CASELLA CEL CEL-490 Instrukcja Użytkownika Strona 38

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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 -octave frequency
bands.
Table 2 below lists the octave and -octave centre frequencies,
and the upper and lower frequencies of each band.
Table 2. Octave band frequencies
Octave
1/3-Octave
Lower
cutoff
frequency
(Hz)
Centre
frequency
(Hz)
Upper
cutoff
frequency
(Hz)
Lower
cutoff
frequency
(Hz)
Centre
frequency
(Hz)
Upper
cutoff
frequency
(Hz)
22
31.5
44
22.4
28.2
35.5
25
31.5
40
28.2
35.5
44.7
44
63
88
44.7
56.2
70.8
50
63
80
56.2
70.8
89.1
88
125
177
89.1
112
141
100
125
160
112
141
178
177
250
355
178
224
282
200
250
315
224
282
355
355
500
710
355
447
562
400
500
630
447
562
708
710
1000
1420
708
891
1122
800
1000
1250
891
1122
1413
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