Agilent Technologies 24A Guia do Utilizador descarregar pdf (Página 215)

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Making Time Domain Measurements

Gating

Gating provides the ﬂexibility of selectively removing time domain responses. The

remaining time domain responses can then be transformed back to the frequency domain.

For reﬂection (or fault location) measurements, use this feature to remove the effects of

unwanted discontinuities in the time domain. You can then view the frequency response of

the remaining discontinuities. In a transmission measurement, you can remove the effects

of multiple transmission paths.

Figure 3-26a shows the frequency response of an electrical airline and termination. Figure

3-26b shows the response in the time domain. The discontinuity on the left is due to the

input connector. The discontinuity on the right is due to the termination. We want to

remove the effect of the connector so that we can see the frequency response of just the

airline and termination. Figure 3-26c shows the gate applied to the connector

discontinuity. Figure 3-26d shows the frequency response of the airline and termination,

with the connector "gated out."

Figure 3-26 Sequence of Steps in Gating Operation

1 2 ... 210 211 212 213 214 215 216 217 218 219 220 ... 452 453

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Agilent Technologies 24A Guia do Utilizador Página 215

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