Instruction manual

127
Technical Notes
1/3-Octave Filter Characteristics
The characteristics of the 1/3-octave filter in the NA-27 correspond to the JIS C 1513-
1983 Type III, 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 1/3-octave filter in the NA-27.
Important
The frequency range of the NA-27 is 20 Hz to 12500 Hz.
Precision for data outside of this range is not assured, and
data should be used only as a general reference.