R&S ZNB Series User Manual page 345

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R&S ZNB/ZNBT
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
trace points Trc1
Math
Different traces can be used in the same mathematical relation provided that they con-
tain the same number of points. The analyzer places no further restriction on the com-
patibility 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 formu-
las. No consistency check for units is performed.
Expression builder
The mathematical expression appears in the upper part of the dialog. The operands
and operators in the expression can be selected from a keyboard and the list of "Oper-
ands":
●
The keyboard supports the entry of numeric values, constants, and mathematical
functions. In addition to the numbers 0 to 9, the decimal point and the constants j
(complex unit), pi (approx. 3.14159) and e (approx. 2.71828), it contains the follow-
ing buttons:
–
User Manual 1173.9163.02 ─ 62
, Trcm of all traces 1 to m in the mathematical relation:
i i
= Fct. (c , ..., c , Trc1
i 1 n i
+/- changes the sign
, Trcm ), i = 1, no. of points
i
GUI reference
Trace Config softtool
, ..., c plus the
1 n
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