Rohde & Schwarz RTP Series - Page 293

Waveform analysis
R&S
®
RTP
293User Manual 1337.9952.02 ─ 12
Source 1 / 2
Defines the signal source to be evaluated by the math function. Waveform 1 of channel
signals can be selected.
Note: If you require other signal sources not listed here, use the formula editor provi-
ded in the Equation tab. Any waveform of any input channel can be used as a source.
See: Chapter 7.3.4, "Equation", on page 294.
Type
Defines the type of operation to be performed on the selected signal sources. The fol-
lowing functions are available:
Note: If you require other operators not listed here, use the formula editor provided in
the "Equation" tab. See: Chapter 7.3.4, "Equation", on page 294.
"+"
Adds up the sources
"-"
Subtracts source 2 from source 1.
"x"
Multiplies source 1 by source 2.
"|x|"
Determines the absolute value of the source.
"dx/dt"
Differentiates the source value with respect to the time value.
Not possible on envelope waveforms and waveforms with "Peak
detect" decimation.
"log(x)"
Calculates the logarithm of the source value based on 10.
"ln(x)"
Calculates the natural logarithm of the source value (based on e).
"ld(x)"
Calculates the binary logarithm of the source value (binary logarithm,
based on 2).
"Rescale"
Rescales the source values by a factor "a" and an offset "b": ax+b.
See also: "a / b" on page 293.
Noise reject
Only available for "Type" = "dx/dt".
Sets the number of neighboring samples that are skipped for differentiation.
To suppress noise effects during differentiation, it can be useful not to consider two
directly neighboring points to calculate dx (x
n
-x
n-1
). Instead, some samples in-between
are skipped and a point a few samples further is used (e.g. x
n
-x
n-3
).
a / b
Defines the values for the "Rescale" function (ax+b).
"a"
Is the factor the signal source is multiplied with.
"b"
Is the offset of the signal source on the y-axis.
7.3.3.2 Defining a formula in the Operator editor
1. Open the "Menu" > "Math" dialog.
Alternatively, press the [Math] key.
2. In the "Setup" tab, select the "Operator" tab.
Mathematics