Atek HP 8753D, User Manual, Page: 293 / 677

S-parameters are exactly equivalent to the more common description terms below , requiring
only that the measurements be taken with all test device ports properly terminated.
S-P arameter Denition T est Set
Description
Direction
S
11
b
1
a
1
a
2
= 0 Input reection coecient FWD
S
21
b
2
a
1
a
2
= 0 F orward gain FWD
S
12
b
1
a
2
a
1
= 0 Reverse gain REV
S
22
b
2
a
2
a
1
= 0 Output reection coecient REV
The S-P arameter Menu
The S-parameter menu allows you to dene the input ports and test set direction for
S-parameter measurements . The analyzer automatically switches the direction of the
measurement according to the selections you made in this menu. Therefore , the analyzer can
measure all four S-parameters with a single connection. The S-parameter being measured is
labeled at the top left corner of the display .
The S-parameter menu contains the following softkeys:
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Refl: FWD S11 (A/R)
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Trans: FWD S21 (B/R)
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Trans: REV S12 (A/R)
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Refl: REV S22 (B/R)
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG IN Aux Input
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CONVERSION [ ] provides access to the conversion menu.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INPUT PORTS provides access to the input ports menu.
Analog In Menu
This menu allows you to monitor voltage and frequency nodes , using the analog bus and
internal counter . F or more information, refer to Chapter 10, \Service Key Menus and Error
Messages" in the HP 8753D Network Analyzer Service Guide .
Conversion Menu
This menu converts the measured reection or transmission data to the equivalent complex
impedance (Z) or admittance (Y) values . This is not the same as a two-port Y or Z parameter
conversion, as only the measured parameter is used in the equations . Two simple one-port
conversions are available , depending on the measurement conguration.
An S
11
or S
22
trace measured as reection can be converted to equivalent parallel impedance or
admittance using the model and equations shown in Figure 6-9.
Application and Operation Concepts 6-27