Casella CEL CEL-272 User Manual
Page 6
Type:
Personal Sound Exposure Meter according to
IEC Draft Document TC 29/WG 4, IEC 29
(SEC) 194 Feb 1990.
Meets measurement requirements of ISO 1999:
1990 Determination of Occupational Noise
Induced Hearing Impairment.
Sound level range:
70 - 140 dB(A) at 1kHz.
Sound exposure range:
0.001 - 19999 Pa
2
h.
Noise dose range:
0.1 - 19999% Dose.
Reference frequency:
1 kHz.
Reference direction:
Perpendicular to microphone diaphragm.
Reference SPL:
114.0 dB.
Frequency characteristics:
A-weighting according to IEC 651 type 2
between 20 Hz and 12.5 kHz.
Response to unipolar pulses:
Typical error <
±
12% of the reading.
Effect of temperature on accuracy:
Errors are less than -11 and +12% over the
range 0 to +40
o
C.
Storage temperature range: -10 to +50
o
C.
Effect of atmospheric pressure:
Errors are less than -11 and +12% over the
range 101.3 kPa
±
10% (1013 mbar,
760 mmHg).
Effect of magnetic fields on accuracy:
A field of 80 Am
-1
for 1 h has no measurable
effect.
Effect of humidity on accuracy:
Errors are less than -11 and +12% over the
range 30 to 90% RH provided there is no
condensation, relative to the value at 65% RH
and 40
o
C.
Storage humidity range: 0 to 95%RH.
Effect of vibration on accuracy:
Less than 0.001 Pa
2
h per hour of testing for
both instrument and microphone when tested
according to IEC 651 clause 8.3.
Stabilisation time:
20 s.
Microphone type:
CEL
1
/
4
" electret,
Installed in 9.5 mm energy absorbing mounting
on 0.84 m cable.
Typical sensitivity: 10 mV/Pa.
Digital display:
4
1
/
2
digits.
Display indication:
Pa
2
h,
% Dose,
Overload (
::
)
Calibration mode (flashing decimal points),
Low battery (below 4 V),
Overflow (2000 flashing).
Noise dose criterion:
100% = 90 dB(A) for 8 hours.
Amplitude weighting:
q = 3.
The Manufacturers reserve the right to change instrument specifications without prior notice. Until Draft
Document TC 29/WG 4 is published as an IEC Standard with a definite specification, please consult Lucas
CEL for any further details about the CEL-272.
Specification - Compliance with IEC Draft TC 29/WG 4
6 Black
Register
Marks
6 CEL Blue