R3765/67G Series Network Analyzer Operation Manual
7.5 Calibration
7-33
(2) The signal flow graph below shows the error model.
Directivity : The directivity connector/bridge which is used for the
reflection measurement detects the reflection signal from
the sample device. However, it actually detects not only the
reflection signal but also few incidence signals.
The limitation where the reflection signal and the incidence
signal can be separated is called a “directivity”.
Source match : The reflection signal from the sample device reflects at the
signal source and is injected in the sample to make errors.
The reflection coefficient at that signal source is called a
“source match”.
Frequency tracking : Is the frequency characteristics of the measurement
system including the cable and connector.
RF IN
S
11M
E
D
E
R
1
E
S
S
11A
S
11M
= E
D
+
E
D
E
R
E
S
S
11M
S
11A
: Directivity
: Frequency tracking
: Measure data (before calibration)
S
11A
E
R
1 - E
S
S
11A
: Source match
: Actual data
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