B&K 2250 Light Manuel d'utilisateur télécharger pdf (Page 49)

CHAPTER 5

Calibration

that disturb the calibration, rest the assembly in a roughly horizontal position on a table or

other flat surface.)

Ensure that the calibrator fits snugly on the microphone.

5) Switch on the calibrator. Wait a few seconds the level to stabilise.

6) Tap the button on the screen to start the calibration.

Note: Detecting level... appears on the screen as feedback.

7) While the analyzer is searching for the calibration signal and the signal level is stabilising,

the ‘traffic light’ indicates a short green flash every second. When the level is stable, the

traffic light indicates a steady green and the signal is measured and used for calibration. Once

the calibration has been completed successfully, the traffic light indicates a short

yellow flash every 5 seconds. The Sensitivity is automatically calculated and displayed in

a pop-up together with the deviation from the last calibration. Tap Yes to accept and use the

new sensitivity and save it in the calibration history. Tap No to disregard the new

calibration and continue with the old calibration.

If the calibration deviates more than

 1.5 dB from the initial calibration, then the

calibration is stopped without changing the calibration of the instrument. The traffic light

will indicate a fast flashing red and an error description will appear in the status field.

Hint: If the microphone is separated from the analyzer using a microphone extension

cable then place the analyzer so it can be seen from the location of the microphone. Start

the calibration process, (select the Calibration screen and tap the button on

the screen, then go to the microphone and fit the Calibrator onto the microphone, switch

on the calibrator and monitor the traffic light on the analyzer, as discussed previously.

8) Once you have completed the calibration, tap the button and remove the

calibrator. It will automatically switch off after a few seconds.

5.3.1 Calibration Settings

Select the Details tab on the Calibration screen to view the calibration details, see Fig.5.2.

Fig.5.2

Calibration details

screen

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B&K 2250 Light Manuel d'utilisateur Page 49