VNA GUI Reference
R&S
®
ZNL/ZNLE
331
User Manual 1178.5966.02 ─ 07
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 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:
–
+/- changes the sign
–
The effect of the basic arithmetic operators (/, *,
–
, +) and the mathematical
Products of numbers and constants may be entered in abbreviated form, e.g.
2e for 2*e.
–
The Clear, Del, Back buttons are used to correct faulty entries.
Trace Softtool
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Allice Messtechnik GmbH
