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Casella 490.B2 Octave Band Sound Level Meter Kit
Item #: Q412-0490
Manufacturer: Casella
Manufacturer Item #: CEL-490.B2/K1
Product Type: Octave Band Sound Level
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Casella 490.B2 Octave Band Sound Meter identifies whether the noise level could have a detrimental effect
Features & Applications:
The Casella 490.B2 Octave Band Sound Level Meter Kit 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.
The Casella 490.B2 Octave Band Sound Level Meter Kit 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.
Kit Includes:
- Real time octave band ANSI type 2 meter
- CEL-110/2 acoustic calibrator
- CEL-4672 foam windscreen
- CEL-6722 attache style kit case
- C6724 pc download cable
- CEL-6813 dB23 pc software
- 4 x AA batteries for meter, 1 x 9V battery for calibrator and operator manuals
Features:
- 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
- Includes Certificate of Conformance
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
Spec Summary:
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 2, IEC 61672:2002, IEC 60651 :
1994, IEC 60804 : 2000, IEC 61260 : Class 0 |
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): |
16.5 'A' weighted, 19.7 'C' weighted, 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
under-range cells (user selectable for broadband measurements) |
Memory storage capability: |
2 Mbytes (over 800,000 data points) 25,000 full octave spectra |
Sampling intervals, in periods up
to 14 parameters (user selected): |
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): |
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 ¡Ü period times) |
Fixed duration for measurement: |
12 durations from 1, 5, 10, 15, 20, 30 min 1, 2, 4, 8, 12, 24 hour |
Delayed start and stop for runs: |
Up to 7 pairs of delayed timers can be set up to 30 days in advance |
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 default plus 4 user setups saved per bandwidth |
Analog outputs: |
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: |
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: |
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 |
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