The FOUR PORT CAL Setup menu and its related dialog boxes is used to set the calibration parameters for the four port calibration.
FOUR PORT CAL Menu - 4-Port VNAs
Button Availability
• The exact composition of the menu depends on the settings made on the CAL SETUP, CAL METHOD, and LINE TYPE menus and on the resultant FULL FOUR PORT CAL SETUP dialog box.
• A representative menu is shown below.
• The example procedures at the end of this chapter show examples of various FOUR PORT CAL menus.
• MAIN | Calibration | CALIBRATION | Calibrate | CALIBRATE | Manual Cal | MANUAL CAL | 4-Port Cal | FOUR PORT CAL
FOUR PORT CAL Menu - 4-Port VNAs - Typical Example
Modify Cal Setup
Select displays the CAL SETUP menu where the Edit Cal Params button provides access to the FULL FOUR PORT CAL SETUP dialog box for the selected calibration method and line type.
Read-only display of the ports selected for the pending calibration.
Completion Menu Buttons
For this example menu, the Port 1 Reflective Devices to the Isolation (Optional) buttons link to completion submenus where additional calibration procedures are performed.
For example, the Port 1 Reflective Devices button (shown below at #1) links to the REFL. DEVICES PORT 1 submenu. As each procedure is completed, the submenu button is marked with a completion checkmark. When all the procedures on the submenu are completed, use the Back button to return to the FOUR PORT CAL menu.
The Port 1 Reflective Devices button (shown above at #2) is now marked with a completion checkmark.
Port 1 Reflective Devices
Select displays the REFL. DEVICES PORT 1 submenu. When all procedures are complete, select the Back button to return to the FOUR PORT CAL menu where this button is now marked with a completion checkmark.
Port 2 Reflective Devices
Select displays the REFL. DEVICES PORT 2 submenu. When all procedures are complete, select the Back button to return to the FOUR PORT CAL menu where this button is now marked with a completion checkmark.
Port 3 Reflective Devices
Select displays the REFL. DEVICES PORT 3 submenu. When all procedures are complete, select the Back button to return to the FOUR PORT CAL menu where this button is now marked with a completion checkmark.
Port 4 Reflective Devices
Select displays the REFL. DEVICES PORT 3 submenu. When all procedures are complete, select the Back button to return to the FOUR PORT CAL menu where this button is now marked with a completion checkmark.
Thru/Recip
Select displays the THRU/RECIP submenu. When all procedures are complete, select the Back button to return to the FOUR PORT CAL menu where this button is now marked with a completion checkmark.
Isolation (Optional)
If required, select displays the ISOLATION submenu. When all procedures are complete, select the Back button to return to the FOUR PORT CAL menu where this button is now marked with a completion checkmark.
Done
This button is unavailable until a successful calibration procedure has been completed. When available, it returns to the CALIBRATION menu where the Cal Status button is set to ON.
Manual 4-Port Cal Setup Dialog Boxes - 4-Port VNAs
The instrument supports all combinations of 4-port calibration method and line types with configuration dialog boxes. In the interest of document length, not all combinations are described in detail. However, all combinations are summarized in the table at the end of this section.
• MAIN | Calibration | CALIBRATION | Calibrate | CALIBRATE | Manual Cal | MANUAL CAL | 4-Port Cal | FOUR PORT CAL | Modify Cal Setup | CAL SETUP | Cal Method = SOLT/SOLR | Line Type = Coaxial | Edit Cal Params | FULL FOUR PORT CAL SETUP (SOLT/R, COAXIAL) Dialog Box
FULL FOUR PORT CAL SETUP (SOLT/R, COAXIAL) Dialog Box
Reference Impedance
Input the reference impedance.
• Input field defaulted to 50 Ohms.
• Any numerical value accepted although input values <0.01 Ohms are converted to 0.01 Ohms.
Select Through Area
Select any combination of throughs as long as three are selected. For a 4-port calibration, the following port pairs are available:
• Thru 1-2
• Thru 1-3
• Thru 1-4
• Thru 2-3
• Thru 2-4
• Thru 3.4
Thru Buttons
Each of the throughs above enables a Thru Info button that displays the THRU INFO dialog box allowing configuration of each through. A calculator icon in the THRU INFO dialog box allows access to the AIR EQUIVALENT LENGTH CALCULATOR dialog box.
• Sliding Load. If Sliding Load is selected, a message appears in the “Still requires broadband loads below sliding load breakpoint frequency.”
Test Port 1 Connector Type Area
Select the DUT Connector Type from a drop-down menu list with options of:
• 0.8 mm Conn (M)
• 0.8 mm Conn (F)
• W1-Conn (M)
• W1-Conn (F)
• V-Conn (M)
• V-Conn (F)
• K-Conn (M)
• K-Conn (F)
• GPC-3.5 (M)
• GPC-3.5 (F)
• SMA (M)
• SMA (F)
• N-Conn (M)
• N-Conn (F)
• N-Conn (75) (M)
• N-Conn (75) (F)
• GPC-7
• 7/16 (M)
• 7/16 (F)
• TNC (M)
• TNC (F)
• User-Defined1 (M) through User-Defined32 (M)
• User-Defined1 (F) through User-Defined32 (F)
Test Port 1 Connector Standard Info Button
Select displays the Standard Info dialog box for the selected connector and calibration method that displays the connector calibration coefficients. The dialog box contents depend on the selected connector, Cal Method, and Line Type. The example here shows a typical standard information dialog box.
Test Port 2, Test Port 3, and Test Port 4 Connector Type Area
Identical function as with the Test Port 1 Connector Area above. Select the DUT Connector Type from a drop-down menu list.
Test Port 2, Test Port 3, and Test Port 4 Connector Standard Info Button
Identical function as with the Test Port 1 Connector Standard Info Button above. Select displays the Standard Info dialog box for the selected DUT Connector.
Test Port 2, Test Port 3, and Test Port 4 Select BB Load Area
Identical function as with the Test Port 1 Select BB Load Area above. Select between Load 1 and Load 2.
OK / Cancel
Click OK to accept the changes and return to the CAL SETUP menu.
Click Cancel to abandon any changes and return to the CAL SETUP menu.
FULL FOUR PORT CAL SETUP (SSLT, COAXIAL) Dialog Box
• MAIN | Calibration | CALIBRATION | Calibrate | CALIBRATE | Manual Cal | MANUAL CAL | 4-Port Cal | FOUR PORT CAL | Modify Cal Setup | CAL SETUP | Cal Method = SSLT | Line Type = Coaxial | Edit Cal Params | FULL FOUR PORT CAL SETUP (SSLT, COAXIAL) Dialog Box
FULL FOUR PORT CAL SETUP (SSLT, COAXIAL) Dialog Box
Reference Impedance
Input the reference impedance.
• Input field defaulted to 50 Ohms.
• Any numerical value accepted although input values <0.01 Ohms are converted to 0.01 Ohms.
Select Throughs
Select any combination of throughs as long as three are selected. For a 4-port calibration, the following port pairs are available:
• Thru 1-2
• Thru 1-3
• Thru 1-4
• Thru 2-3
• Thru 2-4
• Thru 3.4
Thru Buttons
Each of the throughs above enables a Thru Info button that displays the THRU INFO dialog box allowing configuration of each through. A calculator icon in the THRU INFO dialog box allows access to the AIR EQUIVALENT LENGTH CALCULATOR dialog box.
• Sliding Load. If Sliding Load is selected, a message appears in the “Still requires broadband loads below sliding load breakpoint frequency.”
Test Port 1 Connector Type
Select the DUT Connector Type from a drop-down menu list with options of:
• 0.8 mm Conn (M)
• 0.8 mm Conn (F)
• W1-Conn (M)
• W1-Conn (F)
• User-Defined1 (M) through User-Defined32 (M)
• User-Defined1 (F) through User-Defined32 (F)
Test Port 1 Connector Standard Info Button
Select displays the Standard Info dialog box for the selected connector and calibration method that displays the connector calibration coefficients. The dialog box contents depend on the selected connector, Cal Method, and Line Type. The example here shows a typical standard information dialog box.
Test Port 2, Test Port 3, and Test Port 4 Connector Type
Identical function as with the Test Port 1 Connector above. Select the DUT Connector Type from a drop-down menu list.
Test Port 2, Test Port 3, and Test Port 4 Connector Standard Info Button
Identical function as with the Test Port 1 Connector Standard Info Button above. Select displays the Standard Info dialog box for the selected DUT Connector.
Test Port 2, Test Port 3, and Test Port 4 Select BB Load
Identical function as with the Test Port 1 Select BB Load above. Select between Load 1 and Load 2.
OK / Cancel
Click OK to accept the changes and return to the CAL SETUP menu.
Click Cancel to abandon any changes and return to the CAL SETUP menu.
FULL FOUR PORT CAL SETUP (SSST, COAXIAL) Dialog Box
• This dialog box is available from multiple menus.
• MAIN | Calibration | CALIBRATION | Calibrate | CALIBRATE | Manual Cal | MANUAL CAL | 4-Port Cal | FOUR PORT CAL | Modify Cal Setup | CAL SETUP | Cal Method = SSST | Line Type = Coaxial | Edit Cal Params | FULL FOUR PORT CAL SETUP (SSST, COAXIAL) Dialog Box
FULL FOUR PORT CAL SETUP (SSST, COAXIAL) Dialog Box
Reference Impedance
Input the reference impedance.
• Input field defaulted to 50 Ohms.
• Any numerical value accepted although input values <0.01 Ohms are converted to 0.01 Ohms.
Select Throughs
Select any combination of throughs as long as three are selected. For a 4-port calibration, the following port pairs are available:
• Thru 1-2
• Thru 1-3
• Thru 1-4
• Thru 2-3
• Thru 2-4
• Thru 3.4
Thru Info Buttons
Each of the throughs above enables a Thru Info button that displays the THRU INFO dialog box allowing configuration of each through. A calculator icon in the THRU INFO dialog box allows access to the AIR EQUIVALENT LENGTH CALCULATOR dialog box.
Select the DUT Connector Type from a drop-down menu list with options of:
• 0.8 mm Conn (M)
• 0.8 mm Conn (F)
• W1-Conn (M)
• W1-Conn (F)
• User-Defined1 (M) through User-Defined32 (M)
• User-Defined1 (F) through User-Defined32 (F)
Test Port 1 Connector Standard Info Button
Select displays the Standard Info dialog box for the selected connector and calibration method that displays the connector calibration coefficients. The dialog box contents depend on the selected connector, Cal Method, and Line Type. The example here shows a typical standard information dialog box.
Test Port 2, Test Port 3, and Test Port 4 Connector Type
Identical function as with the Test Port 1 Connector above. Select the DUT Connector Type from a drop-down menu list.
Test Port 2, Test Port 3, and Test Port 4 Connector Standard Info Button
Identical function as with the Test Port 1 Connector Standard Info Button above. Select displays the Standard Info dialog box for the selected DUT Connector.
OK / Cancel
Click OK to accept the changes and return to the CAL SETUP menu.
Click Cancel to abandon any changes and return to the CAL SETUP menu.
FULL FOUR PORT CAL SETUP (SSST, WAVEGUIDE) Dialog Box
• This dialog box is available from multiple menus.
• MAIN | Calibration | CALIBRATION | Calibrate | CALIBRATE | Manual Cal | MANUAL CAL | 4-Port Cal | FOUR PORT CAL | Modify Cal Setup | CAL SETUP | Cal Method = SSST | Line Type = Waveguide | Edit Cal Params | FULL FOUR PORT CAL SETUP (SSST, WAVEGUIDE) Dialog Box
FULL FOUR PORT CAL SETUP (SSST, WAVEGUIDE) Dialog Box
Reference Impedance
Input the reference impedance.
• Input field defaulted to 50 Ohms.
• Any numerical value accepted although input values <0.01 Ohms are converted to 0.01 Ohms.
Waveguide Kit
Select the Waveguide Kit from a drop-down menu list with options of:
• User-Defined1 through User-Defined32
Select Throughs
Select any combination of throughs as long as three are selected that connect to all ports. For a 4-port calibration, the following port pairs are available:
• Thru 1-2
• Thru 1-3
• Thru 1-4
• Thru 2-3
• Thru 2-4
• Thru 3.4
Thru Buttons
As each through is selected, it enables a Thru Info button that displays the THRU INFO configuration dialog box for the selected port pair. A calculator icon in the THRU INFO dialog box allows access to the AIR EQUIVALENT LENGTH CALCULATOR dialog box.
• MAIN | Calibration | CALIBRATION | Calibrate | CALIBRATE | Manual Cal | MANUAL CAL | 4-Port Cal | FOUR PORT CAL | Modify Cal Setup | CAL SETUP | Cal Method = LRL/LRM | Line Type = Coaxial | Edit Cal Params | FULL FOUR PORT CAL SETUP (LRL/LRM, COAXIAL) Dialog Box
FOUR PORT CAL SETUP (LRL/LRM, COAXIAL) Dialog Box
Overview
The dialog box provides common areas for Reference Impedance, Full Four Port Calibration Configuration, and Thru Selection. Below this common section are two tabbed dialog areas for Cal A and Cal B.
Reference Impedance
Input the reference impedance.
• Input field defaulted to 50 Ohms.
• Any numerical value accepted although input values <0.01 Ohms are converted to 0.01 Ohms.
Full Four Port Cal Configuration
Requires two 2-port calibrations as Cal A and Cal B, configured below.
Cal A Ports
Allows selection of the calibration A port pair. Combinations of ports 1-2 and ports 3-4 are not allowed. Select from:
• Port 1, 3
• Port 1, 4
• Port 2, 3
• Port 2, 4
Cal B Ports
This area is read-only and defined by the port pair choice for Cal A.
• If Cal A = Ports 1, 3, then Cal B = Ports 2, 4
• If Cal A = Ports 1, 4, then Cal B = Ports 2, 3
• If Cal A = Ports 2, 3, then Cal B = Ports 1, 4
• If Cal A = Ports 2, 4, then Cal B = Ports 1, 3
Thru Selection
Any combination of throughs may be selected as long as least one additional through is selected from:
• Thru 1-2
• Thru 1-3
• Thru 1-4
• Thru 3-4
Cal A Tab
Access the Cal A functions and controls by selecting the Cal A tab.
Cal A - Reference Plane Location
Select from two radio button controlled options:
• Ends of Line 1
• Middle of Line 1
Cal A - Band Definition
Select one or two bands from the pull-down menu.
• Number of Bands = 1. Only the Band 1 Definition area is present.
• Number of Bands = 2. The Band 1 Definition area remains, and the Band 2 Definition and the Band Break Point areas appear.
Cal A - Band 1 Device 1 Definition
Provides the following fields and controls for Band 1:
• Band 1 Device 1 = Defaulted to Line.
• Line Length (mm) for Device 1. Allows input of the line length in mm.
• Line Loss (dB/mm). Allows input of a line loss in dB per mm at the frequency specified in the field below.
• @ Frequency (GHz). Allows input of a frequency setting for the Line Loss factor input above.
Cal A - Band 1 Device 2 Definition
• Band 1 Device 2. Select from Line or Match in pull-down menu.
• If Line is selected, the Type of Reflection allows selection of Use Open-like component or Use Short-like component.
• If Use Open-line component is selected, the Reflection Component area at bottom of dialog box displays the Open-like Offset Length (mm) field.
• If Use Short-like component is selected, the Reflection Component area at bottom of dialog box displays Short-line Offset Length (mm) field.
Cal A - Band 2 Definition
The Number of Bands field above must be set to “2” for this area and the Band Break Point area described below to be displayed. Provides the following fields and controls for Band 2.
Cal A - Band 2 Device 3 Definition
A pull-down menu with selections of:
• Use device 1
• Use device 2
• Use new line. If selected, additional fields appear as Line Length (mm), Line Loss (dB/mm), and @ Frequency (GHz).
Cal A - Band 2 Device 4 Definition
A pull-down menu with selections of:
• Line
• Match
If Line is selected for Band 2 Device 4, the Type of Reflection and Line Length (mm) fields are available.
The Type of Reflection field choices are limited to:
• Use Short-like component. If selected, the Reflection Component area below has one field for Short-like Offset Length (mm).
• Use Open-like component. If selected, the Reflection Component area below has two fields of Open-like Offset Length (mm) and Short-like Offset Length (mm).
If Match is selected for Band 2 Device 4, the Match Info button and the Type of Reflection fields appear with choices of:
• The Match Info button appears. Select displays the USER DEFINED MATCH DEVICES dialog box appears which allows configuration of the match devices.
• The Type of Reflection field has the following choices:
• Use Short-like component. If selected, the Reflection Component area below has one field of Short-like Offset Length (mm) field.
• Use Open-like component. If selected, the Reflection Component area below has two fields of Open-like Offset Length (mm) and Short-like Offset Length (mm).
• Use both. If selected, pair of radio button fields appear and allow selection of either Use Port 1 Match or Use Port 2 Match. Also, if selected, the Reflection Component area below has two fields of Open-like Offset Length (mm) and Short-like Offset Length (mm).
Cal A - Band Break Point
This area only appears if the Number of Bands in the Band Definition area is set to “2”.
The Calculate Recommended Value button calculates the recommended break point value based on the input parameters in the fields above. Clicking the button calculates a break point frequency value and populates the Use Recommended Frequency (GHz) field.
A radio button set allows selection of either:
• Use Recommended Frequency (GHz) which was calculated by the button above.
• Define New Frequency (GHz) field which allows direct user input of a break frequency value.
Cal A - Reflection Component
Depending on the settings in the fields above, this area one or two input fields from:
• Open-like Offset Length (mm)
• Short-like Offset Length (mm)
Cal B Tab and Controls
Access the Cal B functions and controls by selecting the Cal B tab.
Cal B - Reference Plane Location
Select from two radio button controlled options:
• Ends of Line 1
• Middle of Line 1
Cal B - Band Definition
Select one or two bands from the pull-down menu. The function is the same as the Cal A - Band Definition described above.
Cal B - Band 1 Device 1 Definition
Provides fields and controls for Cal B - Band 1 Device 1. The functions are the same as the Cal B - Band 1 Device 1 Definition area described above.
Cal B - Band 1 Device 2 Definition
Provides fields and controls for Cal B - Band 1 Device 2. The functions are the same as the Cal A - Band 1 Device 2 Definition area described above.
Cal B - Band 2 Definition
The Number of Bands field above must be set to “2” for this area and the Band Break Point area described below to be displayed. The functions are the same as the Cal B - Band 2 Definition area described above.
Cal B - Band 2 Device 3 Definition
A pull-down menu with selections of Use device 1, Use device 2, or Use new line. The functions and controls are the same as the Cal A - Band 2 Device 3 Definition area described above.
Cal B - Band 2 Device 4 Definition
A pull-down menu with selections of Line or Match. The functions and controls are the same as the Cal A - Band 2 Device 4 Definition area described above.
Cal B - Band Break Point
This area only appears if the Number of Bands in the Band Definition area is set to “2”. The functions and controls are the same as the Cal A - Band Break Point area described above.
Cal B - Reflection Component
Depending on the settings in the fields above, this area has one or two input fields. The functions and controls are the same as the Cal A - Reflection Component area described above.
OK / Cancel
Click OK to accept the changes and return to the CAL SETUP menu.
Click Cancel to abandon any changes and return to the CAL SETUP menu.
Manual 4-Port Cal Dialog Box Summary
The table below summarizes the available fields in all available 4-port calibration setup dialog boxes. If the dialog box is described above, a link is provided to that description. To view each dialog box, set the CAL METHOD and LINE TYPE menus to the appropriate settings, and then select the Edit Cal Params button. All dialog boxes are named either “Full Four Port Cal Setup (Cal Method, Line Type)” or “Four Port Cal Setup (Cal Method, Line Type)
Select Throughs: At least 3 throughs that connect to all ports must be selected. Select from Thru 1-2, Thru 1-3, Thru 1-4, Thru 2-3, Thru 2-4, Thru 3-4.
Thru Info buttons: Displays the THRU INFO dialog box for the selected through.
Load Type: Select from Broadband Load or Sliding Load
Test Ports: Port 1, Port 2, Port 3, Port 4.
Test Port DUT Connector: For each selected test port, select one of the following connectors: 0.8 mm Conn (M), 0.8 mm Conn (F), W1-Conn (M), W1-Conn (F), V-Conn (M), V-Conn (F), K-Conn (M), K-Conn (F), 2.4 mm (M), 2.4 mm (F), 2.4 mm V (M), 2.4 mm V (F), GPC-3.5 (M), GPC-3.5 (F), SMA (M), SMA (F), N-Conn (M), N-Conn (F), N-Conn (75) (M), N-Conn (75) (F), GPC-7, 7/16 (M), 7/16 (F), TNC (M), TNC (F), User-Defined1 (M) through User-Defined32 (M), User-Defined1 (F) through User-Defined32 (F)
Test Port Connector Standard Info Button: For each DUT port connector, displays the STANDARD INFORMATION or USER-DEFINED dialog box for the selected connector.
Test Port 1 DUT Connector: 0.8 mm Conn (M), 0.8 mm Conn (F), W1-Conn (M), W1-Conn (F), User-Defined1 (M) through User-Defined32 (M), User-Defined1 (F) through User-Defined32 (F)
Test Port 1 Connector Standard Info Button:
• Displays the STANDARD INFORMATION dialog box for the selected connector.
Select Throughs: At least 3 throughs that connect to all ports must be selected. Select from Thru 1-2, Thru 1-3, Thru 1-4, Thru 2-3, Thru 2-4, Thru 3-4
Thru Info buttons: Displays the THRU INFO dialog box for the selected through.
Test Port DUT Connector: 0.8 mm Conn (M), 0.8 mm Conn (F), W1-Conn (M), W1-Conn (F), User-Defined1 (M) through User-Defined32 (M), User-Defined1 (F) through User-Defined32 (F)
Test Port Connector Standard Info Button: Displays the STANDARD INFORMATION dialog box for the selected connector.
Cal A and Cal B tabs: The “A” and “B” calibration parameters are selected via a tabbed menu within the dialog box.
Number of Bands: 1, 2
• If 1, only Band 1 Device 1 and Band 1 Device 2 controls appear.
• If 2, the above plus Band 2 Device 3 and Band 2 Device 4 controls appear.
Cal A Configuration Parameters:
• Cal A Reference Plane Location: Ends of Line, Middle of Line 1
• Cal A Number of Bands: 1 or 2
• Cal A Band 1 Device 1 Line: Line Length (mm), Line Loss (dB/mm), @ Frequency (GHz)
• Cal A Band 1 Device 2 Type: Line, Match; Use Short-like component, Use Open-like component, Use both; If Device 2 = Match, Match Info button displays USER DEFINED MATCH DEVICES dialog box for selected calibration kit.
