B&K 2250 Light Manual de usuario descargar pdf (Pagina 48)

Hand-held Analyzer 2250 Light – User Manual

Manual Calibration

If no calibrator is available (or a known amplification is introduced, e.g., by analysing a tape

recorded signal) then you can type the sensitivity directly into the Sensitivity field. The

analyzer will be regarded as uncalibrated and the text ‘Uncal.’ will appear in the status field.

Charge Injection Calibration

You can check the complete measurement chain during long term measurement using Charge

Injection Calibration. See section 5.7.

5.3 Standard Calibration

To perform the acoustic calibration use Sound Calibrator Type 4231. It provides a stable sound

pressure at 1 kHz and has minimal susceptibility to environmental factors. The procedure itself is

relatively simple, and on the analyzer the procedure is referred to as the Standard Calibration

procedure.

The procedure for performing an acoustic calibration and instructions on how to fit the

calibrator are given below:

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

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B&K 2250 Light Manual de usuario Pagina 48