Casella CEL CEL-278 - Manual (Page 28)

Typical noise floor: (measured on Lo range with a CEL-493/2 Sound Level
Meter)
Filter Set All pass: (WTNG and band position)
Linear
A-weighted
28.0dB 15.5dB(A).
Filter Set C-weighted:
Linear
21.0dB.
Octave bands:
Band
Linear A-weighted
16Hz 19.0dB < 10.2dB(A)
31.5Hz 18.0dB < 10.2dB(A)
63Hz 14.0dB < 10.2dB(A)
125Hz 11.0dB < 10.2dB(A)
250Hz 10.5dB < 10.2dB(A)
500Hz 10.0dB < 10.2dB(A)
1kHz 10.0dB < 10.2dB(A)
2kHz 10.0dB < 10.2dB(A)
4kHz 10.0dB < 10.2dB(A)
8kHz 10.0dB < 10.2dB(A)
16kHz 11.0dB < 10.2dB(A)
Max Input voltage:
Lo range Conditioned 0.25V RMS
Hi range Conditioned 8.0V RMS.
Input impedance: 10kΩ,
Recommended output impedance of input device < 1 kΩ
Page 28 CEL-278/2 Handbook CEL Instruments Ltd