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