B&K 2250 Light Manual do Utilizador descarregar pdf (Página 46)

CHAPTER 4

Specifications

4.9 Measuring Range

Note: Type 2250 has a single measuring range. The instrument, therefore, has no measuring range (or

level range) controls.

The Upper Limit in the following sections is based on the guaranteed worst-case limit for Type 2250

and the nominal Open Circuit Sensitivity of the microphone. The Overload Limit can, due to tolerances

in Type 2250, be up to 1.5 dB higher than the worst-case limit, but tolerances specified in the Interna-

tional Standards are maintained as long as no Overload is indicated. The Overload Limit is equal to the

Max. Input Level as displayed on the Details tab of the Calibration display, selected from the Main

Menu.

The Lower Limit in the following sections is based on the guaranteed worst-case limit for Type 2250

and the nominal Open Circuit Sensitivity of the microphone, under Reference Environmental Condi-

tions.

4.9.1 Maximum Sound Level

The maximum Sound Level that the Sound Level Meter can accomodate without causing damage to

the Sound Level Meter: 159 dB

4.9.2 Total Range

The difference between the Upper Limit on the least sensitive level range, and the lowest sound

pressure level measurable on the most sensitive level range, which can be measured at 1 kHz within the

most conservative tolerance limits, specified in the International Standards IEC 60651, IEC 60804 and

IEC 61672–1:

4.9.3 Primary Indicator Range

Primary Indicator Range according to the International Standard IEC 60651:

Table 4.3

Total range

Frequency Weighting

A-weighting

(dB)

C-weighting

(dB)

Z-weighting

(dB)

Z-weighting

(dB)

Extended Low

Frequency

140 – 26.6 140 – 27.5 140 – 32.6 140 – 39.6

Table 4.4

Primary Indicator

Range

Upper

Limit

(dB)

Lower Limit

A-weighting

(dB)

C-weighting

(dB)

Z-weighting

(dB)

Z-weighting

(dB)

Extended Low

Frequency

125 25.7 26.3 31.4 38.4

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