Casella CEL CEL-228 User Manual
Page 3
Casella USA
17 Old Nashua Road #15
Amherst, NH 03031-2839
www.casellausa.com
Page 3 of 6
tel:
(
800) 366-2966
23 Dec 2005
fax: (603) 672-8053
Calibration
The calibration level is 90dB(A) and this should
cause a corresponding Indication on the scale.
Should the instrument have drifted due to
environmental influences it may be reset by
means of the CAL control located through the
aperture in the front panel of the instrument.
Using the screwdriver provided the level maybe
reset to the correct reading. If large changes in
the calibration level are observed, the meter
should be returned to our service department or
your local agent.
In line with current instrument practice all types
of sound level meters should be regularly
calibrated to ensure the accuracy of the reading
obtained. For this purpose the CEL-184
Acoustic Calibrator is provided. To check the
calibration of the CEL-228, the CEL-3379
coupler supplied with the kit should be placed
over the microphone ensuring that it is correctly
seated against the shoulder in the microphone
coupler. The calibrator may then be placed over
the coupler and microphone assembly, here
again ensuring that both '0' rings are passed
and the coupler and calibrator are correctly
seated. Switch on both the calibrator and the
sound level meter, the latter having its range
selector set to the 60dB(A) range.
Where the CEL-228/K2 has been supplied it
must be noted that the CEL-1 82 calibrator
produces a level of 11 6.5dB and the necessary
amendment to the procedure outlined above will
be necessary to take account of this.