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

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

Storage temperature range: -10 to +50

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

Storage humidity range: 0 to 95%RH.

Effect of vibration on accuracy:

Less than 0.001 Pa

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

" electret,

Installed in 9.5 mm energy absorbing mounting
on 0.84 m cable.
Typical sensitivity: 10 mV/Pa.

Digital display:

digits.

Display indication:

% 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

6 CEL Blue