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12.8 FFT Analysis Modes
278
Waveform Example
Transfer Function
From the input and output signals, the transfer function (frequency characteristic) of a measurement
system can be obtained. It can also be displayed as a Nyquist plot.
Main uses:
• To inspect a filter’s frequency characteristic
• To inspect the stability of a feedback control system (using the Nyquist plot)
• To inspect the resonance characteristic of an object using an impulse hammer and pick-up sensor
See:
About the Functions
"12.8.2 Analysis Mode Functions" (p.289), "Linear Time-Invariant Systems" (p.A14)
Axis
Display Type
Description
X axis
Linear
Frequency is displayed with equal spacing
Log
Frequency display of logarithm interval
Nyquist display
Displays the real-number component of the input-output ratio.
Y axis
Lin-Mag
Displays the input-output ratio linearly (dimensionless units).
Log-Mag(logarithm)
Displays the input-output ratio as dB values.
Lin-Real
Displays the real-number component of the input-output ratio (dimensionless
units).
Lin-Imag
Displays the imaginary component of the input-output ratio (dimensionless
units).
Nyquist display
Displays the imaginary component of the input-output ratio.
Normal display
X axis: Log
Y axis: Lin-Mag
Normal display
X axis: Log
Y axis: Log-Mag
Normal display
X axis: Log
Y axis: Lin-Real
Normal display
X axis: Log
Y axis: Lin-Imag
Lin‑Imag
Nyquist display
Summary of Contents for MR8740
Page 2: ......
Page 12: ...Contents x ...
Page 26: ...Operating Precautions 14 ...
Page 128: ...5 5 Miscellaneous Printing Functions 116 ...
Page 196: ...7 12 Setting Output Waveform Parameters 184 ...
Page 234: ...9 5 Numerical Calculation Type and Description 222 ...
Page 248: ...10 3 Waveform Calculation Operators and Results 236 ...
Page 302: ...12 8 FFT Analysis Modes 290 ...
Page 316: ...13 6 Editor Command Details 304 ...
Page 416: ...Appendix 4 FFT Definitions A26 ...
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