Hioki MEMORY HiCORDER 8855, Instruction Manual

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4.3 STATUS Settings (FFT)
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4.3.17 Octave Filter Setting
Function
display Meaning
: Filter characteristics approximate the characteristics used for
conventional octave analyzers with analog filters.
:
Spectrum components outside the octave band are excluded totally
and only the spectrum in the octave band is bundled and used for
analysis.
1/1-octave (1/3-octave)
normal filter characteristics
1/1-octave (1/3-octave)
sharp filter characteristics
NOTE
When octave analysis has been selected, two different filter types can be
chosen.
The characteristics of both filter types are within ANSI CLASS 3 tolerance
limits (1/3 octave only).
Procedure
Screen: STATUS
1. Select "OCTAVE ANALYSIS" in FFT analysis mode, and the
Octave Filter
item is shown.
2. Move the flashing cursor to the
Octave Filter
item.
3. Use the function keys to make a selection.
This instrument does not use analog filters. It first determines the entire
power spectrum and then uses weighting by bundling the spectrum to
achieve the desired filter characteristics.