VNA GUI reference
R&S
®
ZNL/ZNLE
315
User Manual 1178.5966.02 ─ 19
Time Start / Time Stop / Time Center / Time Span
Defines the display range for the time domain trace in time representation (see
●
"Time Start" is the lowest displayed time and corresponds to the left edge of the
Cartesian diagram.
●
"Time Stop" is the highest displayed time and corresponds to the right edge of the
Cartesian diagram.
●
"Time Center" corresponds to the center of the Cartesian diagram, i.e. ("Time Start"
+ "Time Stop")/2.
●
"Time Span" corresponds to the diagram width, i.e. ("Time Stop" – "Time Start").
"Time Start" and "Time Stop" or "Time Center" and "Time Span" are alternative set-
tings.
Remote command:
CALCulate<Chn>:TRANsform:TIME:STARt
CALCulate<Chn>:TRANsform:TIME:STOP
CALCulate<Chn>:TRANsform:TIME:CENTer
CALCulate<Chn>:TRANsform:TIME:SPAN
Distance Start / Distance Stop / Distance Center / Distance Span
Defines the display range for the time domain trace in distance representation (see
"Distance Start" and "Distance Stop" or "Distance Center" and "Distance Span" are
alternative settings.
Remote command:
n.a.
See
Time Start / Time Stop / Time Center / Time Span
Time / Distance
"Time" and "Distance" switch over between the x-axis scaling in time units or distance
units.
The interpretation of time and distance depends on the measurement type. For reflec-
tion measurements (S-parameters S
ii
or ratios with equal port indices), the time axis
represents the propagation time of a signal from the source to the DUT and back. For
transmission measurement, it represents the propagation time from the source through
the device to the receiver.
The distance between the source and the DUT is calculated from the propagation time,
the velocity of light in the vacuum, and the velocity factor of the receiving port:
●
Distance = <Time> * c
0
* <Velocity Factor>
for transmission measurements
●
Distance = 1/2 * <Time> * c
0
* <Velocity Factor>
for reflection measurements. The
factor 1/2 accounts for the return trip from the DUT to the receiver.
Stimulus softtool