User`s guide

Chapter 9 337
Analysis in Time Domain (Option 010)
Transformation to time domain
9. Analysis in Time Domain
(Option 010)
Selecting a type
There are two types of transformation to the time domain: band pass and low pass. The
appropriate transformation type depends on the DUT.
Comparison between band pass mode and low pass mode
Item Band pass Low pass
Appropriate DUT DUTs that do not operate with dc current
such as band pass filters.
DUTs that operate with dc current such as
cables.
Input signal You can simulate the response to the
impulse signal.
You can simulate the TDR measurement.
You can simulate the response to both the
impulse signal and step signal.
Selection of the
sweep range
You can select the sweep range arbitrarily. Because dc data are estimated from the
first few points, the frequencies of
measurement points must be multiples of
the start frequency.
Transmission/
reflection
measurement
You can perform both transmission and
reflection measurements.
You can perform both transmission and
reflection measurements.
Identification of
mismatches
You can identify the locations of
mismatches.
You can identify the locations of
mismatches and the type of impedance
(capacitive or inductive).
Resolution The resolution in the time domain
increases by two times over that in the
band pass mode.
Available data
format
R Liner magnitude format
• In the reflection measurement, it
indicates the mean of the reflection
coefficient within the frequency
sweep range.
• In the transmission measurement,
it indicates the mean of the
transmission coefficient within the
frequency sweep range.
R Log magnitude format
• In the reflection measurement, it
indicates the mean of the return
loss within the frequency sweep
range.
• In the transmission measurement,
it indicates the mean of the
transmission gain within the
frequency sweep range.
R SWR format
• In the reflection measurement, it
indicates the mean of SWR
(standing wave ratio) within the
frequency sweep range.
R Real format
• In the low pass mode, the real
format is useful because the time
axis data do not have phase
information.