Calibration, N, refer to, For details – Casella CEL CEL24X User Manual
Page 8
4. A Bargraph (Refer to Figure 4
[A]) or Time History (Refer to Figure 4 [B]) will be
displayed. Refer to
to change the Time and
Frequency Weightings, or to change the type of display.
CEL-240/242
CEL-244/246
Figure 4 CEL-200 Series Bargraph and Time History Screens
5. The screen will display the instantaneous and maximum sound pressure levels
along with the relevant Time and Frequency Weighting. Refer to
to change these settings. Additionally, CEL-244 and CEL-246
instruments will display the average level (Leq or Lavg) since the reset button
was pressed. To reset the maximum sound pressure level and average level,
press and release the
key.
6. When the required measurements have been taken, press and hold the Power
ON/OFF key (Refer to
) for three seconds to switch the instrument
OFF.
Note:
The ‘press and hold for three seconds’ feature prevents the CEL-200 Series
being accidentally switched OFF during use.
5.
CALIBRATION
It is recommended that an acoustic calibration using a CEL-110/2 (or CEL-110/1)
calibrator be performed before and after taking measurements.
PROCEDURE
1. Switch ON the Acoustic Calibrator (Refer to the Calibrator Instruction Manual).
2. Check the Acoustic Calibrator has a 114dB (or 94dB) output.
3. Make sure the instrument is set to the 60-130dB range.
4. Fit the Acoustic Calibrator firmly over the microphone. The instrument
automatically detects a 1kHz tone from a 94 or 114dB Calibrator and enters
Calibration Mode (Refer to Figure 5).
8