Casella-cel CEL-228 Manual do Utilizador Página 6
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Casella USA
17 Old Nashua Road #15
Amherst, NH 03031-2839
www.casellausa.com
Page 6 of 6 tel: (800) 366-2966
23 Dec 2005 fax: (603) 672-8053
Specification
Accuracy
Sound level meter: IEC 651, BS 5969 and ANSI
S1.4 in the type 2 category. DIN 45 634
Filters: IEC 225, BS2475, ANSI S. 11 class 11
Ranges
30 - 70 dB, 60 - 100 dB and 90 - l30 dB
Measuring Limits
Self-noise less than 25dB(A) or less than
40dB(Flat). 135dB absolute maximum.
Microphone
17 mm (0.67 inch) electret condenser type
Frequency Response
dB(A), Flat or 8 octave bands 63 Hz - 8kHz.
Plus 31.5Hz low band and 16kHz high band.
Display
47 mm (1.9 inch) meter movement covering 40
dB dynamic range.
Time Weightings
Fast, Slow and Impulse as per standards.
Maximum Hold
Analogue hold of maximum RMS level with a
decay rate of less than 1 dB/5 min at 20ºC.
Calibration
Field calibration checks by means of CEL-184 or
CEL-182 Acoustic Calibrators (NB coupler type
CEL-3379 necessary for X version).
Auxiliary Output
3.5 mm jack feed of conditioned AC output at
1.0V for FSD via 3k3 Ohms.
Batteries
3 x 6 F22 (or equivalent) - 2 for sound level
meter and one for calibrator.
Temperature Range
-10 to +50ºC operational. -15 to +60ºC storage.
Humidity Range
30% to 90% for ±0.5 dB
Electromagnetic Interference
<MSD for 400 A/M
Vibration Interference
<62d B (Flat) for 1 m/sec/sec
Dimensions
235mm x 75mm x 54mm (9.2in x 3in x 2.1in)
Weight
425g (15oz)
REFERENCE CONDITIONS FOR
CALIBRATION
Type of sound field
Free
Reference incidence direction
Microphone diaphragm
Reference pressure level
94 dB relative to 0.00002 Pa
Reference frequency
1 kHz
Reference measurement range
60-100
Reference temperature
20'C
Date ........................
Calibration Certificate
CEL-228 serial number ...................... .... ... .
CEL-184 serial number ……………………….
Date …………………………………………….
CEL Instruments are manufactured and serviced
by:
Casella CEL Inc.
17 Old Nashuia Road #15,
Amherst, NH 03031 USA
PHONE (800) 366-2966
FAX (603) 672-8053
In line with our policy of continual design
improvement we reserve the right to amend any
of the details in this handbook.
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