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Calibration, N, refer to, For details – Casella CEL CEL24X User Manual

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4. A Bargraph (Refer to Figure 4

[A]) or Time History (Refer to Figure 4 [B]) will be

displayed. Refer to

INSTRUMENT SETTINGS

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

Instrument

Settings

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

Switch Off

) 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.

Back to

Index

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).

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