B&K 2250 Light Bedienungsanleitung PDF herunterladen (Seite 64)

Hand-held Analyzer Types 2250 and 2270 – User Manual

5.3.1 Standard Calibration

1) Stand away from loud sound sources that may interfere with the calibrator’s signal.

2) Switch on the analyzer: push .

3) Tap the Main Menu icon then Calibration to open the Calibration screen (Fig.5.1).

Fig.5.1

Calibration screen

This screen contains a bar graph showing the actual sound pressure level and three

placeholders for displaying information about the last calibration.

4) Following the first part of the instruction in the Status Field, fit Sound Calibrator

Type 4231 carefully onto the microphone of the analyzer. (To avoid handling vibrations

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. Press Yes to

accept and use the new sensitivity and save it in the calibration history. Press 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 (microphones only),

then the calibration is stopped without changing the calibration of the analyzer. The traffic

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B&K 2250 Light Bedienungsanleitung Seite 64