Waveform analysis
R&S
®
RTE
309User Manual 1326.1032.02 ─ 20
– "Phase unit"
7.3.4.10 Defining a formula in the formula editor
1. In the "Math" menu, select the "Setup" tab.
2. Select the "Advanced" tab.
3. Double-tap the editing area.
The "Formula Editor" is displayed.
4. Enter the math formula including all required signal sources and operators by
selecting the corresponding keys in the editor. For details on the available keys,
see Chapter 7.3.4.1, "Formula editor", on page 301.
5. To insert a physical unit in the formula, proceed as follows:
a) If necessary, insert a decimal prefix using the "M/k/µ" key.
b) Insert an opening square bracket using the "[" key.
c) Insert the physical unit using the "V/A/Ω" key.
d) Insert a closing square bracket using the "]" key.
The resulting expression could be, for example: m[V]
6. To perform a rescaling function, proceed as follows:
a) Select the rescaling function using the "ax+b" key.
b) Behind the left bracket, insert the signal source using one of the following keys:
● "Ch" for a channel
● "Math" for a math function
● "Ref" for a reference waveform
● "Meas" for a measurement
c) Insert a comma using the "," key.
d) Insert the "a" value, i.e. the scaling factor, using the number keys.
e) Insert a comma using the "," key.
f) Insert the "b" value, i.e. the scaling offset, using the number keys.
g) Insert the closing bracket using the ")" key.
The resulting expression could be, for example: rescale(Ch1Wfm1,3,4)
7.3.5 Filters
The R&S RTE provides several ways to filter the input signal:
●
Lowpass filter by selecting a bandwidth limit in the acquisition path (vertical chan-
nel settings)
See "Bandwith" on page 188
●
Digital lowpass filter
See Chapter 5.8, "Digital filter setup", on page 230
●
FIR filter to create a filtered math waveform (lowpass, highpass, bandpass)
Mathematics
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