Agilent Technologies ENA Series User Manual page 298

Fixture Simulator
Obtaining Characteristics After Embedding/De-embedding 4-port Network
Step 6. Press
Softkey
None
Embed
De-Embed
NOTE If you have not specified an appropriate file in Step 5, you cannot select embedding
(
Embed
you try to select embedding/de-embedding, an error occurs and no-processing (
automatically selected.
Step 7. If you have selected topology C, also make the necessary settings for network 2 (
Step 8. Press
feature.
Step 9. Press
Step 10. If
NOTE When the 4-port network embedding/de-embedding feature reads a 4-port Touchstone data
file, it does not automatically convert the file's normalized impedance value to adapt to the
port reference impedance setting value of the analyzer. If a 4-port Touchstone data file that
has a different normalized impedance value than that of the port reference impedance
setting value that is read in by the analyzer, correct measurement results will not be
obtained. Therefore, when you create a 4-port Touchstone file, be sure that the normalized
impedance value in the data file is the same as the port reference impedance value of the
analyzer specified for actual measurement. When you create a 4-port Touchstone file using
the VBA macro on the E5070B/E5071B, set the port reference impedance value to your
desired value before executing the macro.
A Touchstone data file is defined for a single normalized impedance value. Thus, when
reading in a Touchstone data file with the 4-port network embedding/de-embedding
feature, be sure to specify the same port reference impedance value to every measurement
port pair connected to the same 4-port network. Taking the topology C in Figure 7-6 for
example, the port reference impedance of the analyzer measurement port pair of ports 1
and 2 and that of the measurement port pair of ports 3 and 4 must be set to the same value.
When a 4-port Touchstone data file is read in, data for up to 3202 frequency points are read
in by using interpolation according to the measurement frequency point setting of the
analyzer. If the number of frequency points in the file is greater than 3202, excess data are
ignored.
292
and select a processing type for network 1.
Type (nwk1)
Function
Specifies no-processing (equivalent to turning off the feature)
Selects embedding
Selects de-embedding
) or de-embedding (
De-embed
to turn
De-Embedding S4P
.
Return
is , press the key to turn it
Fixture Simulator OFF
). If you have not specified an appropriate file and
the 4-port network embedding/de-embedding
ON
.
ON
) is
None
).
nwk2
Chapter 7