CEL240 Class 2 Sound Level Meter

CEL240 Class 2 CEL246 Class 2 Integrating

2. Calibration Check Some regulations and guidelines state that the meter's calibration should be checked before making measurements, and that you should keep records of these calibration checks. Fit the Calibrator over the microphone as shown on the right and switch it on. The meter automatically detects the presence and correct fitting of the Calibrator and then starts the calibration process, which only takes a few seconds.

Calibration Check

3. Changing Settings

As the meter saves its settings, you should only need to do this occasionally. The left-hand button cycles through the following main settings:

	Display Type	Graph or numbers
	Measurement Range	30 to 100 dB or 60 to 130 dB
	Time Weighting	Fast, Slow or Impulse
	Frequency Weighting	"A" or "C" weighting

The right-hand button is used to change the current setting of any of these parameters.

 

4. Make the Measurements

You can now read the sound level from the display.

In the example on the right, the meter is set to read the Fast Sound Level (LAF). The current level is 53 dB(A) and the maximum (since last reset) is 80.9 dB(A).

Press the reset button (right-hand button) to reset the max reading.