Features & Applications:
The Casella 450.B2 Sound Level Meter Kit offers 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.
The major benefit of the Sound Level Meter Kit 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, 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 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 history of the level changes.
Kit Includes:
- CEL-450.B2 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 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 sample
- 999 separate runs
- Over 800,000 data points
- Operating Temp: 12 to 122º F (-10º C to 50º C)
- Storage Temp: 0 to 140º F
- 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
Note: Batteries last 15 hours without filter and 12 hours with filter.
Spec Summary:
|
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 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 (selectable for broadband measurements) |
|
Memory storage capability: |
2 Mbytes (over 800,000 data points) 25,000
full octave spectra, |
|
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 |
| Fixed 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 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 of stored data to
pc 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 |
|
External power supply: |
12 V dc at 150 mA nominal via 2.1 mm power
connector |
