic calibrator information This chapter refers to the use of a Cirrus Research plc CR:514 or CR:515 acoustic calibrator. Setting up 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 45: Changing The Battery

    Optimus sound level meter - instrument handbook The microphone should be parallel to the body of the calibrator. Also ensure that the small bleed-hole next to the microphone cavity is not blocked as this could cause damage to the microphone. Your Optimus sound level meter will automatically make adjustments for the level produced by the acoustic calibrator and the microphone type fitted to the instrument.

  • Page 46: Specifications

    Optimus sound level meter - instrument handbook 1. Unscrew the screw holding the battery cover on, using a coin or the keyring provided. 2. The battery can now be eased out of its holder and replaced. The battery should be eased out terminal side first by pushing against the spring at the other end.
  • Page 47 ‘zero degrees’ or ‘head-on’ incidence, and the pressure level generated by the calibrator. The correction is typically -0.3 dB for Cirrus ½ inch microphones (making the effective calibration level 93.7dB). An example of the procedure used to calculate the value for an MK:224, MK:229 or MK:216 microphone is shown below: Level = 94.0 dB + microphone correction...

  • Page 48: 10 Eu Declaration Of Conformity

    Optimus sound level meter - instrument handbook 10 EU Declaration of Conformity Manufacturer: Cirrus Research plc Acoustic House Bridlington Road Hunmamby Road North Yorkshire YO14 0PH United Kingdom Equipment description The following equipment manufactured after 1st January 2018: CR:151 Sound Level Meter (A & B Versions) CR:152 Sound Level Meter (A &...

  • Page 49: Product Guarantee & Extended Warranty

    2. The initial guarantee covers all faults and accidental damage to the product. 3. Warranty extension If the product is returned to Cirrus Research plc or one of its Authorised Service and Calibration Centres for routine verification and calibration after the initial guarantee period, upon completion of the verification the product will be given an additional free one (1) year warranty.
  • Page 50 7. The user shall be responsible for determining if the product is suitable for use and that such use complies with any applicable laws, regulations or standards. 8. The customer must notify Cirrus Research plc in writing of any claimed defect in the product immediately upon discovering it.
  • Page 51 14. No warranty is offered for used equipment unless a special arrangement is made and is confirmed in writing by Cirrus Research plc 15. Cirrus Research plc reserves the right to amend or update these terms and conditions without notice.

  • Page 52: Cirrus Research Offices

    Optimus sound level meter - instrument handbook 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 website at the address shown below.
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  • Page 56 www.cirrusresearch.co.uk Version 1 - Q4 2018 sales@cirrusresearch.co.uk...

This manual is also suitable for:

Optimus green seriesOptimus red seriesOptimus yellow seriesOptimus purple series

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