Rohde & Schwarz R&S ZVA 8 - Math = User Def; User Def. Math

R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.55 E-6
• Data & Trace Funct. -> Mem stores the current state of all data traces modified by the trace
functions to memory traces. If a trace has no memory trace, then a new memory trace is
created.
• Data & Trace Funct. -> New Mem stores the current state of all data traces modified by the
t
race functions to new memory traces, leaving the existing memory traces unchanged.
Trace functions
The trace functions comprise the following mathematical operations:
• Any mathematical relation applied to the trace (Math = Data/Mem, Math = User Def).
• A shift of the trace in horizontal or vertical direction (Shift Response Value, Shift Stimulus
Value).
Data —> Mem and Data —> NewMem store the raw trace without the trace functions, Data & Trace
Funct —> Mem and Data & Trace Funct —> NewMem store the trace after it has been transformed
using the trace functions.
Remote control:
TRACe:COPY <memory_trc>,<data_trc>
Math = User Def
Activates the mathematical mode and displays the mathematical trace defined via Define Math. The
mathematical trace replaces the active data trace in the diagram area; it is updated as the
measurement goes on and the analyzer provides new active trace data.
This function is disabled unless a user-defined mathematical trace is available.
Math = User Def and Math = Data/Mem are alternative options of the mathematical mode.
Selecting one option disables the other. The mathematical expression defined via Define Math is not
affected.
Remote control:
CALCulate<Ch/Tr>:MATH[:EXPRession]:SDEFine <string>
CALCulate<Ch/Tr>:MATH:STATe ON
User Def. Math...
Opens a dialog to define a mathematical relation between traces and calculate a new mathematical
trace. Each measurement point of the active trace is replaced by the corresponding point of the
mathematical trace.
Compatibility between traces in mathematical relations
Mathematical traces are either constant functions or functions of one or more data or memory traces.
They are calculated on a point-to-point basis. Each trace point no. i of the mathematical trace is
calculated from a set of constant values c
1
, ..., c
n
plus the trace points Trc1
i
, Trcm
i
of all traces 1 to m in
the mathematical relation:
Math
i
= Fct. (c
1
, ..., c
n
, Trc1
i
, Trcm
i
), i = 1, no. of points
Different traces can be used in the same mathematical relation provided that they contain the same
number of points. The analyzer places no further restriction on the compatibility of traces, e.g. the
sweep points of the traces do not have to be the same.