B&K 2250 Light Instrukcja Użytkownika Pobierz pdf (Strona 51)

Hand-held Analyzer Type 2250 –

Instruction Manual

4.11.2 1/3-Octave band Cente Frequencies

Nominal: 6.3 Hz

, 8.0 Hz

, 10 Hz

, 12.5 Hz, 16 Hz, 20 Hz, 25 Hz, 31.5 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz,

100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz,

1.6 kHz, 2 kHz, 2.5 kHz, 3.15 kHz, 4 kHz, 5 kHz, 6.3 kHz, 8 kHz, 10 kHz, 12.5 kHz, 16 kHz

, 20 kHz

Exact (5 digits): 6.201 Hz, 7.8125 Hz, 9.8485 Hz, 12.401 Hz, 15.625 Hz, 19.697 Hz, 24.803 Hz,

31.25 Hz, 39.373 Hz, 49.616 Hz, 62.5 Hz, 78.745 Hz, 99.213 Hz, 125 Hz, 157.49 Hz, 198.43 Hz, 250 Hz,

314.98 Hz, 396.85 Hz, 500 Hz, 629.96 Hz, 793.70 Hz, 1 kHz, 1.2599 kHz, 1.5874 kHz, 2 kHz,

2.5198 kHz, 3.1748 kHz, 4 kHz, 5.0397 kHz, 6.3496 kHz, 8 kHz, 10.079 kHz, 12.699 kHz, 16 kHz,

20.159 kHz

Real-time frequency range: 6.3 Hz to 20 kHz, centre frequencies.

Fig.4.29

The shapes of the

1/3-octave band

filters (from 0 to

–80dB). The

innermost and

outermost curves

show IEC 61260

tolerances

Fig.4.30

The shapes of the

1/3-octave band

filters (from 0 to

–3.5dB). The

innermost and

outermost curves

show IEC 61260

tolerances

4.11.3 Linear Operating Range

Linear Operating Range according to the International Standard IEC 61260, for electrical input, for all

filters in the filter banks:

1 Only accessible when Extended Low Frequency set to On in the Setup menu.

2 These filters do not fulfil the requirements of paragraph 7.2.3 in the ANSI S1.11-1986 standard. The paragraph states, at which

frequency the anti-alias filter cut-off should be set. For the realisation of the filters in Type 2250, this has no influence on the

quality of the measurements.

Response

(dB)

– 20

– 40

– 60

– 80

980473e

0.1 1

Multiple of Center Frequency

Response

(dB)

0.5

– 0.5

– 1.5

– 2.5

– 3.5

980471e

0.85 1

Multiple of Center Frequency

1.15

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