GUI Reference
R&S
®
ZNC
156
User Manual 1173.9557.02 ─ 13
Table 4-1: Effect of the operators on a complex quantity z = x + jy.
+, -, *, /
Basic arithmetic operations
()
Grouping parts of an expression
Lin Mag
|z| = sqrt ( x2 + y2 )
x
y
Exponential, e.g. z^2
dB Mag
dB Mag(z) = 20 * log|z| dB
Arg
Phase φ (z) = arctan ( Im(z) / Re(z) )
Re, Im
x, y (Real and Imag)
log, ln
Common (base 10) or natural (base e) logarithm
Min, Max
Smaller or larger values of all points of two traces, e.g. Min(Trc1,Trc2)
StimVal *)
Stimulus value*)
tan, atan, sin, asin, cos, acos
Direct and inverse trigonometric functions.
*) The function StimVal can be used for all sweep types. Please note that - as with all
user math operands - only the numerical value without unit is processed in the user math
formula.
●
In frequency sweeps StimVal provides the stimulus frequency in Hz.
●
In power sweeps, StimVal provides the voltage in V that results from the source power
in dBm. To obtain the correct source power in dBm (for "dB Mag" trace format),
"Result is Wave Quantity" must be enabled. Note that, due to the conversion into a
dBm value, the source power depends on the reference impedance of the port asso-
ciated with the measured wave quantity, to be set in the "Balanced Ports" dialog.
●
In time sweeps, StimVal is the stimulus time in s.
●
In CW mode sweeps, StimVal is the number of the point.
Remote command:
Result is Wave Quantity
Controls the conversion and formatting of the mathematic expression.
●
If "Result is Wave Quantity" is enabled the analyzer assumes that the result of the
mathematical expression represents a voltage. Examples for voltage-type expres-
sions are all terms proportional to a wave quantity (e.g. 1.1*Data, if a wave quantity
is measured) or to a stimulus value of a power sweep. If "Show As: Power" is selected
in the "More Wave Quantities" dialog, the result is converted into a linear power before
the selected trace format is applied. Otherwise no conversion is performed, and "dB
Mag" results are referenced to 1 μV.
●
If "Result is Wave Quantity" is disabled the analyzer assumes that the result of the
mathematical expression is dimensionless. Examples for dimensionless expressions
are all terms proportional to ratios of wave quantities, e.g. "Data / Mem2[Trc1]". The
selected trace format is applied without previous conversion.
"Result is Wave Quantity" acts on the result of the mathematical expression only. Wave
quantities and power sweep stimulus values always enter into the expression as voltages.
Effect of "Result is Wave Quantity"
Trace Settings
