Soft-db Opus Suite Data Logger Module User Manual download pdf (Page 57)

Appendix 2: 1/3 Octave Filters – IEC 61260 Class 1/ANSI S1.11

1/3 Octave Filters

The 1/3 octave filters are computed at low-level in real time (at 48 kHz) on the digital signal

processor (DSP) of the Concerto system. The filters comply with all requirements of IEC 61260 for

Class 1.

Frequency Range

20 Hz to 20 kHz.

Filter Shape

The following curve presents the filter shape test done for the 1000 Hz 1/3 octave band. The red and

green curves represent the limits associated with the IEC standard (Class 1).

1/3 octave Filter Shape Test at 1000 Hz

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

100 1000 10000

Frequence (Hz)

Attenuation dB

Measurement High limit Low limit

1 2 ... 52 53 54 55 56 57 58 59 60 61 62

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Soft-db Opus Suite Data Logger Module User Manual Page 57