Agilent Technologies ENA Series Guia do Utilizador Página 340

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334 Chapter 9
Analysis in Time Domain (Option 010)
Overview
Overview
Overview of time domain measurement
The E5070B/E5071B Option 010 provides the time domain function, which is used to
mathematically transform waveforms in the frequency domain that can be measured with a
general network analyzer to waveforms in the time domain.
Figure 9-1 shows waveforms in the frequency domain and in the time domain when using
the same cable. The waveform in the frequency domain shows ripples due to mismatches,
but it is difficult to estimate their locations. On the other hand, from the waveform in the
time domain, you can determine the locations and magnitudes of mismatches.
Figure 9-1 Example of measurement in time domain and in frequency domain
Comparison to time domain reflectometry (TDR) measurement
The time domain function of the E5070B/E5071B is similar to the time domain
reflectometry (TDR) measurement in that it displays the response in the time domain.
In the TDR measurement, a pulse or step signal is inputted to the DUT and the change of
the reflected wave over time is measured.
On the other hand, the time domain function of the E5070B/E5071B changes the frequency
of the input signal to the DUT, performs measurement in the frequency domain, and
transforms the result to the response in the time domain using the inverse Fourier
transform.
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