B&K 2250 Light, User Manual, Page: 130 / 208

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2250 Light – User Manual
13.3.2 Setting up a Measurement Manually
ISO 1996–2, Annex D
You can set the division between the Low and Middle frequency range, the division between
the Middle and High frequency range, and also the limits for the level differences between
adjacent bands – see Fig.13.3. (You can also refer to Fig.13.1 for a definition of the frequency
ranges and level differences.)
Fig.13.3
Left: Setting the ‘Low
Freq. Last Band’
parameter
Right: Setting the ‘Level
Difference Low’
parameter
You set the division between the Low/Middle frequency range by selecting the required value
for the
Last (or highest) Band in the Low frequency range (from 12.5 Hz to 315 Hz), and set
the division between the Middle/High frequency range by selecting the required value for the
Last (or highest) Band in the Middle frequency range (from 160 Hz to 20 kHz).
The ISO method does not state which frequency weighting should be used, so in the default
setup, A-weighing is selected. However, this is not described in the ISO method, so no
warnings will be generated if you select other frequency weightings.
13.3.3 Setting up the Measurement using the Default Setup
Select the Tone parameter above the spectrum and start the measurement by pressing the
Start/Pause pushbutton . If the selected setup parameters do not comply with the selected
tone assessment method, the following pop-up window will be displayed: