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Technical Notes
1/1-Octave Filter Characteristics
The characteristics of the 1/1-octave filter in the NA-27 correspond to the JIS C 1513-
1983 Type II, ANSI S1.11 Type 1D, and IEC 1260 1995 Class 1 specifications.
The graph below shows the allowable attenuation tolerance according to JIS and the actual
characteristics of the 1/1-octave filter in the NA-27.