Anritsu VectorStar MN469 C Series, Maintenance Manual, Page: 36 / 78

3-6 Directivity and Test Port Match Verification Chapter 3 — Performance Verification
3-16 PN: 10410-00730 Rev. D MN469xC Series Multiport Test Set MM
• For ripple with a negative trough:
Directivity = Return Loss value

|Mkr 2 value|

|Ref

X value|
• For ripple with a positive peak:
Directivity = Return Loss value

|Mkr 2 value|

|Ref

X value|
• Example:
Directivity = 20 dB + 17.452 dB - 0.9151 dB = 36.5369 dB
84. Record the directivity value into the Port 1 Measured column of the following applicable table in
Appendix A :
• Table A-1, “Directivity Record for MN4694C Multiport VNA System” on page A-2 for MN4694C
• Table A-3, “Directivity Record for MN4697C Multiport VNA System” on page A-4 for MN4697C.
85. Repeat Step 77 to Step 84 for other frequency bands listed in Table A-1 for MN4694C or Table A-3 for
MN4697C in Appendix A .
86. Disconnect the Offset Termination from the Air Line and connect a short.
87. Select
Scale
|
Auto Scale Active Trace
88. Repeat Step 77 to Step 81 . Record the Return Loss value into the appropriate table and the Port 1
Measured column in Appendix A :
• Table A-2, “Test Port Match Record for MN4694C Multiport VNA System” on page A-3 for
MN4694C
• Table A-4, “Test Port Match Record for MN4697C Multiport VNA System” on page A-5 for
MN4697C.
89. Repeat Step 88 for other frequency bands listed in Table A-2 for MN4694C or Table A-4 for MN4697C in
Appendix A .
90. Disconnect the Short from the Air Line and then disconnect the Air Line from the Test Port.
91. Select
Trace
|
Trace Next
92. Connect the Air Line to the next Test Port (e.g. Port 2 for S22, Port 3 for S33 or Port 4 for S44) on
MN469xC and then terminate the Air Line with the Offset Termination.
93. Repeat Step 74 to Step 90 to verify the Directivity and Port Match of the Test Port being tested.
94. Repeat Step 91 to Step 93 for the rest of the Test Ports on MN469xC.