1. Manuals
  2. Brands
  3. CASELLA CEL Manuals
  4. Measuring Instruments
  5. CEL-450
  6. Handbook

CASELLA CEL CEL-450 Handbook

Real-time sound level meters
Hide thumbs
Table of Contents

Advertisement

Quick Links

Enlarged version
CEL-450 & CEL-490
REAL-TIME
SOUND LEVEL METERS
Provisional Handbook
HB3307.01
CASELLA CEL
Regent House, Wolseley Road
Kempston, Bedford
MK42 7JY, U.K.
Phone: +44 (0) 1234 844 100
Fax:
+44 (0) 1234 841 490
E-mail: info@casellagroup.com
Web:
www.casellagroup.com
April 2004
CASELLA USA
17 Old Nashua Road #15
Amherst
NH 03031, U.S.A.
Toll Free: +1 800 366 2966
Fax:
+1 603 672 8053
E-mail:
info@casellausa.com
Web:
www.casellausa.com

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the CEL-450 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for CASELLA CEL CEL-450

Summary of Contents for CASELLA CEL CEL-450

  • Page 1 April 2004 CEL-450 & CEL-490 REAL-TIME SOUND LEVEL METERS Provisional Handbook HB3307.01 CASELLA CEL CASELLA USA Regent House, Wolseley Road 17 Old Nashua Road #15 Kempston, Bedford Amherst MK42 7JY, U.K. NH 03031, U.S.A. Phone: +44 (0) 1234 844 100...
  • Page 2 Contents Page 2 - CEL-450/490 Operators Handbook...
  • Page 3 Notes ! The CEL-450 and CEL-490 are supplied complete with Class 1 or Class 2 Electret Microphones and have no need of a 200 V polarizing supply. Therefore no such supply is available and it is safe to ignore the 200 V polarising supply warnings shown on CEL-250 or MK 250 microphone packaging.
  • Page 4 Contents Page 4 - CEL-450/490 Operators Handbook...

  • Page 5: Table Of Contents

    Description ..... 12 CEL-450 Sound Level Meters ... . 14 CEL-490 Sound Level Meter .
  • Page 6 Measurement Functionality ... . . 6.2.1 CEL-450 Versions ....6.2.2 CEL-490 Versions ....

  • Page 7: 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 Figure 1: Display & Key Identities (Further icons may be shown during operation) CEL-450/490 Operators Handbook - Page 7...
  • Page 8 This unit of measurement is specified in the USA: OSHA standard 1910-95 published in 1983. When the period is specified as 8 hours, this measurement unit will be shown as TWA. Percentile sound level. Sound exposure level. Calculated as L Page 8 - CEL-450/490 Operators Handbook...

  • 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

    1.4 Switch Instrument ON/OFF Press to switch the instrument ON. The instrument starts a series of self tests, during which it indicates the instrument type, firmware version, preamplifier type and interface status. Page 10 - CEL-450/490 Operators Handbook...
  • Page 11 Last used setup Finally it enters calibration check mode (described in Chapter 2). The dates and times of the last 4 calibrations are stored. See Section 2.2. CEL-450/490 Operators Handbook - Page 11...

  • 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 PC using the dB23 Windows™ based software. This software has the facilities expected of fully featured Windows™ packages offering post processing, cut and paste between applications, comprehensive word processing capabilities, and extensive on screen graphing facilities. CEL-450/490 Operators Handbook - Page 13...

  • Page 14: Cel-450 Sound Level Meters

    1.6 CEL-450 Sound Level Meters The CEL-450 is ideal for on-site noise surveys and can also monitor personal noise exposure in accordance with European - ISO or USA - OSHA and DOD standards.

  • Page 15: Cel-490 Sound Level Meter

    1.7 CEL-490 Sound Level Meters 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 +12 V DC on the tip and 0 V DC ground on the sleeve. A Casella CEL Universal Power Supply (-PC18) may be used to power the instruments from nominal 110-240 V 50/60 Hz mains supplies.

  • Page 17: Db23 Soundtrack Software

    Introduction 1.9 dB23 SoundTrack Software The CEL-6811 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 5 available. Settings left highlighted on a menu screen become the active options. Note 1: The illustrations in this book are for full featured instruments, other instruments may offer fewer or no options. Page 18 - CEL-450/490 Operators Handbook...

  • Page 19: Preliminary Operations

    2. Select the This is the Main menu. Main menu It gives access to further menus that select: 2 times Measurement Mode, Measurement Setup, Calibration Sequence, Timers Data Recall from Memory, Instrument Configuration, Status. CEL-450/490 Operators Handbook - Page 19...
  • Page 20 7. Select the The highlighted language required will be used for menu language presentation. This setting will also be stored and used next time the instrument is switched Press to return to the Configuration menu. Page 20 - CEL-450/490 Operators Handbook...
  • Page 21 All of the configuration settings that have been left highlighted on the menu screens, plus any changes to the time and date, will be stored for use next time the instrument is switched on. CEL-450/490 Operators Handbook - Page 21...
  • Page 22 Preliminary Operations Page 22 - CEL-450/490 Operators Handbook...

  • Page 23: Select Measurement Mode

    3.2 Select Run Timing Measurements can be timed as follows. Timers Off Manually timed. This allows the user to start and stop a measurement run whenever they want. CEL-450/490 Operators Handbook - Page 23...
  • Page 24 Display screens that are available only for a CEL-490 are shown with a dashed - - - - line. When timed measurements are required, proceed as follows. Operation Press Display Shows Comments 1. Start from This is the Main menu screen. Main menu Page 24 - CEL-450/490 Operators Handbook...
  • Page 25 When the Synchronization Timer is used (√) together with the Duration setting, the run starts at exactly the same time as the first measurement period starting after pressed and continues for the duration set. CEL-450/490 Operators Handbook - Page 25...
  • Page 26 Delay Timer to enable to change quick the entry in the field from X edit to √. mode Save the settings by pressing again to resume normal operation. Press to return to the Timers menu. Page 26 - CEL-450/490 Operators Handbook...

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

    Select and save broadband setups as follows. Operation Press Display Shows Comments 1. Select When the Broadband option Broadband is highlighted, it will be the Measure- bandwidth used. ment as detailed in Section 3.1 CEL-450/490 Operators Handbook - Page 27...
  • Page 28 Save the settings by mode pressing again to resume normal operation. Press to return to the Setup screen. Page 28 - CEL-450/490 Operators Handbook...
  • Page 29 Large Histogram. Large allows the principal parameter shown in large characters on the display to be changed to any of the selected functions. Any L % value between 0.1 and 99.9 can be set. CEL-450/490 Operators Handbook - Page 29...
  • Page 30 1, 5, 10, 15, 20, 30 seconds, 1, 5 10, 15, 20, 30 minutes. Profiles for any of the enabled parameters can be stored. Press to access quick edit to specify measurement and profile periods. Page 30 - CEL-450/490 Operators Handbook...
  • Page 31 The threshold can be set to measure- 0, or in 1 dB steps between ment 70 and 90 dB. U.K legislation requires that the threshold be set to 0. CEL-450/490 Operators Handbook - Page 31...

  • Page 32: Select Narrow Band Measurement Setup

    Changes to user setups are saved for re-use. However any changes to the factory setup will be lost and the standard settings offered each time the instrument is re-started. Select and save narrow band setups as follows. Page 32 - CEL-450/490 Operators Handbook...
  • Page 33 Save the settings by mode pressing again to resume normal operation. Press to return to the Setup screen. CEL-450/490 Operators Handbook - Page 33...
  • Page 34 8. If required, to select a enable (√) field. or disable (X) the enable to change functions quick the entry in the field. edit Save the settings by mode pressing again to resume normal operation. Page 34 - CEL-450/490 Operators Handbook...
  • Page 35 11. If required, to select a enable (√) field. or disable (X) the enable to change quick functions the entry in the field. edit Save the settings by mode pressing again to resume normal operation. CEL-450/490 Operators Handbook - Page 35...
  • Page 36 When the required narrow band setup has been selected, press once to obtain the Narrow Band Measurement screen or twice to obtain the Main menu that gives access to all settings and stored data. Page 36 - CEL-450/490 Operators Handbook...

  • Page 37: Acoustic Calibrtion Check

    CEL-110/1 can also supply a calibration level of 94 dB. However, the exact value to which the instrument must be calibrated will depend on the microphone type in use, its response and the local atmospheric conditions. CEL-450/490 Operators Handbook - Page 37...

  • Page 38: Automatic Calibration Check

    Main menu. Perform an automatic calibration check of the microphone as detailed in Section 4.2, or a manual check as described in Section 4.3 4.2 Automatic Calibration Check of the Microphone The Calibration screen shown after start up allows automatic calibration. Page 38 - CEL-450/490 Operators Handbook...
  • Page 39 FAILED, or CALIBRATED. The Automatic calibration can fail if the input signal is outside the calibration adjustment range (approx. ±6 dB). Refer to Step 6 to change the Auto calibration level. CEL-450/490 Operators Handbook - Page 39...
  • Page 40 (a)When a traceable calibration certificate is available for the acoustic calibrator and/or the sound level meter. (b)To compensate for atmospheric conditions as described in the calibrator instructions. Note 3: The instrument can be set to Autocalibrate to these levels. Page 40 - CEL-450/490 Operators Handbook...

  • Page 41: Manual Calibration Check

    Operation Press Display Shows Comments 1. Start with This is the Calibration Check the Auto screen. calibration It shows the current sound screen level. 2. Highlight This allows manual Auto operation to be selected. CEL-450/490 Operators Handbook - Page 41...
  • Page 42 7. Adjust the More than one key press display to may be required to give a show the visible change in level. correct calibration level for microphone response Page 42 - CEL-450/490 Operators Handbook...
  • Page 43 When the calibration check is complete, press once to obtain a Measurement screen or twice to obtain the Main menu that gives access to all settings and stored data. Note 4: The instrument saves the four most recent calibrations. CEL-450/490 Operators Handbook - Page 43...
  • Page 44 Acoustic Calibration Check Page 44 - CEL-450/490 Operators Handbook...

  • Page 45: Operation

    Section 5.1.2. When narrow band measurement with B and C models is required, change the bandwidth to narrowband as described in Section 3.1, then proceed to Section 5.1.3. CEL-450/490 Operators Handbook - Page 45...

  • Page 46: Broadband Measurement

    Wait 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 to Step 5. Page 46 - CEL-450/490 Operators Handbook...
  • Page 47 On this screen, the time axis completed autoranges depending on profile interval to scroll through through time. Press again to view the other profiled functions. CEL-450/490 Operators Handbook - Page 47...
  • Page 48 Pause screen. 10. When sufficient can be used to end data has measurement only from a been Run screen. collected The current run is stopped and three options are offered. Page 48 - CEL-450/490 Operators Handbook...

  • Page 49: Narrow Band Measurement

    The preset broadband value is always shown in reverse video. The level and frequency of the band marked by the line cursor are identified. to scan the bands. to access other parameters selected for the current measurement. CEL-450/490 Operators Handbook - Page 49...
  • Page 50 5. Select the This allows the bottom end bottom of the displayed scale to be end of the changed, i.e. the offset. dB scale to make the required changes. Page 50 - CEL-450/490 Operators Handbook...
  • Page 51 A data header screen for the data stored current run will be displayed. during the current It indicates the time elapsed narrowband since the start of the run (duration), bandwidth, preamplifier type, range and setup in use. CEL-450/490 Operators Handbook - Page 51...
  • Page 52 14. When all Leave data inspection and required return to the relevant data measurement screen. samples have been inspected Page 52 - CEL-450/490 Operators Handbook...
  • Page 53 Step 9). to select an option, then confirm it by pressing 18. Confirm The current run is ended and end of run all data from the run stored. indicates that the run has stopped. CEL-450/490 Operators Handbook - Page 53...

  • Page 54: Recall Stored Data

    This menu shows the dates the list of on which all runs with the then run Dates specified bandwidth were for the saved (i.e. a specified specified bandwith or all available bandwidth bandwidths). and select required date Page 54 - CEL-450/490 Operators Handbook...
  • Page 55 This screen shows a stored spectrum from the selected narrow narrow band run. band data to display other functions from the selected run. to enable to move the cursor to obtain the level in each band. CEL-450/490 Operators Handbook - Page 55...

  • Page 56: Delete Stored Data

    Memory cursor to the required line. option 3. Move to On this menu, “current” refers to the “current Memory bandwidth”. menu Bandwidth is selected via the Measure Mode option as described in Section 3.1. Page 56 - CEL-450/490 Operators Handbook...

  • Page 57: Format Memory

    (runs) and all user setups from every available bandwidth. USE THIS OPTION WITH GREAT CAUTION ! The option to format the instrument memory is displayed on the final Self Test screen. Proceed as follows. CEL-450/490 Operators Handbook - Page 57...

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

    CEL-495 Preamplifier in place of the Class 1 microphone. These line input adaptors and preamplifiers may also be used with a Class 2 instrument. Then perform an acoustic calibration as described in Chapter 4. Page 58 - CEL-450/490 Operators Handbook...

  • Page 59: Recording

    Now the top of the recording range on the tape (= 0 VU) will occur in the same place as overload on the sound level meter (140 dB or 98 dB depending on the calibration used). CEL-450/490 Operators Handbook - Page 59...

  • Page 60: Replay

    Make a note of the range used for measurement. Proceed with recording the noise signal. 5.5.2 Replay The following guide lines are suggested for replaying sound signals. Page 60 - CEL-450/490 Operators Handbook...
  • Page 61 Press to enter quick edit mode. Date and time of last calibration to select the measurement range that was noted for the measurement. Press again to confirm the calibration and any scale change. CEL-450/490 Operators Handbook - Page 61...
  • Page 62 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 62 - CEL-450/490 Operators Handbook...

  • Page 63: 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 Humidity: 5 to 90% RH in the absence of condensation. Atmospheric pressure: 65 to 108 kPa. Storage Environmental Conditions: Temperature range: -25 to +60 Humidity: 0 to 90% RH in the absence of condensation. Atmospheric pressure: 65 to 108 kPa. Page 64 - CEL-450/490 Operators Handbook...
  • Page 65 Batteries: 4 x LR6 Alkaline cells. Battery Life: Typically 15 hours in broadband mode, 12 hours in narrowband mode. Batteries may be safely left in the instrument whilst operating from an external DC supply. CEL-450/490 Operators Handbook - Page 65...
  • Page 66 Discharge Immunity Tests, IEC 61000-4-3 Electromagnetic compatibility (EMC) - Radiated Electromagnetic Field Tests. IEC 61000-4-6 Electromagnetic compatibility (EMC) - Immunity to Conducted Disturbances induced by Radio Frequency Fields. Tested at 10 V/m or greater. Page 66 - CEL-450/490 Operators Handbook...

  • Page 67: Measurement Functionality

    6.2.1 CEL-450 Versions Measurement Setups: Factory determined setup plus 4 user defined setups for each available operating mode (Broadband, Octave and Third Octave). The last (most recently) used set is saved for each mode. CEL-450/490 Operators Handbook - Page 67...
  • Page 68 Data can be downloaded according to RS 232 standards (or USB with adaptor) to a PC for further manipulation and report preparation under the control of dB23 application software. Page 68 - CEL-450/490 Operators Handbook...

  • Page 69: Cel-490 Versions

    Specification 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. Period Timer: Single period timer from 10 millisecond to 1 hour. Should be divisible by the profile timer.
  • Page 70 Specification Page 70 - CEL-450/490 Operators Handbook...

  • Page 71: Parts & Warranty

    Parts & Warranty PARTS & WARRANTY 7.1 Schedule of Parts A complete CEL-450 Sound Level Meter consists of: CEL-450 Sound Level Meter, Plus as applicable: CEL-250 Class 1 WS2 ( “) Electret Microphone (or MK 250), CEL-495 Class 1 Preamplifier,...

  • 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 Parts & Warranty Page 76 - CEL-450/490 Operators Handbook...

  • Page 77: Menu Structure

    Menu Structure CEL-450/490 Operators Handbook - Foldout...

This manual is also suitable for:

Cel-490

Table of Contents