Casella CEL CEL-63X - Manual (Page 60)

CEL-63x Environmental & Occupational Noise Meter
60 Casella CEL
6.3 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.
When used with the high range microphones (-MIC1) the maximum RMS
ranges is up to 165.0 dB(A).
6.4 RMS frequency weightings
A, C and Z filter weightings satisfying IEC 61672-1: 2002 Class 1.
6.5 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.
6.6 Peak measurement
A-, C- or Z-weighted from 65.0 dB to 143.3 dB.
6.7 RMS detector
Digitally-derived true root-mean-square (RMS) detection, 0.1 dB display
resolution.
6.8 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).
6.9 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