Casella CEL CEL-450 - Manual (Page 40)

Operation Press Display Shows Comments
5. When the
calibration
is
successful
The user is given the option
of saving or not saving the
new calibration.
Press again to use the
highlighted option and save
the calibration.
Or use or to
highlight NO SAVE to ignore
the current calibration and
use the previous calibration.
6. Change
the
Automatic
calibration
level
or
Highlight the Auto
calibration level.
Table 1: Calibration Levels 2
Accuracy Microphone
Class
Directional
Response of
Microphone
Acoustic
Calibrator
Calibration
Level 3
Class 1
Instruments
CEL-250 Free Field (IEC) CEL-110/1 114.0 dB
CEL-284/2 114.0 dB
Random Incidence (ANSI) CEL-110/1 113.8 dB
CEL-284/2 113.8 dB
Class 2
Instruments
CEL-485 Free Field (IEC) CEL-110/1
CEL-110/2
CEL-282
CEL-284/2
113.6 dB
Random Incidence (ANSI) CEL-110/1
CEL-110/2
CEL-282
CEL-284/2
113.6 dB
Note 2: These levels may also be subject to further correction as follows:
(a)When a traceable calibration certificate is available for the acoustic calibrator
and/or the sound level meter.
(b)To compensate for atmospheric conditions as described in the calibrator
instructions.
Note 3: The instrument can be set to Autocalibrate to these levels.
Page 40 - CEL-450/490 Operators Handbook
Acoustic Calibration Check