CASELLA CEL CEL-450 Handbook page 40

Acoustic Calibration Check
Operation Press Display Shows
5. When the
calibration
is
successful
6. Change
or
the
Automatic
calibration
level
Table 1: Calibration Levels
Accuracy Microphone Directional
Class Response of
Microphone
Class 1 CEL-250 Free Field (IEC)
Instruments
Random Incidence (ANSI)
Class 2 CEL-485 Free Field (IEC)
Instruments
Random Incidence (ANSI)
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
Comments
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.
Highlight the Auto
calibration level.
2
Acoustic Calibration
3
Calibrator Level
CEL-110/1 114.0 dB
CEL-284/2 114.0 dB
CEL-110/1 113.8 dB
CEL-284/2 113.8 dB
CEL-110/1 113.6 dB
CEL-110/2
CEL-282
CEL-284/2
CEL-110/1 113.6 dB
CEL-110/2
CEL-282
CEL-284/2