274
FFT Analysis Modes
Nyquist display
• If the cursor is displayed, the total harmonic distortion (THD) with the fundamental wave set to the
cursor position will be displayed. When 2 cursors appear, the A cursor becomes the fundamental
wave. When results cannot be obtained,
[---%]
is displayed.
• When only sine waves are input, the level of this component becomes approximately 1.4 times (3 dB)
larger than the overall value. To measure at a reference the same as the overall value, analyze using
RMS spectrum or power spectrum.
Refer to “RMS Spectrum” (p. 274) or “Power Spectrum” (p. 275).
RMS Spectrum
The oscillation component (actual value) is calculated from the frequency axis waveform of the
input signal.
RMS and power spectra displays use the same analysis results displayed logarithmically
(amplitude in dB).
Main uses:
• To inspect the execution value of the frequency component of the waveform
• To inspect the RMS value of each frequency
About the Functions, refer to “13.9.2 Analysis Mode Functions” (p. 289).
Axis
Display type
Description
X axis
Linear
Displays the frequency on a linear scale
Log
Displays the frequency on a logarithm scale
Y axis
Lin-Mag
Displays analysis values linearly.
Log-Mag
Display analysis results as dB values. (0 dB reference value: 1eu)*
Lin-Real
Display the real-number component of analysis values.
Lin-Imag
Display the imaginary component of analysis values.
* eu: engineering units that are currently set are the standard (e.g., when the unit settings is volts, 0 dB = 1 V)
Содержание MR8827
Страница 19: ...14 Operation Precautions ...
Страница 81: ...76 Start and Stop Measurement ...
Страница 111: ...106 Manage Files ...
Страница 125: ...120 Miscellaneous Printing Functions ...
Страница 143: ...138 View Block Waveforms ...
Страница 191: ...186 Setting Output Waveform Parameters ...
Страница 291: ...286 FFT Analysis Modes Measurable Ranges With Octave Analysis 1 1 OCT 1 3 OCT ...
Страница 292: ...287 FFT Analysis Modes 1 1 OCT 1 3 OCT 13 FFT Function ...
Страница 293: ...288 FFT Analysis Modes 1 1 OCT 1 3 OCT ...
Страница 295: ...290 FFT Analysis Modes ...
Страница 309: ...304 Editor Command Details ...
Страница 387: ...382 Module Specifications ...
Страница 405: ...400 Dispose of the Instrument Lithium Battery Removal ...
Страница 431: ...A26 FFT Definitions ...
Страница 436: ......