Casella CEL CEL-278 - Manual (Page 27)

6. SPECIFICATION
Filter bands:
11 Octave filter bands according to IEC 225
and ANSI S1.11-1966 (R1975) Class II,
C-weighted network according to Type 1 of the relevant portions of
IEC 651 and ANSI S1.4-1983.
Dynamic range:
70dB, with 30dB shift between Hi and Lo ranges.
Nominal octave band centre frequencies:
16Hz 31.5Hz 63Hz 125Hz 250Hz 500Hz
1kHz 2kHz 4kHz 8kHz 16kHz.
Attenuation at centre frequency:
0 ±0.5dB.
Pass band ripple:
< 0.5dB.
All pass frequency range: (within •t-1 to -3dB)
6Hz to 25kHz.
All pass signal to noise ratio:
Band Lo range Hi range
All
pass >70dB >80dB
Octaves > 70dB > 70dB
C-weighted >70db >80dB
CEL Instruments Ltd. CEL-278/2 Handbook Page 27