
CEL-63x Environmental Noise Meter
38 Casella CEL
Calibration reference level setup
The calibration reference level screen allows you to set the
CEL-63x instrument to use the same sound pressure level as the
calibrator.
Documents supplied with the calibrator should tell you what
sound pressure level it delivers at the 1 kHz reference tone. This
will be in the range 93 dB to 95 dB, or in the range 113 dB to 115 dB.
This screen allows you to set the instrument to the same calibration level, to an
accuracy ±0.1 dB.
Meter Mode
The Meter Mode option allows you to set whether the CEL-63x
instrument displays measurements octave or ⅓-octave frequency
bands.
Table 2 below lists the octave and ⅓-octave centre frequencies,
and the upper and lower frequencies of each band.
Table 2. Octave band frequencies
Lower
cutoff
frequency
(Hz)
Upper
cutoff
frequency
(Hz)
Lower
cutoff
frequency
(Hz)
Upper
cutoff
frequency
(Hz)
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