GUI Reference
R&S
®
ZNA
330
User Manual 1178.6462.02 ─ 12
●
If "Result is Wave Quantity" is disabled the analyzer assumes that the result of the
mathematical expression is dimensionless. Examples for dimensionless expres-
sions 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 vol-
tages.
Effect of "Result is Wave Quantity"
In the
, the "Show as" control element specifies whether
wave quantities are displayed as voltages or equivalent powers, using the port impe-
dances for a conversion between the two representations. "Result is Wave Quantity" is
relevant for mathematical traces displayed in units of dBm ("Show as": "Power" and
trace format "dB Mag" ):
If "Result is Wave Quantity" is on (checked), the mathematical trace values <W> are
interpreted as voltages and first converted into equivalent powers (<W> —> <P> =
<W>
2
/Re(Z
0
)). Results in "dB Mag" format are calculated according to <P>
log
= 10 * log
(<P>/1mW).
●
If "Result is Wave Quantity" is off, the mathematical trace values <W> are interpre-
ted as dimensionless quantities. Results in "dB Mag" format are calculated accord-
ing to <W>
log
= 20 * log (<W>).
Example:
A mathematical trace value amounts to 1 (real value); the port impedance is 50 Ω. If
"Result is Wave Quantity" is on, the analyzer assumes the trace value to be 1 V, which
is converted into a linear power of 20 mW, corresponding to approx. 13 dBm. With
"Result is Wave Quantity" off, the trace value 1 is directly converted into a logarithmic
power of 0 dBm.
Tip:
See also example for
CALCulate<Chn>:MATH:WUNit:STATe
.
Remote command:
CALCulate<Chn>:MATH:WUNit[:STATe]
Recall... / Save...
Recalls / saves a mathematical expression from / to a trace math string file. Trace math
string files are ASCII files with the default extension
*.mth
and contain the mathemati-
cal expression as it is written in the "User Def Math" dialog. It is possible to change or
create math string files using a text editor.
Remote command:
CALCulate<Chn>:MATH:WUNit[:STATe]
6.5.5
Time Domain Tab
The "Time Domain" tab enables and configures the time domain representation of the
measurement results.
Traces Softtool