CEL-63x Environmental & Occupational Noise Meter
42
Casella CEL
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
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
1420
2000
2840
1413
1778
2239
1600
2000
2500
1778
2239
2818
2840
4000
5680
2818
3548
4467
3150
4000
5000
3548
4467
5623
5680
8000
11360
5623
7079
8913
6300
8000
10000
7079
8913
11220
11360
16000
22720
11220
14130
17780
12220
16000
20000
14130
17780
22390
