B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 207)

CHAPTER 17

Low Frequency Option BZ-7234

195

10) Select Units > Engineering Unit and select No (in dB) or Yes (in m/s

Note: If you want readouts in g instead of m/s

, set the Vibration Unit to US/UK in

Preferences > Regional Settings.

11) Tap to exit Setup.

17.4.1 Controlling the Measurement

The measurement is controlled in the same way you would control a normal Sound Level

Meter measurement, using Start/Pause , Continue , Back-erase and Reset

pushbuttons, see Chapter 3 for more details.

17.4.2 Displaying the Results

Tap on the broadband result readouts to select parameters from the Low Frequency group to

select the building vibration results (Fig.17.6).

Fig.17.6

Selection of Low

Frequency building

vibration results

17.5 Setting Up the Frequency Analyzer Module for Very

Low Frequencies

1) For:

– Sound measurements: Mount your low-frequency microphone and low-frequency

adaptor on the preamplifier and connect it to the top socket (see section 2.5.2). If it is

your first time to use the microphone, it needs to be created in the transducer database

(see section 5.8) and calibrated (see section 5.3)

– Vibration measurements: Connect the accelerometer to the rear socket. Brüel & Kjær

recommends Accelerometer Type 8344 for low-level building vibration

measurements. If it is your first time to use the microphone, it needs to be created in

the transducer database (see section 5.8) and calibrated (see section 5.3)

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B&K 2250 Light Uživatelský manuál Strana 207