GUI Reference
R&S
®
ZNC
154
User Manual 1173.9557.02 ─ 13
This function is disabled unless a memory trace is coupled to the active data trace. Trace
coupling ensures that the two traces have the same number of points so that the math-
ematical trace is well-defined.
Remote command:
User Defined
Activates the mathematical mode and displays the mathematical trace defined in the
"User Def Math" dialog. 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.
Remote command:
4.2.4.5
User Def Math (Dialog)
The "User Def Math" dialog defines 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.
The number of points belongs to the channel settings. Coupled data and memory traces
are always compatible because they have the same channel settings.
The analyzer processes only numeric values without units in the mathematical formulas.
No consistency check for units is performed.
Access:
TRACE > TRACE CONFIG > Mem Math > Def Math...
Trace Settings