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minimum window
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2. Measurement Range
Figure 6-6 Effects of Different Windows
In time domain measurements, the measurement range is defined as the maximum length of time that
can be set, and no repeated response occurs when measurements are taken over this length of time.
The measurement range is inversely proportional to the response resolution. If one is increased, the
other is decreased.
The time domain waveform is a periodic signal that repeats over time, so a repetitive response occurs.
The repeated response (false response) is not the true response of the kit under test, which only occurs
at specific time intervals (1/sweep point frequency interval), so the measurement range is determined by
the frequency interval ΔF of the sweeping point:
For time domain measurements, the maximum measurable stop time is: 1/ΔF. In the reflection
measurement, since the signal will circle within the kit to be tested, the maximum measurement distance
is:
Distance
0.5
Points
1
Speed of light
Velocity
Span
of actor
∆
F =
sweep span
sweep points - 1
For example
：
Sweep span = 1GHz
Sweep points = 201
∆
F = 5MHz
Figure 6-7 Definition of the Sweeping Point Frequency Space
The measurement range is proportional to the number of sweep points -1, which is inversely proportional
to the span. To improve the measurement range, the following two settings can be modified:
Increase the number of sweep points
Decrease the frequency span.
∆
F
