B&K 2250 Light Manual de usuario descargar pdf (Pagina 184)

172

Hand-held Analyzer Types 2250 and 2270 – User Manual

If you select the tone assessment method according to the ISO 1996-2, Annex D standard, you

can accept the default setup according to that standard. You can then change the various tone

parameters according to your needs (apart from the ISO 226 parameter which is greyed-out)

and proceed directly to the measurement.

If you select the tone assessment method according to Italian Law (that is, you select

DM 16-03-1998), then you have accepted the default setup for that standard, and the only

parameter you can change is the ISO 226 parameter. Select one of the diffuse- or free-field

contour options available from the parameter drop-down (which appears when you tap the

parameter). For more details and for information on how to set up individual tone assessment

parameters, see the following section.

15.4.2 Setting up a Measurement Manually

ISO 1996–2, Annex D

When tone assessment according to ISO 1996-2, Annex D is selected, 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.15.5. (You can also refer to Fig.15.1 for a definition of the frequency ranges and level

differences.)

Fig.15.5

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.

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B&K 2250 Light Manual de usuario Pagina 184