User manual
Mathematics
R&S
®
RTO
181User Manual 1316.0827.02 ─ 06
6 Mathematics
The R&S RTO provides different methods of creating mathematical waveforms:
●
Applying mathematical functions to source data
●
Performing FFT analysis on source data
6.1 +Mathematical Waveforms
Math waveforms are the results of various calculations or FFT analysis. You can define
up to four math waveforms and display them on the screen, and/or use it as source for
further analysis.
You can also store a math waveform as a reference waveform and restore it any time
later, see "To save a reference waveform" on page 208.
The vertical scale of a math waveform is adapted automatically to the measurement
results to ensure optimal display. Furthermore, you can scale each math waveform man-
ually in vertical direction like a channel waveform.
As for channel waveforms, you can also change the arithmetic mode for the waveform
to display the envelope or an average over several calculations.
6.1.1 Displaying Math Waveforms
Math waveforms can be displayed in addition to the channel and other waveforms. They
also can be used for analysis, e.g. measurements, even if the math waveform is not
active.
1. In the "Math" menu, select "Math Setup", or press the MATH key.
2. Define the math expression to be calculated in one of the following ways:
●
chapter 6.2.1.1, "Defining a Formula in the Optimized Graphical Edi-
tor", on page 185
●
chapter 6.2.2.1, "Defining a Formula in the Advanced Formula Edi-
tor", on page 187
●
chapter 6.3.2, "Configuring FFT Waveforms", on page 196
3. In the "Math Setup" dialog box, in the "Setup" tab, tap the "Enable math signal" icon
so it is highlighted.
The math waveform is displayed on the screen.
4. To change the vertical scaling of the math waveform, tap the "Manual" icon, then
enter the "Vertical scale" factor (per division) and add, if necessary, a "Vertical off-
set". By default, automatic scaling is performed.
Tip: You can also use the vertical SCALE rotary knob for scaling. In this case, the
scale mode is set to "Manual" temporarily.
+Mathematical Waveforms