Casella CEL CEL-440 - Manual (Page 58)

Filters:
Octave Filter:
Order 6, Type 3-D, optional range per ANSI S1.11 1986,
Class 2 to IEC 1260: 1995,
9 bands with centres from 31.5 Hz to 8 kHz (B and C models).
Third-octave Filter:
Order 6, Type 3-D, optional range per ANSI S1.11 1986,
Class 2 to IEC 1260: 1995,
28 bands with centres from 25 Hz to 12.5 kHz (C models).
Calibration:
Direct for Type 1 microphone (CEL-250).
Direct for Type 2 microphone/preamplifier unit (CEL-485).
Calibration Reference Conditions:
60 - 130 dB measurement range,
20
o
C air temperature,
65% Relative Humidity,
101.325 kPa atmospheric pressure.
114.0 dB at 1 kHz Nominal reference level.
Reference direction of incidence for all microphones is perpen-
dicular to the front face (diaphragm surface) of the microphone.
No cable correction is required for microphone cables up to 10 m
when calibration is performed with the C6716 or C6717 Cables
fitted.
Alternative Calibration:
Suitable for direct line input from tape recorder with direct
scaling to suit recorded range.
Calendar & Clock:
Date and time accuracy better than 5 sec per day.
Data Storage:
Cumulative data set of overall values for all runs.
Broad Band Data Storage:
Manual storage of 999 complete sets of results.
Page 58 - CEL-440/480 Operators Handbook
Specification