GUI Reference
R&S
®
ZNC
157
User Manual 1173.9557.02 ─ 13
In the "More Wave Quantities" dialog, the "Show as:" control element specifies whether
wave quantities are displayed as voltages or equivalent powers, using the port impedan-
ces for a conversion between the two representations. "Result is Wave Quantity" is rel-
evant 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 interpreted
as dimensionless quantities. Results in "dB Mag" format are calculated according 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:
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 mathematical
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:
4.2.4.6
Trace Config > All Mem All Data
Performs actions on all data or memory traces in the active recall set.
Background information
Refer to
Access:
TRACE > SCALE key or Alt + Shift + D
Trace Settings
