| Casella/CEL 400 Series Real-time Sound Level Analyzers |
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CEL 450/490 Real Time Analyzers
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Casella 450 Applications, Operation and Use and Specifications
Casella 490 Applications, Operation and Use and Specifications |
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Casella 400 Series Overview
The new CEL-400 series is an advanced and comprehensive instrument family for a wide range of applications. It has been designed for convenience and ease of use in many popular tasks. From simple workplace noise surveys to full community noise audits the new CEL-400 can do it quickly and easily. Advanced digital signal processing technology enable the meters in the range to cover the whole audible sound range in a single span. This eliminates the need to select the best range for a measurement since everything is covered from the quietest quiet to the loudest loud.
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Casella 450 Overview
The CEL-450 is a new concept in sound level meters offering the power of digital signal processing (DSP) technology in a small lightweight unit. The instrument provides all the features of a broadband meter while simultaneously offering the ability to measure noise levels in whole or third octave bands across a wide range of frequencies that cover the whole audible range. There are 6 models in the family covering the requirements of ANSI standards in the type 1 and type 2 categories. Datalogging is provided as standard and download and control software completes the popular kits.
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Applications
- Simple noise surveys
- Industrial hygiene measurements for OSHA compliance
- Machinery measurements
- Product noise reduction
- Transient event analysis
- Reverberation time decays
- Transmission loss
- Barrier investigations
- Selection of correct hearing protection devices
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Key benefits
- Single 140dB ultra-wide dynamic range
- Real time measurements in octaves from 16 Hz to 16 kHz
- Real time measurements in third octaves from 12.5 Hz to 20 kHz
- Simultaneous measurements of A, C and Z (linear) levels
- Max, min, average, peak measurements
- Q = 3, 4, 5 or 6 exchange rates available
- Data logging intervals as fast as every 10 msec per spectrum
- 999 separate runs
- Over 800,000 data points
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Applications
The major benefit of the CEL-450 is the ease with which it can make full range noise selecting the right range in difficult situations such as those noise parameters encountered with transient sources. These can include impacts, pass-by testing of vehicles, flyover tests for aircraft, shooting ranges and other similar noise difficult to measure sources. The ultra wide dynamic range of 140 dB means that it not necessary to worry about selecting the right range as the meter is always on the right range. Noise parameters such as the max, min, average, peak etc. can be enabled or disabled depending upon the exact requirements of the task in hand. Data log the results from 10 msec to 30 minutes to collect history of the level changes. |
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Operation and Use
The new CEL-450 could not be any easier to use. It allows the user to configure the measurements according to the most used settings and will remember them in a non-volatile memory ready for the next time. Simply choose the appropriate frequency and time weightings and data logging interval and save them in one of four User Setup stores. A factory default Setup comes as standard with the most often used settings already saved. Calibrate the input using an acoustic device and the meter is ready to go. Up to 999 separate measurements can be stored and recalled or downloaded to the included dB23 software. 11 full octaves or 33 third octave spectra can be captured in real time ensuring that none of the signal is missed compared to sound level meters with switching filters. |
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Casella 450 Products Information |
| Broadband measured parameters |
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Instantaneous level Lxy, maximum level Lxymx, minimum level Lxymn, average level Lxeq, exposure level LxE, peak level Lxpk, average level Lavg, TWA, LAeq-LCeq, LEP,D, takmaximal levels Ltm3 & Ltm5 |
Octave and third octave band
measured parameters |
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Instantaneous level Lxy, maximum level Lxymx, minimum level Lxymn, average level Lxeq, peak level Lxpk |
| Acoustic accuracy |
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ANSI S1.4 (R1997) type 1 and type 2, IEC 61672:2002, IEC 60651 :
1994, IEC 60804 : 2000, IEC 61260 : Class 0 |
| Microphone details |
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CEL-250 precision electret capsule for type 1 models, CEL-485 combined electret microphone and preamplifier for type 2 models |
| Broadband frequency weightings |
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‘A’, ‘C’ and ‘Z’ (linear, un-weighted, all-pass level) |
| Frequency response (Hz) |
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6.3 Hz to 30 kHz for -3 dB down points |
| Octave band center frequencies |
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11 simultaneous bands with center frequencies 16 Hz to 16 kHz |
| Third octave band frequencies |
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33 simultaneous bands with center frequencies 12.5 Hz to 20 kHz |
| Time weightings (response) |
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Slow, Fast and Impulse for rms. |
| Peak frequency weighting |
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‘A’, ‘C’ or ‘Z’ separate from rms. weighting |
| Dynamic range for calculations |
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140 dB |
| Noise floor (dB) |
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16.5 ‘A’ weighted, 19.7 ‘C’ weighted, 23.4 ‘Z’ weighted |
| Maximum noise level (dB) |
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140 dB rms., 143 dB peak (with standard 50 mV/Pa CEL-250 mic) |
| Resolution (dB) |
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0.1 dB across whole range |
| DSP sampling rate (Hz) |
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67,200 Hz sampling with true rms. values calculated digitally |
| Histogram classwidth (dB) |
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143 x cells at 1 dB steps for full 140 dB range plus over-range and under-range cells (selectable for broadband measurements) |
| Memory storage capability |
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2 Mbytes (over 800,000 data points) 25,000 full octave spectra |
Sampling intervals, up to 4 time
history profiles (user selected) |
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18 times from 10, 20, 50, 100, 250, 500 msec 1, 5, 10, 15, 20, 30 sec
1, 5, 10, 15, 20, 30 min |
| Fixed duration for measurement |
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12 durations from 1, 5, 10, 15, 20, 30 min 1, 2, 4, 8, 12, 24 hour |
| Calibration method |
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Manual or automatic set to user entered dB level, last 4 calibration details saved for review and verification of stability |
| Configurations saved in memory |
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1 factory default plus 4 user setups saved per bandwidth |
| Analog outputs |
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AC signal 0.5 V rms. at 94 or 114 dB FSD
(plus optional log DC output 0 to 2 V for 0 to 140 dB at 14.28 mV/dB) |
| Digital output |
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Download of stored data to pc or remote control of operations of meter via dB23 software |
| Baud rate for digital transfer |
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8 settings from 9600 to 115200 baud |
| Screen languages |
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English, French, German, Italian, Spanish menu selectable |
| LCD screen display |
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128 x 64 pixel monochrome backlit display with icon indicators |
| Size |
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13.4 x 4 x 1.5 in (340 x 100 x 40 mm) |
| Weight |
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19.3 oz (550 gm) |
| Tripod socket |
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Standard camera thread (1/4 inch) |
| Internal power supply |
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4 off AA alkaline cells (15 hours typical max battery life for broadband, 12 hours typical for narrow band measurements) |
| External power supply |
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12 V dc at 150 mA nominal via 2.1 mm power connector |
Models available |
| Broadband model |
| Octave band model |
| Third octave band model |
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ANSI Type 1 accuracy |
ANSI Type 2 accuracy |
CEL-450.A1 |
CEL-450.A2 |
CEL-450.B1 |
CEL-450.B2 |
CEL-450.C1 |
CEL-450.C2 |
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| Measurement Kits |
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Specify a standard kit by adding /K1 after meter part number to include relevant acoustic calibrator, foam windscreen, pc cable, software and attaché carrying case. |
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Casella 490 Overview
The CEL-490 is the ultimate instrument for long term community noise measurements where wide changes in levels are expected to occur. Previous generations of noise meters require the user to make a decision on the likely noise levels to be expected during the measurement. Select too high a range and the low background levels will be missed. Choose to low a range and the important peak levels will cause overloads and consequent errors. The single 140 dB range available in the CEL-490 enable worry free measurements over the whole audio range without changing range. A wide range and all the frequency information collected simultaneously with the power of DSP filters. |
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Applications
- Long term noise surveys
- Reverberation time measurements
- All types of general noise measurements
- Frequency analysis of transient noise impulses
- Workplace noise surveys
- Transportation noise studies
- ANSI/IEC type 1 & 2 models
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Key benefits
- Single ultra wide 140 dB dynamic range
- A, C & Z plus whole octave or third octaves depending on model variant
- Full data logging as standard
- Over 800,000 data point nonvolatile memory
- Cumulative results for the whole of the run
- Regular periodic results at user specified intervals
- Time history profiles for built-in graphic level recording
- Storage intervals up to 100 spectra per second for rapid data capture of transients
- Slow, Fast & Impulse rms. responses plus Peak
- Simple menu operation using keypad and icon controls
- Menus in English, French, German, Italian and Spanish
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Applications
The CEL-490 comes into its own for difficult noise applications when rapid data recording is required. Spectral data capture as fast as 10 millisec per octave or third octave band spectrum ensures that even the most difficult transient sounds will be measured correctly with no loss of acoustic data integrity. Remote control of the full operation of the meter from a pc using the included dB23 software enables stored runs to be quickly downloaded and the start and stop of new measurements to be made with a few mouse clicks. Connection can be direct by the included pc cable or by regular and GSM modems. |
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Operations and Use
Every CEL-490 comes with a factory default measurement setup pre-configured for ready to go measurements. Additionally, up to 4 user-defined setups can be stored for specific measurement needs with a few or as many parameters chosen from the extensive list in order to customize the way a measurement is captured.
Community noise surveys can cover a total of 24 hours for a single run with hourly period results plus 1 minute profile data saved to show more detail. Up to 999 separate runs can be stored with up to 99,999 periods per run. Four key parameters can be saved as short time history profiles for traditional graphic level recorder operation.
Simple noise surveys can be captured with the overall ‘A’, ‘C’ and ‘Z’ weighted level plus all 33 third octave bands for continuous or impulsive noise sources making this an ideal instrument the professional acoustics engineer. Statistical noise parameters such as the Ln10% and Ln90% levels are measured in broadband and third octaves.
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Casella 490 Product Information |
Broadband measured
parameters |
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Instantaneous level Lxy, maximum level Lxymx, minimum level Lxymn, average level Lxeq, exposure level LxE, peak level Lxpk, average level Lavg, TWA, LAeq-LCeq, LEP,D, takmaximal levels Ltm3 & Ltm5, 5 user selectable LN% values |
Octave and third octave band
measured parameters |
|
Instantaneous level Lxy, maximum level Lxymx, minimum level Lxymn, average level Lxeq, peak level Lxpk, 5 user selectable LN% values |
| Acoustic accuracy |
|
ANSI S1.4 (R1997) type 1 and type 2, IEC 61672:2002, IEC 60651 :
1994, IEC 60804 : 2000, IEC 61260 : Class 0 |
| Microphone details |
|
CEL-250 precision electret capsule for type 1 models, CEL-485 combined electret microphone and preamplifier for type 2 models |
| Broadband frequency weightings |
|
'A', 'C' and 'Z' (linear, un-weighted, all-pass level) |
| Frequency response (Hz) |
|
6.3 Hz to 30 kHz for -3 dB down points |
| Octave band center frequencies |
|
11 simultaneous bands with center frequencies 16 Hz to 16 kHz |
| Third octave band frequencies |
|
33 simultaneous bands with center frequencies 12.5 Hz to 20 kHz |
Time weightings (response)
|
|
Slow, Fast and Impulse for rms. |
| Peak frequency weighting |
|
'A', 'C' or 'Z' separate from rms. weighting |
| Dynamic range for calculations |
|
140 dB |
| Noise floor (dB) |
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16.5 'A' weighted, 19.7 'C' weighted, 23.4 'Z' weighted |
| Maximum noise level (dB) |
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140 dB rms., 143 dB peak (with standard 50 mV/Pa CEL-250 mic) |
| Resolution (dB) |
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0.1 dB across whole range |
| DSP sampling rate (Hz) |
|
67,200 Hz sampling with true rms. values calculated digitally |
| Histogram classwidth (dB) |
|
143 x cells at 1 dB steps for full 140 dB range plus over-range and under-range cells (user selectable for broadband measurements) |
| Memory storage capability |
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2 Mbytes (over 800,000 data points) 25,000 full octave spectra |
Sampling intervals, in periods up
to 14 parameters (user selected) |
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19 times from 10, 20, 50, 100, 250, 500 msec 1, 5, 10, 15, 20, 30 sec
1, 5, 10, 15, 20, 30, 60 min |
Sampling intervals, up to 4 time
history profiles (user selected) |
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18 times from 10, 20, 50, 100, 250, 500 msec 1, 5, 10, 15, 20, 30 sec
1, 5, 10, 15, 20, 30 min (profile interval time must be ± period times) |
| Fixed duration for measurement |
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12 durations from 1, 5, 10, 15, 20, 30 min 1, 2, 4, 8, 12, 24 hour |
| Delayed start and stop for runs |
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Up to 7 pairs of delayed timers can be set up to 30 days in advance |
| Calibration method |
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Manual or automatic set to user entered dB level, last 4 calibration details saved for review and verification of stability |
| Configurations saved in memory |
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1 factory default plus 4 user setups saved per bandwidth |
| Analog outputs |
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AC signal 0.5 V rms. at 94 or 114 dB FSD
(plus optional log DC output 0 to 2 V for 0 to 140 dB at 14.28 mV/dB) |
| Digital output |
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Download or remote control of operations of meter via dB23 software |
| Baud rate for digital transfer |
|
8 settings from 9600 to 115200 baud |
| Screen languages |
|
English, French, German, Italian, Spanish menu selectable |
| LCD screen display |
|
128 x 64 pixel monochrome backlit display with icon indicators |
| Size |
|
13.4 x 4 x 1.5 in (340 x 100 x 40 mm) |
| Weight |
|
19.3 oz (550 gm) |
| Tripod socket |
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Standard camera thread (1/4 inch) |
| Internal power supply |
|
4 off AA alkaline cells (15 hours typical max battery life for broadband, 12 hours typical for narrow band measurements) |
| External power supply |
|
12 V dc at 150 mA nominal via 2.1 mm power connector |
Models available |
| Broadband model |
| Octave band model |
| Third octave band model |
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ANSI Type 1 accuracy |
ANSI Type 2 accuracy |
CEL-490.A1 |
CEL-490.A2 |
CEL-490.B1 |
CEL-490.B2 |
CEL-490.C1 |
CEL-490.C2 |
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Measurement Kits |
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Specify a standard CEL-490 kit by adding /K1 after meter part # |
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