Hioki 8847, Instruction Manual

Page: 232 / 372

13.3 Setting FFT Analysis Conditions
222

Octave Filter Setting
Filter features are based on JIS C1513-2002 class 1, class 2 (IEC61260).
After determining the entire power spectrum, the instrument performs octave analysis on the spectral
bands defined by the above filter characteristics.
See: "Octave Filter Characteristics"(

p.A26)

Analysis Modes and X/Y Axis Display
Normal
Filter characteristics approximate those
of an analog filter.
Sharp
Only those spectral component within the
octave band are used for analysis. Spec-
tral components outside of the octave
band are totally ignored.

: Settable, ×: Unsettable
Analysis Mode
X axis Y axis
Nyquist
display
Linear Log Lin-Mag Log-Mag Lin-Real Lin-Imag
OFF
× × × × × × ×
Storage Waveform

×

× × × ×
Histogram

×

× × × ×
Linear Spectrum
      
RMS Spectrum
     
×
Power Spectrum
   
× × ×
Power Spectrum Density
   
× × ×
LPC analysis (Power Spectrum
Density)
   
× × ×
Transfer Function
      
Cross Power Spectrum
      
Impulse Response

×

× × × ×
Coherence Function
  
× × × ×
Phase Spectrum
  
× × × ×
Auto-correlation Function

×

× × × ×
Cross-correlation Function

×

× × × ×
1/1 Octave
×
  
× × ×
1/3 Octave
×
  
× × ×
The x/y axes cannot be set when Nyquist Display is selected.