Rohde & Schwarz RTP044 - Page 301

Waveform analysis
R&S
®
RTP
301User Manual 1337.9952.02 ─ 12
To get useful results, check and adjust the following settings:
1. Place the analyzed step of the signal in the left half of the time domain diagram.
Use the "Reference point" or the horizontal "Position" of the trigger to move the sig-
nal.
See also: Chapter 5.4, "Acquire settings", on page 147.
2. Adjust the record lengths of the source signal and the math signal. The "Record
length" of the step-like source signal must be shorter than the number of points in
the resulting math function, which is set in the formula. See also: "Record length"
on page 148.
3. If the resulting math waveform is noisy, increase the "Average count" for the source
signal until the waveform is clear.
See also: Chapter 5.4.2, "Mode settings", on page 150.
7.3.4.11 Defining a formula in the formula editor
1. Open the "Menu" > "Math" dialog.
2. Select the Equation 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 294.
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.
Mathematics