Dynamic Uncertainty

Dim app

' Create / Get the VNA application.

Set pna = CreateObject("AgilentPNA835x.Application")

'Preset the analyzer

pna.preset

SetupWorkspace

TwoPortGuidedCal

PerformCableChar

PerformNoiseChar

TwoPortUncertCal

MakeTraceSettings

MsgBox "The example program has now completed"

'*********************************************

' Setup Uncertainty Workspace

Sub SetupWorkspace

Set cables = pna.UncertaintyManager.Cables

Dim strCableCatalog

For i = 1 To cables.Count

    strCableCatalog = strCableCatalog & cables(i).Name

    If i < cables.Count Then strCableCatalog = strCableCatalog & Chr(10)

   ' Uncomment the following line to reset (clear) repeatability data for the cable

   'cables(i).ResetRepeatability

Next

MsgBox "Cables:" & Chr(10) & Chr(10) & strCableCatalog

Set ports = pna.UncertaintyManager.Ports

Dim strPortCatalog

For i = 1 To ports.Count

    strPortCatalog = strPortCatalog & "Port " & ports(i).Number & ": " & ports(i).Cable

    If i < ports.Count Then strPortCatalog = strPortCatalog & Chr(10)

   ' Uncomment the following line to reset (clear) noise data for the port

   'ports(i).ResetNoise

Next

MsgBox "Port Cables:" & Chr(10) & Chr(10) & strPortCatalog

' Uncomment the following line to select the particular cable for all ports

'ports.SelectCableForAllPorts cables(1).Name

' Uncomment this next line to copy the noise data for Port 1 to be used for all ports

'ports.CopyNoiseToAllPorts 1

' Uncomment the following line to reset (clear) the noise data for all ports

'ports.ResetNoiseForAllPorts

' The next lines toggle uncertainty manager properties on

pna.UncertaintyManager.PortNoiseEnabled = True

MsgBox "Noise enabled for cals = " & pna.UncertaintyManager.PortNoiseEnabled

pna.UncertaintyManager.CableRepeatabilityEnabled = True

MsgBox "Cable repeatability enabled for cals = " & pna.UncertaintyManager.CableRepeatabilityEnabled

pna.UncertaintyManager.StandardDefinitionsEnabled = True

MsgBox "Standards definition uncertainties enabled for cals = " & pna.UncertaintyManager.StandardDefinitionsEnabled

' Uncomment the following line to change the max number of uncertainty points for cals to be 500

'pna.UncertaintyManager.MaximumUncertaintyPoints = 500

MsgBox "Max number of uncertainty points for cals = " & pna.UncertaintyManager.MaximumUncertaintyPoints

' Uncomment the following line to perform a Save of the currently loaded uncertainty workspace ('.ml4') file

'pna.UncertaintyManager.Save

' Uncomment the following line to save the currently loaded uncertainty workspace to a specific ('.ml4') filename

'pna.UncertaintyManager.Save "myUncertaintyWorkspace.ml4"

' Uncomment the following line to recall the uncertainty workspace ('.ml4') file that we just saved

'pna.UncertaintyManager.Recall "myUncertaintyWorkspace.ml4"

End Sub

'*********************************************

' Measure the steps of a cable characterization,

' noise characterization, or a calibration.

Sub MeasureStepsOfCharacterizationOrCal(objCharOrCal, isNoiseCharacterization, numSteps)

For i = 1 To numSteps

    step = "Step " + CStr(i) + " of " + CStr(numSteps)

    ' A "connection adjustment" means the user has to change something about the connection,

    ' such as wiggling cable and re-connecting standard during a repeatability characterization,

    ' or to move the slide position of a sliding load if a connection step in a calibration

    ' were to involve a sliding load.

    If isNoiseCharacterization = False Then

        numConnectionAdjustmentsPerStep = objCharOrCal.MinimumIterationsForStep(i)

    Else ' noise characterization

        ' in this case, "iterations" are just repetitive measurements, not re-adjust/re-measure the standard

        numConnectionAdjustmentsPerStep = 1

    End If

    For j = 1 To numConnectionAdjustmentsPerStep

        strPrompt = objCharOrCal.GetStepDescription(i)

        retVal = MsgBox(strPrompt, vbOKCancel, step)

        If retVal = vbCancel Then WScript.Quit

        objCharOrCal.AcquireStep i

    Next

Next

objCharOrCal.GenerateErrorTerms

End Sub

Function FormatList(tokens)

   For i = 0 To UBound(tokens)

     list = list & tokens(i) & Chr(10)

   Next

   FormatList = list

End Function

'*********************************************

' Performing a NON-UNCERTAINTY Guided 2-port cal (Ports 1 and 2)

Sub TwoPortGuidedCal

message = "A non-uncertainty 2-port calibration will now be performed, "

message = message & "because a calibration is needed for characterizing the cables"

MsgBox message

' Create / Get the VNA application.

Set app = CreateObject("AgilentPNA835x.Application")

Set calMgr = app.GetCalManager

Set guidedCal = calMgr.GuidedCalibration

Set chan = app.ActiveChannel

chanNum = chan.ChannelNumber

' Initialize guided cal to be performed on the active channel.

' The boolean argument of True indicates to create a new calset

' for storing the new calibration to.

guidedCal.Initialize chanNum, True

' Query the connectors that the VNA system recognizes

conns = guidedCal.ValidConnectorTypes

' Format the list string with linefeed characters between each substring

connList = FormatList(conns)

' Select the connector for Port 1

selectedConn1 = InputBox("Enter your DUT connector for Port 1.  Choose from this list:" & _

                        Chr(10) & Chr(10) & connList)

If selectedConn1 = "" Then Exit Sub

guidedCal.ConnectorType(1) = selectedConn1

' Select the connector for Port 2

selectedConn2 = InputBox("Enter your DUT connector for Port 2.  Again, choose from this list:" & _

                        Chr(10) & Chr(10) & connList)

If selectedConn2 = "" Then Exit Sub

guidedCal.ConnectorType(2) = selectedConn2

' Note: If your VNA has more than 2 ports, you would need to uncomment

' one or both of these next two lines, to explicitly specify this is

' just a 2-port cal.

'guidedCal.ConnectorType(3) = "Not used"

'guidedCal.ConnectorType(4) = "Not used"

' Query the list of acceptable cal kits and ECal module characterizations for Port 1.

kits = guidedCal.GetCompatibleCalKits(selectedConn1)

' Format the list string with linefeed characters between each substring

kitList = FormatList(kits)

' Select the Cal Kit or ECal module characterization to use for Port 1.

selectedKit = InputBox("Enter your cal kit or ECal module characterization for Port 1.  " & _

                       "Choose from this list:" & Chr(10) & Chr(10) & kitList)

If selectedKit = "" Then Exit Sub

guidedCal.CalKitType(1) = selectedKit

' Query the list of acceptable cal kits and ECal module characterizations for Port 2.

kits = guidedCal.GetCompatibleCalKits(selectedConn2)

' Format the list string with linefeed characters between each substring

kitList = FormatList(kits)

' Select the Cal Kit or ECal module characterization to use for Port 2.

selectedKit = InputBox("Enter your cal kit or ECal module characterization for Port 2.  " & _

                       "Choose from this list:" & Chr(10) & Chr(10) & kitList)

If selectedKit = "" Then Exit Sub

guidedCal.CalKitType(2) = selectedKit

' This determines whether the cal will be a "Guided Power Cal"

' or just a traditional S-parameter cal.

message = "On which port number shall power be measured?  "

message = message & "For a traditional guided cal without power cal, enter 0"

Dim powerPort

powerPort = CInt( InputBox(message) )

If powerPort > 0 Then

   guidedCal.PerformPowerCalibration(powerPort) = True

   Dim retVal

   retVal = MsgBox("Is the power sensor's connector type or gender different from the DUT connector for that port?", vbYesNo)

   If retVal = vbYes Then

      message = "Enter your power sensor's connector.  Choose from this list:"

      message = message & Chr(10) & Chr(10) & connList

      ' Select the sensor's connector.

      selectedConn1 = InputBox(message)

      If selectedConn1 = "" Then Exit Sub

      guidedCal.PowerSensorConnectorType(powerPort) = selectedConn1

      ' Query the list of acceptable cal kits and ECal module characterizations

      ' that are applicable for the sensor's connector.

      kits = guidedCal.GetCompatibleCalKits(selectedConn1)

      ' Format the list string with linefeed characters between each substring

      kitList = FormatList(kits)

      message = "Enter your cal kit or ECal module characterization to use for de-embed of the sensor's connector.  "

      message = message & "Choose from this list:"

      message = message & Chr(10) & Chr(10) & kitList

      ' Select the Cal Kit or ECal module characterization to use for de-embed of the sensor's connector.

      selectedKit = InputBox(message)

      If selectedKit = "" Then Exit Sub

      guidedCal.PowerSensorCalkitType(powerPort) = selectedKit

   Else

      guidedCal.PowerSensorConnectorType(powerPort) = "Ignored"

   End If ' End of block that considers the sensor's connector

   ' Ask for the power level to perform the power cal at

   ' (if this command is omitted, the default is 0 dBm).

   Dim powerLevel

   powerLevel = InputBox("Enter the power level for the power cal to be performed at")

   If powerLevel = "" Then Exit Sub

   guidedCal.PowerCalibrationPowerLevel(powerPort) = CDbl(powerLevel)

Else

   guidedCal.PerformPowerCalibration(1) = False

End If ' End of block that considers if the cal will include power calibration

'-----------------------------------------------------------------------------------

' This next block of commented-out code shows optional functions when using ECal.

' These OrientECALModule and ECALPortMapEx properties would need to be set prior to  

' calling GenerateSteps on the guidedCal object.

' Read the information about the Keysight factory characterization data

' of ECal module #1 on the USB bus

'Set calibrator = chan.Calibrator

'Const ECalModule1 = 1

'module1Info = calibrator.GetECALModuleInfoEx(ECalModule1)

'MsgBox "Description of ECal module #1:" & Chr(10) & Chr(10) & module1Info

' By default, during calibration the VNA automatically determines the orientation of

' the ECal module (senses which port of the module is connected to which port of the VNA).

' However, since this setting could have recently been overridden by another user of

' the instrument, use this next line to ensure the auto orientation setting is enabled.

'calibrator.OrientECALModule = True

' Alternatively, if you are measuring at very low power levels where

' the VNA fails to sense the module's orientation, you may need to turn off the auto

' orientation and specify how the module is connected (as in these next two lines of code,

' "A1,B2" would indicate Port A of the module is connected to Port 1 and

' Port B is connected to Port 2).

'calibrator.OrientECALModule = False

'calibrator.ECALPortMapEx(ECalModule1) = "A1,B2"

' End of optional ECal setup

'-----------------------------------------------------------------------------------

' Select the thru method of Default.  This instructs the VNA to determine which thru

' standard measurement technique to use, based upon the selected connectors and

' calibration kit(s) and what model of VNA this is.

guidedCal.ThruCalMethod = 0 ' 0 = naDefaultCalMethod

' Initiate the calibration and query the number of steps

numCalSteps = guidedCal.GenerateSteps

MsgBox "Number of steps is " + CStr(numCalSteps)

 ' Measure the standards

MeasureStepsOfCharacterizationOrCal guidedCal, False, numCalSteps

MsgBox "The cal needed for the cable repeatability characterizations is done"

End Sub

'*********************************************

' Perform Cable Characterization

Sub PerformCableChar

pna.ActiveMeasurement.ErrorCorrection = True

Set uncchar = pna.UncertaintyManager.Characterizer

' Initiate repeatability characterizations on Channel 1 for Ports 1 and 2, with 3

' iterative measurements of each standard (normally users should specify more than 3

' iterations per standard but it just makes this example speedier)

numCharSteps = uncchar.InitiateCableCharacterization(1, 1, 3)

message = "Now to characterize the cable currently associated with port 1.  "

message = message & "Number of standard steps for characterizing port 1 cable = " & numCharSteps

MsgBox message  

' Get guided cal object for Channel 1 to use for performing the characterization

Set guidedcal = uncchar.GuidedCalibration(1)

MeasureStepsOfCharacterizationOrCal guidedcal, False, numCharSteps

MsgBox "Cable characterization for port 1 is done"

numCharSteps = uncchar.InitiateCableCharacterization(1, 2, 3)

message = "Now to characterize the cable currently associated with port 2.  "

message = message & "Number of standard steps for characterizing port 2 cable = " & numCharSteps

MsgBox message  

Set guidedcal = uncchar.GuidedCalibration(1)

MeasureStepsOfCharacterizationOrCal guidedcal, False, numCharSteps

MsgBox "Cable characterization for port 2 is done"

End Sub

'*********************************************

'Perform Noise Characterization

Sub PerformNoiseChar

pna.ActiveMeasurement.ErrorCorrection = True

Set uncchar = pna.UncertaintyManager.Characterizer

' Initiate noise characterization on Channel 1 for Ports 1 and 2, with 3 iterative

' measurements of each standard (normally users should specify more than 3 iterations

' per standard but it just makes this example speedier)

numCharSteps = uncchar.InitiateNoiseCharacterization(1, 1, 2, 3)

message = "Now to characterize the system noise for ports 1 and 2.  "

message = message & "Number of connection steps to be made = " & numCharSteps

MsgBox message

' Get guided cal object for Channel 1 to use for performing the characterization

Set guidedcal = uncchar.GuidedCalibration(1)

MeasureStepsOfCharacterizationOrCal guidedcal, True, numCharSteps

MsgBox "Noise characterization is done"

End Sub

'*********************************************

'Perform 2-port Uncertainty Calibration (Ports 1 and 2) on Channel 1

Sub TwoPortUncertCal

' Note: normally to use the Application's ActiveChannel property for this,

' you would have to ensure your active channel is an S-parameter channel

' before this point, but as the PerformCableChar and PerformNoiseChar

' subroutines have executed right before this one, that is already ensured.

' Create / Get the VNA application.

Set calMgr = app.GetCalManager

Set guidedCal = calMgr.GuidedCalibration

Set chan = app.ActiveChannel

chanNum = chan.ChannelNumber

' Initialize guided cal to be performed on the active channel.

' The boolean argument of True indicates to create a new calset

' for storing the new calibration to.

guidedCal.Initialize chanNum, True

' Specify this calibration is to be performed with uncertainties.

guidedCal.UncertaintyEnabled = True

' Query the list of uncertainty cal kits and ECal module factory characterizations

' applicable for the connector of the cable associated with Port 1.

kits = guidedCal.CompatibleCalKits(1)

' Format the list string with linefeed characters between each substring

kitList = FormatList(kits)

' Select the Cal Kit or ECal module to use for both ports.

' If the selected kit does not have a suitable set of standards

' that can mate the connector of the cable attached to Port 2,

' then the attempt to GenerateSteps should yield an applicable error message.

message = "Now to perform an uncertainty calibration for ports 1 and 2.  "

message = message & "Enter your cal kit or ECal module to use.  Choose from this list:"

message = message & Chr(10) & Chr(10) & kitList

selectedKit = InputBox(message)

If selectedKit = "" Then Exit Sub

guidedCal.CalKitType(1) = selectedKit

guidedCal.CalKitType(2) = selectedKit

' Note: If your VNA has more than 2 ports, then should uncomment

' one or both of these next two lines just in case this channel

' may have had a remote non-Dolcetto cal performed prior that

' involved port 3 and/or 4.

'guidedCal.CalKitType(3) = ""

'guidedCal.CalKitType(4) = ""

' This next block of commented-out code shows optional functions when using ECal.

' These OrientECALModule and ECALPortMapEx properties would need to be set prior

' to calling GenerateSteps on the guidedCal object.

'-----------------------------------------------------------------------------------

' Read the information about the factory characterization data

' of ECal module #1 on the USB bus

'Set calibrator = chan.Calibrator

'Const ECalModule1 = 1

'module1Info = calibrator.GetECALModuleInfoEx(ECalModule1)

'MsgBox "Description of ECal module #1:" & Chr(10) & Chr(10) & module1Info

' By default, during calibration the VNA automatically determines the orientation

' of the ECal module (senses which port of the module is connected to which port of

' the VNA).  However, since this setting could have recently been overridden by

' another user of the instrument, use this next line to ensure the auto orientation

' setting is enabled.

'calibrator.OrientECALModule = True

' Alternatively, if you are measuring at very low power levels where

' the VNA fails to sense the module's orientation, you may need to turn off the auto

' orientation and specify how the module is connected (as in these next two lines

' of code, "A1,B2" would indicate Port A of the module is connected to Port 1 and

' Port B is connected to Port 2).

'c alibrator.OrientECALModule = False

'calibrator.ECALPortMapEx(ECalModule1) = "A1,B2"

'-----------------------------------------------------------------------------------

' End of optional ECal setup

' Initiate the calibration and query the number of steps

numCalSteps = guidedCal.GenerateSteps

MsgBox "Number of cal steps is " + CStr(numCalSteps)

MeasureStepsOfCharacterizationOrCal guidedCal, False, numCalSteps

MsgBox "Cal is done"

End Sub

'*********************************************

'Make Uncertainty Trace Settings

Sub MakeTraceSettings

' Note: normally to use the Application's ActiveMeasurement property for this,

' you would have to first ensure your active measurement is an S-parameter channel

' measurement before this point, and that the channel has an uncertainty cal to be

' able to turn on uncertainty display, but as the TwoPortUncertCal subroutine has

' executed right before this one, that is already ensured.

Set unc = pna.ActiveMeasurement.Uncertainty

MsgBox "DisplayType = " & GetUncDispEnumValueName(unc.DisplayType)

On Error Resume Next

unc.DisplayType = 4 ' naUncertaintyDisplayShade

If Err.Number <> 0 Then

   MsgBox Err.Description

   Err.Clear

Else

   MsgBox "DisplayType = " & GetUncDispEnumValueName(unc.DisplayType)

End If

On Error GoTo 0

MsgBox "CoverageFactor = " & unc.CoverageFactor

' Uncomment the following line to try setting the CoverageFactor = 3

'unc.CoverageFactor = 3

unc.CableRepeatabilityUncertainty = False

MsgBox "CableRepeatabilityUncertainty = " & unc.CableRepeatabilityUncertainty

unc.CableRepeatabilityUncertainty = True

MsgBox "CableRepeatabilityUncertainty = " & unc.CableRepeatabilityUncertainty

unc.MeasurementNoiseUncertainty = False

MsgBox "MeasurementNoiseUncertainty = " & unc.MeasurementNoiseUncertainty

unc.MeasurementNoiseUncertainty = True

MsgBox "MeasurementNoiseUncertainty = " & unc.MeasurementNoiseUncertainty

unc.ErrorTermUncertainty = False

MsgBox "unc.ErrorTermUncertainty = " & unc.ErrorTermUncertainty

unc.ErrorTermUncertainty = True

MsgBox "unc.ErrorTermUncertainty = " & unc.ErrorTermUncertainty

End Sub

Function GetUncDispEnumValueName(uncDispTypeEnum)

Select Case uncDispTypeEnum

   Case 0

      GetUncDispEnumValueName = "naUncertaintyDisplayNone"

   Case 1

      GetUncDispEnumValueName = "naUncertaintyDisplayMaximum"

   Case 2

      GetUncDispEnumValueName = "naUncertaintyDisplayMinimum"

   Case 3

      GetUncDispEnumValueName = "naUncertaintyDisplayBar"

   Case 4

      GetUncDispEnumValueName = "naUncertaintyDisplayShade"

   Case 5

      GetUncDispEnumValueName = "naUncertaintyDisplayEllipse"

   Case Else

      GetUncDispEnumValueName = "Unexpected display type enum value!"

End Select

End Function