Rohde & Schwarz RTM20 Series, Руководство пользователя, Страница: 131 / 499

FFT
R&S
®
RTM20xx
116 User Manual 1317.4726.02 ─ 01
FFT ..............................................................................................................................116
Wfm. Arithmetic ...........................................................................................................116
No. of Averages ..........................................................................................................117
Window .......................................................................................................................117
Y-Scaling .....................................................................................................................118
FFT-Setup ...................................................................................................................118
└ Span ..............................................................................................................119
└ Center ...........................................................................................................119
└ Y-Scale .........................................................................................................119
└ YT-Window ...................................................................................................119
└ Position .........................................................................................................120
└ Points ............................................................................................................120
Y(t)-Setup ....................................................................................................................120
└ Y-Scale .........................................................................................................120
└ Y-Position ......................................................................................................120
└ Main Time Base ............................................................................................120
└ Trigger Offset ................................................................................................121
└ Show Channels .............................................................................................121
FFT Off ........................................................................................................................121
FFT
The FFT key activates and deactivates a Fast Fourier Transformation (FFT) for the most
recently selected channel and provides functions to configure and display FFTs.
If activated, the FFT key lights up. Two windows are displayed: the signal vs. time window
at the top, and the result window of the FFT analysis at the bottom.
When deactivated, the previous display is restored.
To display the FFT for a different channel, press the corresponding channel key.
Remote command:
CALC:MATH:EXPR "FFTMAG(CHx)"
; see also
​
CALCulate:
​
MATH<m>[:
​
EXPRession][:
​
DEFine]
​
on page 346.
Wfm. Arithmetic
Defines the arithmetic mode for FFT calculation and display.
"None" The FFT is performed without any additional weighting or postprocess-
ing of the acquired data. The new input data is acquired and displayed,
and thus overwrites the previously saved and displayed data.
Reference for FFT key