Agilent Technologies E5070B, User Manual

Page: 298 / 769

292 Chapter 7
Fixture Simulator
Obtaining Characteristics After Embedding/De-embedding 4-port Network
Step 6. Press
Type (nwk1)
and select a processing type for network 1.
Softkey Function
None
Specifies no-processing (equivalent to turning off the feature)
Embed
Selects embedding
De-Embed
Selects de-embedding
NOTE
If you have not specified an appropriate file in Step 5, you cannot select embedding
(
Embed
) or de-embedding (
De-embed
). If you have not specified an appropriate file and
you try to select embedding/de-embedding, an error occurs and no-processing (
None
) is
automatically selected.
Step 7. If you have selected topology C, also make the necessary settings for network 2 (
nwk2
).
Step 8. Press
De-Embedding S4P
to turn
ON
the 4-port network embedding/de-embedding
feature.
Step 9. Press
Return
.
Step 10. If
Fixture Simulator
is
OFF
, press the key to turn it
ON
.
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.