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Balanced Ports, Option 77
12-3 Typical Measurements
12-3 Typical Measurements
The following description uses S
as an example. The same measurements can be made on
d1d1
any of the other parameters: S
, S
, or S
.
c1c1
c1d1
d1c1
The differential match, or S
, can be viewed in the frequency domain. It represents the
d1d1
reflections from the differential port of the device under test.
Figure 12-2
shows the Log
Magnitude display of S
(essentially the return loss) of a differential cable. A segmented
d1d1
limit line with pass/fail alarm is used to verify that this cable meets its specifications.
Figure 12-2. Differential S
Log Magnitude Display of S
11
d1d1
In addition to looking at the frequency response of S
, the VNA Master (when equipped
d1d1
with Option 2) can display the time or distance domain response (or both) of S
. This
d1d1
powerful display allows you to check for impedance discontinuities on the differential line.
Vector Network Analyzer MG
PN: 10580-00289 Rev. K
12-3
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