Hioki Memory HiCorder MR6000, Instruction Manual, Page: 256 / 392

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FFT Calculation Types
Phase spectrum
The phase spectrum analyzes phase characteristics of an input signal.
Main uses:
• To analyze the phase spectrum of channel 1 The phase of a cosine waveform is indicated using a
reference of 0°.
• To analyze the phase difference between channels 1 and 2
See “Calculation types and internal calculation formulas” (p. 254).
1ch FFT: The 1ch FFT displays the phase of a signal obtained across channel 1. The phase of a cosine
waveform is indicated using a reference of 0°. A non-synchronized time-domain waveform causes
phase values to be unstable.
2ch FFT: The 2ch FFT displays the phase difference between channels 1 and 2. Positive values indicate
that the phase of channel 2 leads channel 1.
Axis Display type Description
Horizontal axis
(X-axis)
Linear Indicates a frequency on a linear scale.
Logarithmic Indicates a frequency on a logarithm scale.
Vertical axis
(Y-axis)
Amplitude (linear) Indicates analyzed data on a linear scale.
Examples of waveforms
1ch FFT
Horizontal axis: logarithmic
Vertical axis: amplitude (linear)
2ch FFT
Horizontal axis: logarithmic
Vertical axis: amplitude (linear)
The instrument with a cursor enabled displays the total harmonic distortion factor (THD) regarding
the cursor position as the fundamental wave. When displaying the two cursors, the instrument
regards the A cursor as the fundamental wave. When no results have been obtained, the instrument
displays the string [---%] .
HIOKI MR6000A966-03