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Casella CEL-490 Operator's Handbook Manual

Real-time sound level meters
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November 2005
CEL-450 & CEL-490
REAL-TIME
SOUND LEVEL METERS
Operators Handbook
HB3307-04

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Summary of Contents for Casella CEL-490

  • Page 1 November 2005 CEL-450 & CEL-490 REAL-TIME SOUND LEVEL METERS Operators Handbook HB3307-04...
  • Page 2 Contents age 2 - CEL-450/490 Operators Handbook...

  • Page 3: Cel-450/490 Operators Handbook - Age

    Notes ! The CEL-450 and CEL-490 are supplied complete with Class 1 or Class 2 Electret Microphones and have no need of a 200V polarizing supply. Therefore no such supply is available and it is safe to ignore the 200V polarising supply warnings shown on CEL-250 or MK 250 microphone packaging.
  • Page 4 Contents age 4 - CEL-450/490 Operators Handbook...

  • Page 5: Table Of Contents

    CEL-450 Sound Level Meter ... . CEL-490 Sound Level Meter ... . Instrument Power Supplies ... . .

  • Page 6: Getting Started

    CEL-450 Versions ....6.2.2 CEL-490 Versions ....PARTS & WARRANTY .

  • Page 7: Introduction

    Introduction INTRODUCTION Please read Sections 1.1 to 1.4 before commencing measurement. For a quick introduction to instrument operations, Chapter 4 may be used as a tutorial. 1.1 Display & Keys Stop /Run /Pause indicator (Instrument is in Run mode) Battery condition Period number Principal parameter Principal level...
  • Page 8 Introduction The broadband screen in Figure 1 shows one principal and four subordinate parameters, where the principal parameter is a level as identified below. Frequency Weighting Level 980018 Time Weighting The following frequency weightings may be shown: A-, C- and Z- (Linear) weighted. The following time weightings and other identities may be shown.

  • Page 9: Quick Edit

    Figure 2: Quick edit functions 1.2 Quick Edit All control functions for the CEL-450 and CEL-490 are accessed via menu displays. In addition a powerful Quick Edit facility can be invoked by key to allow measurement parameters and settings to be changed quickly and easily on screen.

  • Page 10: Install Microphone, Preamplifier & Batteries

    Introduction 1.3 Install Microphone, Preamplifier & Batteries Screw the Class 1 microphone “finger tight” on to the preamplifier. With the instrument switched OFF, insert the connector of the preamplifier plus Class 1 microphone or Class 2 microphone / preamplifier unit into the socket in the cone at the top of the instrument case.
  • Page 11 Introduction Inst. Type 450/490 CEL49ØA.1 vNN.NN Inst. Version A = Broadband 80 - 190028A - NN B = Octave band C = Third octaves Preamp Class 1 1 = Class 1 None 2 = Class 2 NNNNNN Firmware version Program version and issue Interface status Inst.

  • Page 12: Description

    1.5 Description Both the CEL-450 and CEL-490 Sound Level Meters make use of recent developments in digital processors to feature a full 0 - 140 dB dynamic range on a single uninterrupted scale. In addition, the narrow band versions of these instruments offer real time frequency analysis.
  • Page 13 Introduction Main Menu Measure Mode Bandwidth Setup Select SLM Parameters Setup Parameters Measurement Period Functions Calibration Auto/Man Calibrate Dose Parameters Line input Profiles Timers Run Timer Delay Timer Memory View/ Select Select Delete Directory Data Configure PC Communications Language Backlight Status Date &...

  • Page 14: Cel-450 Sound Level Meter

    Introduction These instruments are constructed to withstand some of the toughest industrial conditions with cases formed from a polyester/ polycarbonate material, giving them a high resistance to damage. Data integrity is further protected by the use of robust electret microphones. 1.6 CEL-450 Sound Level Meter The CEL-450 is ideal for on-site noise surveys and can also monitor personal noise exposure in accordance with European - ISO or USA -...

  • Page 15: Cel-490 Sound Level Meter

    1.7 CEL-490 Sound Level Meter The CEL-490 is recommended for detailed measurements as, in addition to the CEL-450 capabilities described above, it has more comprehensive CEL-450/490 Operators Handbook - Page 15...

  • Page 16: Instrument Power Supplies

    D.C. connector in the bottom of the instrument case. Terminal polarity is +12V DC on the tip and 0V DC ground on the sleeve. A Casella CEL Universal Power Supply (-PC18) may be used to power the instruments from nominal 110-240V 50/60 Hz mains supplies.

  • Page 17: Db23 Soundtrack Software

    1.9 dB23 SoundTrack Software The CEL-6813 dB23 Software enables data collected by the CEL-450 and CEL-490 to be downloaded to a PC for storage, manipulation and the production of reports. It also enables the PC to exercise comprehensive control over the sound level meter.
  • Page 18 Introduction Hints For Using Menus displayed on a menu show which option keys are active. In general, keys move the reverse video cursor from field to field. In general, keys change the entry in the cursor field. at the bottom of a menu list indicates there may be further options.

  • Page 19: Preliminary Operations

    Preliminary Operations PRELIMINARY OPERATIONS 2.1 Select Instrument Configuration (Language, Microphone Response Etc.) Select the language in which the instrument will present menu options. This should be the first operation so that the displays and options will be understood. Similarly, to get the most accurate results, these instruments must be operated with a known microphone directional response and be calibrated for this response.
  • Page 20 Preliminary Operations Operation Press Display Shows Comments 3. Select the Move the reverse video Configure cursor to the required line. Setup option Calibration Memory Configure 4. Move to This menu allows the following items to be set: RS232 Comms Configure RS232 Communication Baud Language menu...
  • Page 21 Preliminary Operations Operation Press Display Shows Comments 8. Select the required microphone response (and other The highlighted entries will configuration items) in the same way. be used. These settings will also be stored and used Date and time are set using the quick edit function as next time the instrument is follows.
  • Page 22 Preliminary Operations Page 22 - CEL-450/490 Operators Handbook...

  • Page 23: Select Measurement Mode

    Select Mode & Setup SELECT MEASUREMENT MODE, TIMER SETTINGS, & SETUP 3.1 Select Measurement Mode (Bandwidth) The measurement mode specifies the bandwidth that is to be used for measurement. Select the measurement mode as follows. Operation Press Display Shows Comments 1.
  • Page 24 Set the Day to 00, to use this as a 24 hour timer. Once set, the timer settings become valid for all bandwidths and setups. Display screens that are available only for a CEL-490 are shown with a dashed - - - - line.
  • Page 25 Timers ON/OFF, Run Duration Timer, with or Delay Timer without Synchronization to the measurement periods, Delay Timer (CEL-490 only) Use up to seven sets of Run Start and Stop times that may be repeated up to 999 times. 4. If required...
  • Page 26 Press to return to the Timers menu. 6. When a The first menu allows the CEL-490 is seven sets of run start and followed being stop times to be repeated Repeat Repeat used, if up to 999 times.

  • Page 27: Select Measurement Setup (Factory- Or User-Prepared Setups)

    Measurements can be made at specified time intervals with storage of period noise data and exceedance (L ) values and profiles. Display screens that are available only for a CEL-490 are shown with a dashed - - - - line. 3.3.1 Select Broadband Measurement Setup The factory setup for broadband measurement contains a set of standard parameters selected for general purpose use.
  • Page 28 Select Mode & Setup Operation Press Display Shows Comments 2. Display the This is the Main menu Main screen with the reverse Measure Mode then menu, and video cursor highlighting the Setup select Setup option. Setup Calibration Timers 3. Move to This menu allows any of the the Setup available setups for...
  • Page 29 Select Mode & Setup Operation Press Display Shows Comments 7. Select This screen allows selection Functions of cumulative (CUM) from the measurement where the Period - - - - - Setup function’s value will be then screen to accumulated both over the Profile enable whole run, and over regular...
  • Page 30 Period measurement is possible only with a CEL-490. The broadband measure- ment period can be set to: 1, 5, 10, 15, 20, 30 seconds, 1, 5, 10 ,15, 20 , 30 minutes, 1 hour, - - - - (=none).
  • Page 31 Select Mode & Setup Operation Press Display Shows Comments 11. Select The Period and Profile Period and functions are set in the AFmx Profile same way as the cumulative Functions functions (√ =enabled, X AFmn from the =disabled) and use the Period weightings set in step 6 Setup...

  • Page 32: Select Narrow Band Measurement Setup

    Select Mode & Setup Operation Press Display Shows Comments The dose normalisation period is the duration to which the actual dose measurements are “normalised” to give comparable L EP,8h results from measure- ments with different durations. Any normalisation period between 1 minute and 24 hours 59 minutes can be set.
  • Page 33 Select Mode & Setup Operation Press Display Shows Comments 1. Select The highlighted option will Octave or be the bandwidth used. Broadband Third Octave Octave Measure- Third Octave ment as detailed in Section 3.1 2. Display the This is the Main menu Main screen with the reverse Measure Mode...
  • Page 34 Select Mode & Setup Operation Press Display Shows Comments 6. Select This screen allows selection Functions of cumulative (CUM) from the measurement where the Period - - - - - Setup function’s value will be then screen to accumulated both over the allow whole run, and over regular measure-...
  • Page 35 Setup Period measurement is then screen to available only with a Max Run Time enable CEL-490. measure- 5 Days 11:26:ØØ ment The predicted maximum run intervals to time with the currently be set selected parameters and...
  • Page 36 Select Mode & Setup Operation Press Display Shows Comments 12. Select This screen allows the range Frequency of frequency bands Third Octave from the measured to be restricted to Z C A Setup a particular range of interest. then screen to 12Hz - 20kHz change the range of...

  • Page 37: Acoustic Calibrtion Check

    Acoustic Calibration Check ACOUSTIC CALIBRATION CHECK 4.1 Start Acoustic Calibration Check It is recommended that a calibration check of the microphone be made both before and after a measurement run. A record of the last calibration before the run and the first calibration after the run are stored. This gives the confidence that the microphone remained calibrated throughout the measurement period.

  • Page 38: Automatic Calibration Check

    Acoustic Calibration Check DO NOT remove the protective metal grid from Class 1 microphones. With a WS2, 1/2" Calibrator microphone, fit the Boss Microphone Coupler calibrator directly on to the microphone, making 1/2" (WS2) sure it is pushed firmly Microphone into contact with the stop in the calibrator cavity (Figure 5).
  • Page 39 Acoustic Calibration Check peration Press Display Shows Comments . Start with This is the Automatic the Auto calibration check screen. calibration It shows the current sound screen level. Auto 114.ØdB Ø9JanØ4 11:28 2. Inspect The last four calibration other levels are stored. Ø3JanØ4 14:23 114.ØdB stored Press...
  • Page 40 Acoustic Calibration Check peration Press Display Shows Comments 5. When the The user is given the option calibration of saving or not saving the new calibration. successful Auto 114.ØdB Press again to use the highlighted option and save SAVE the calibration. Or use highlight NO SAVE to ignore the current calibration and...

  • Page 41: Manual Calibration Check

    Acoustic Calibration Check peration Press Display Shows Comments 7. Edit the Press to change Automatic the level over the range 85.0 calibration to 30.0 dB in 0. dB steps. level Auto 113.8dB Press again to save the new level. Ø9JanØ4 11:28 8.
  • Page 42 Acoustic Calibration Check peration Press Display Shows Comments 3. Select This is the manual calibration Manual check screen. It shows the calibration current sound level and details of the last calibration. Manual If the calibration screen shows a “Scale ... ” line Ø9JanØ4 11:28 instead of “Manual”, the last calibration was...
  • Page 43 Acoustic Calibration Check peration Press Display Shows Comments 8. When the To allow the new setting to level is be saved as the current correct calibration Manual Ø9Jan04 12.22 9. Save the The user is given the option calibration of saving or not saving the new calibration.
  • Page 44 Acoustic Calibration Check Page 44 - EL-450/490 Operators Handbook...

  • Page 45: Operation

    Operation OPERATION 5.1 Measurement With the instrument configured, the calibration checked, timers set and measurement parameters specified as described in the preceding chapters, measurements can be performed as described below. This chapter may also be used as a tutorial to give an idea of how the instrument functions by accepting the currently selected measurement parameters and the last saved calibration.

  • Page 46: Broadband Measurement

    Wed 14 Jan 2ØØ4 displayed shows that this is a Wait Ø9:45:21 while a screen with current date and CEL-490 is time, plus the time at which being used the run will start. 12:ØØ:ØØ Once the run has started, go to Step 5.
  • Page 47 9Ø.1dB 65.ØdB These levels may be seen to change as more data is collected. When using a CEL-490, once the first period has been completed, press to inspect period data from the run. are displayed only when more than one period has been stored.
  • Page 48 Operation Operation Press Display Shows Comments Press to add a cursor readout. Now use move the cursor and to change the dB scaling. Press again to return to normal operation. 7. When all Leave data inspection and ØØØØ18 1:45 required return to the Run screen.

  • Page 49: Narrow Band Measurement

    Operation Operation Press Display Shows Comments Stop Run: End run and store data (go to Step 1). Restart Run: Abort current run and start a new one (return to Step 9). Continue Run: Ignore “Stop” and continue with current run (return to Step 8).
  • Page 50 Operation Operation Press Display Shows Comments 2. If required, The measurement functions change the can be selected as follows. 125Hz 77.3 measure- All broad and narrow bands: ment enable F, S or time weighting with functions quick A, C or Z frequency edit weighting, so that mode...
  • Page 51 Wed 14 Jan 2ØØ4 displayed shows that this is a Wait Ø9:45:21 while a screen with current date and CEL-490 is time, plus the time at which being used the run will start. Once the run has started, go 12:ØØ:ØØ...
  • Page 52 Operation Operation Press Display Shows Comments 10. Inspect This screen shows the further cumulative spectrum saved stored data for the first measurement parameter (in this example ZImx may be used to inspect other data screens saved for the run, for example cumulative data from other functions and period data.
  • Page 53 Operation Operation Press Display Shows Comments 15. If some ØØØ265 8:17 indicates that data sound 1Ø4.2dB collection is paused (for occurs that example while someone must be speaks to the operator), excluded however timing continues from the without interruption. frequency measure- can be used to pause ment...

  • Page 54: Recall Stored Data

    Operation 5.2 Recall Stored Data Data stored in the instrument can be recalled to the display for inspection. This allows the operator to check the quality of results before leaving the test site. To display data from any stored run, proceed as follows. Operation Press Display Shows...
  • Page 55 94.8dB 65.ØdB remaining cumulative parameters from the selected run. When CEL-490 data is being inspected and period data is included in the run, press to display screens containing period data. are displayed when more than one period...

  • Page 56: Delete Stored Data

    Operation Operation Press Display Shows Comments Press then use to scan the band levels manually. Press to cancel. Press to display frequency data from any other parameters stored. Press to display data from other periods stored. 5.3 Delete Stored Data Unwanted data stored in the instrument can be deleted to make room for new data.

  • Page 57: Format Memory

    Operation Operation Press Display Shows Comments 4. Move to This menu shows the dates the list of on which all runs with the Wed 7 Jan2ØØ4 then run Dates specified bandwidth were 9 Jan2ØØ4 for the saved (i.e. a specified specified bandwith or all available 13 Jan2ØØ4...

  • Page 58: Use With Tape And Dat Recorders (Including Calibration For Line Input)

    Operation Operation Press Display Shows Comments 1. Start from This screen offers the 13JanØ4 1Ø:54:42 the final Format option. 512Kb Memory Self Test screen. Perform Step 2 before the Full option is replaced by the Battery Voltage line and the Runs calibration or menu screens.

  • Page 59: Recording

    Operation 4.5.1 Recording DAT recorders have a typical dynamic range of 70 dB, while analog recorders often have less. To ensure the maximum dynamic range for recording while avoiding overload, the 60 to 70 dB range of the recorder must be arranged to accommodate only the top or bottom 60 to 70 dB portion of the 140 dB output from the sound level meter.
  • Page 60 Operation 2.1 mm Coaxial Miniature 8-way DIN DC Power Interface Socket Phono Jack Phono Jack Socket Socket AC line Out AC line In 980037 Figure 6: Bottom panel of the instrument Record about 30 seconds of the calibration signal. A calibration signal with known level is inserted via the sound level meter and recorded, so that when replayed, it gives an indication of the record/replay characteristics of the tape.

  • Page 61: Replay

    Operation Start from the sound level meter Line Input Calibration screen. Broadband L measure mode will be selected automatically by the sound level meter. Connect the recorder output to the instrument IN terminal. Switch the recorder to replay mode. Replay the recorded calibration signal. Adjust the Replay Level control on the recorder so that the sound level meter display indicates the calibration level for the microphone and response used.
  • Page 62 Operation The instrument replay scale now matches the scale used for the recording so that the levels indicated by the display will be correct. Press to display the measurement screen, then replay the recorded material and perform any measurements and analysis required.

  • Page 63: Specification

    Specification SPECIFICATION 6.1 General Standards: The CEL-450/490 series are self contained sound level meters designed to comply with the following international standards. IEC 61672-1 2002-5 (Electroacoustics - Sound Level Meters) Group “X” instruments, performance Class 1 or 2 as relevant to the instrument model.
  • Page 64 Specification Total inherent Noise including microphone thermal noise at 20 degrees C:Typically <18.5 dBA. Frequency Response: 6 Hz to 30 kHz (upper and lower 3 dB frequencies) with Digital sampling rate: 67.2 kHz. Time Weightings: S, F and I according to IEC 61672-1, with only one selected at a time.
  • Page 65 Specification Effect of Temperature: Electrical accuracy of the instrument over -10 to C: < ±0.2 dB Temperature coefficient of CEL-250 Microphone: 0.02 Effect of Humidity: Less than ±0.5 dB over the range 25 to 90% RH (non condensing), relative to the reference conditions. Supplied Microphone: Class 1: CEL-250 ½"...
  • Page 66 Specification Remove the batteries when the instrument is to be out of service for some time. A built in lithium battery will maintain stored data and setup information while the instrument is switched off. External DC Via 2.1 mm Power Connector: 9 to 14V DC at typically 150mA with 1000mA inrush current.

  • Page 67: Measurement Functionality

    Specification Effects of AC Power Frequency Fields: Less than ±0.5 dB change in 74 dBA 925 Hz reference level when subjected to 160 A/m AC magnetic field at 50 and 60 Hz. Menu Languages: English, French, German, Spanish, Italian. Tripod Mounting: Socket to accommodate standard ¼"...
  • Page 68 Specification The last (most recently) used set is saved for each mode. Data Storage: Cumulative data set of overall values for all user specified parameters from all available bandwidths for all runs, plus time history data from up to 4 user specified profiles from the runs. Measurement Times: Fixed measurement durations: 1, 5, 10, 15, 20, 30 minutes,...

  • Page 69: Cel-490 Versions

    PC for further manipulation and report preparation under the control of dB23 application software. 6.2.2 CEL-490 Versions In addition to the features listed for the CEL-450, the CEL-490 has the following. Measured Parameters: See Table 2.
  • Page 70 Specification Page 70 - CEL-450/490 Operators Handbook...

  • Page 71: Parts & Warranty

    Preamplifier Assembly. The following additional items are also included: 016004 (4 off) Alkaline-Manganese Battery 1.5 V (IEC LR6), HB3307 CEL-450/490 Operator’s Handbook. A complete CEL-490 Sound Level Meter consists of: CEL-490 Sound Level Meter, Plus as applicable: CEL-250 Class 1 WS2 ( “) Electret Microphone...

  • Page 72: Instrument Servicing & Warranty

    To obtain repair under warranty, the instrument should be packed and returned in it’s original packing or an equivalent either to CASELLA CEL’s local agent, or in the case of domestic sales, to the CASELLA CEL Service Department at Bedford. Please include the...
  • Page 73 ICMA scheme as required. The warranty will then be extended for the period stated on the individual schedule. Please contact your local CASELLA CEL agent for full details of this service. After the warranty has expired (except on approved accounts) service work is undertaken against quotations, and all packing and transit costs are charged extra.
  • Page 74 Parts & Warranty Page 74 - CEL-450/490 Operators Handbook...
  • Page 75 Parts & Warranty CEL-450/490 Operators Handbook - Page 75...

  • Page 76: Menu Structure

    RS232 Comms Language Auto 114.ØdB Backlight Ø9JanØ4 11:28 Graph Range More 84.6 Options Time & Date AFmx Broadband Microphone Measure AFmn AC Output 16k Hz Narrowband v04011 CEL-450 & CEL-490 REAL-TIME SOUND LEVEL METERS Menu Structure CEL-450/490 Operators Handbook - Foldout...
  • Page 77 Thank you for reading this data sheet. For pricing or for further information, please contact us at our UK Office, using the details below. UK Office Keison Products, P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England. Tel: +44 (0)330 088 0560 Fax: +44 (0)1245 808399 Email: sales@keison.co.uk...

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