Rohde & Schwarz ESW Series, User Manual

Page: 214 / 759

Common Analysis and Display Functions
R&S
®
ESW
214 User Manual 1177.6298.02 ─ 08
Trace Math Function ................................................................................................... 214
Trace Math Position .................................................................................................... 214
Trace Math Mode ........................................................................................................ 214
Trace Math Function
Trace mathematics subtract the data of one trace from another trace and write the
results to a third trace.
When you turn on trace mathematics, you can select all parameters in the equation
arbitrarily from the corresponding dropdown menus (both operands and the result). For
example, you can subtract trace 1 from trace 3 and write the results to trace 5.
The result is a trace in dB that refers to the zero point defined with the Trace Math
Position setting.
Note that all traces in the equation must have a trace mode other than "Blank" or
"View".
You can turn off all trace mathematics with the "Trace Math Off" feature.
Remote command:
CALCulate<n>:MATH<t>:EXPRession[:DEFine]
on page 529
CALCulate<n>:MATH<t>:STATe
on page 530
Trace Math Position
Defines the zero point on the y-axis of the resulting trace in % of the diagram height.
The range of values extends from -100 % to +200 %.
Remote command:
CALCulate<n>:MATH<t>:POSition
on page 530
Trace Math Mode
Defines the mode for the trace math calculations.
"Lin" Activates linear subtraction, which means that the power level values
are converted into linear units prior to subtraction. After the subtrac-
tion, the data is converted back into its original unit.
This setting takes effect if the grid is set to a linear scale. In this case,
subtraction is done in two ways (depending on the set unit):
●
The unit is set to either W or dBm: the data is converted into W
prior to subtraction, i.e. averaging is done in W.
●
The unit is set to either V, A, dBmV, dBµV, dBµA or dBpW: the
data is converted into V prior to subtraction, i.e. subtraction is
done in V.
Trace Configuration