
247
FFT Calculation Types
RMS spectrum
The RMC spectrum calculates an input signal amplitude (RMS values) of each frequency band and
plots the calculation results on a graph with a horizontal axis that indicates a frequency.
The RMS spectrum shows the same calculation result as the power spectrum that logarithmically
describes amplitudes in decibels.
Main uses:
To analyze an RMS value of each frequency component included in a waveform.
See “Calculation types and internal calculation formulas” (p. 254).
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.
Amplitude (decibel) Indicates analyzed data in decibels. (Reference of 0 dB: 1 eu)*
Real part (linear)
Indicates the real part of analyzed data.
Imaginary (linear)
Indicates the imaginary part of analyzed data.
* (Eu: engineering unit) The level is calculated using a reference value in terms with an engineering unit
presently set.
(For example, when the unit is set to volts, 0 dB is equivalent to 1 V.)
Examples of waveforms
Normal display
Horizontal axis: logarithmic
Vertical axis: amplitude (linear)
Normal display
Horizontal axis: logarithmic
Vertical axis: amplitude (decibel)
Normal display
Horizontal axis: logarithmic
Vertical axis: real part (linear)
Normal display
Horizontal axis: logarithmic
Vertical axis: imaginary (linear)
FFT
Calculation Function
HIOKI MR6000A966-03
Summary of Contents for Memory HiCorder MR6000
Page 2: ...HIOKI MR6000A966 03...
Page 56: ...50 Displaying Measured Values HIOKI MR6000A966 03...
Page 152: ...146 Triggering the Instrument Using CAN Signals CAN Trigger HIOKI MR6000A966 03...
Page 194: ...188 Numerical Calculation Types and Descriptions HIOKI MR6000A966 03...
Page 266: ...260 Configuring the Display Settings HIOKI MR6000A966 03...
Page 391: ...HIOKI MR6000A966 03...
Page 392: ...HIOKI MR6000A966 03...