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CEL-450 Real Time Octave & Third Octave Band Analyzer from Casella USA
The CEL-450 has been discontinued. Please contact AFC International for suitable replacements. The CEL-450 Octave Band Analyzer 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.
Operation & Use
The CEL-450 could not be any easier to use. It allows the operator to configure the measurements according to the most used settings and it will remember them in a non volatile memory ready for the next time. Simply choose the appropriate frequency and time weightings and datalogging interval and save them in out 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.
The major benefits of the CEL-450 is the ease with which it can make full range noise measurements in difficult situations such as those encountered with transient sources. These can include impacts, pass-by testing of vehicles, fly over tests for aircraft, shooting ranges and other similar difficult to measure noise sources. The ultra wide dynamic range of 140 dB means that it is 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 time history of the level changes.
Applications
- Simple noise surveys
- Industrial hygiene
- Measurements for OSHA compliance
- Machinery measurements
- Product noise reduction
- Transient event analysis
- Transmission loss
- Barrier investigations
- Selection of correct hearing protection devices
Benefits
- Single 140 dB ultra wide dynamic range
- Real time measurements in octaves from 16 Hz to 16 kHz
- Real time measurements in third octaves from 12.5Hz 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
- Datalogging intervals as fast as every 10 msec per spectrum
- 999 separate runs
- Over 800,000 data points
Specifications
| Broadband Measured Parameters |
Instantaneous level, Lxy, maximum level Lxymx, minimum level Lxymn, peak level Lxpk, average level (Q=3) Lxeq, average level (Q=4) Lavg, average level (Q=5) Lavg, takmaximal levels Ltm3 & Ltm6, exposure level LxE, LCeq-LAeq, LEPD |
| Octave and Third Octave Band Measured Parameters |
Instantaneous level Lxy, maximum level Lxymx, minimum level, Lxymn, average level Lxeq, peak level Lxpk |
| Acoustic Accuracy |
ANSI S1.4 (R1997) type 1 & 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 and Fast for rms |
| Peak Frequency Weighting |
'A', 'C' or 'Z' separate from rms weighting |
| Dynamic Range for Display |
140 dB |
| Noise Floor (dB) |
16.5 'A' weighted, 19.7 'C', 23.4 'Z' weighted |
| Maximum Noise Level (dB) |
140 dB rms, 143 dB peak (with standard 50 mV/Pa cel-250 mic) |
| Resolution (dB) |
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 user range cells (user selectable for broadband measurements) |
| Memory Storage Capability |
2 Mbytes (over 800,00 data points) 25,000 full octave spectra |
| Sampling Intervals, Up to 4 Broadband Time History Profiles (User selected) |
18 times from 10, 20, 50, 100, 250, 500 msec, 1, 5, 10, 15, 20, 30 sec, 1, 5, 10, 15, 20, 30 min |
| Duration for Measurement |
12 durations from 1, 5, 10, 15, 20, 30 min, 1, 2, 4, 8, 12, 24 hour |
| Calibration Method |
Manual or automatic set to user entered dB level, last 4 calibration details saved for review and verification of stability |
| Configurations Saved in Memory |
1 factory defaults plus 4 user configured setups per bandwidth |
| Analog Outputs |
AC signal 0.5 V rms at 94 dB with 114 dB FSD (plus optional log DC output 0 to 2 V for 0 to 140 dB at 14.28 mV/dB) |
| Digital Output |
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 for Display |
English, French, German, Italian, Spanish menu selectable |
| LCD Screen Display |
128 x 64 pixel monochrome backlit display with icon indicators |
| Battery |
4 AA alkaline cells, 15 hours typical life or 12 VDC at 150 mA nominal via 2.1 mm power connector |
| Dimensions |
13.4" x 4" x 1.5" |
| Weight |
19.3 ounces |
Ordering Information
For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com.
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