CASELLA CEL CEL-490 Manual do Utilizador descarregar pdf (Página 55)

CEL-63x Environmental Noise Meter

55 Casella CEL

5.3 Measurement range

Single measurement range up to 140.2 dB(A) RMS and 143.3 dB(C) peak.

Linearity range from 10 dB above noise floor.

5.4 RMS frequency weightings

A, C and Z filter weightings satisfying IEC 61672-1: 2002 Class 1.

5.5 Octave and 1/3-Octave measurement

Octave: Real-time 11 bands with centre frequencies from 16 Hz to 16 kHz.

1/3-Octave: Real-time 33 bands with centre frequencies from 12.5 Hz to

20 kHz.

The displayed spectrum can be pre-weighted with A, C or Z.

Z-weighted octaves are stored only to be post-weighted in Insight software.

5.6 Peak measurement

A-, C- or Z-weighted from 65.0 dB to 143.3 dB.

5.7 RMS detector

Digitally-derived true root-mean-square (RMS) detection, 0.1 dB display

resolution.

5.8 Noise floor

Total inherent noise including microphone thermal noise at 20 °C:

<20 dB (A) Class 1

<24 dB (A) Class 2

Electrical noise floor <17.5 dB (A).

5.9 Frequency response

6 Hz to 20 kHz (lower and upper 3 dB frequencies).

Digital sampling rate 67.2 kHz.

Overall Class 1 and Class 2 frequency response compliant with

IEC 61672-1: 2002

5.10 Time weightings

Fast (F), Slow (S) and Impulse (I) according to IEC 61672-1: 2002.

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CASELLA CEL CEL-490 Manual do Utilizador Página 55