Write-only

About Balanced Measurements

Description

Maps the physical VNA ports to a device of balanced and single-ended logical ports for multi-port systems with greater than 4 ports.

The device type is set using the following commands:

• SetBPort - single balanced port DUT topology.

• SetBBPorts - balanced - balanced DUT topology.

• SetBSPorts - balanced - single-ended DUT topology.

• SetSBPorts - single-ended - balanced DUT topology.

• SetSSBPorts - single-ended - single-ended - balanced DUT topology.

The Parameter command returns the list of parameters available for the currently selected topology.

 VB Syntax

balTopology.SetCustomDUTTopology (portTypeSequence, physicalPortsSequence)

Variable

(Type) - Description

balTopology

A BalancedTopology (object)

portTypeSequence

(String) Device type for the balanced measurement. ‘B’ means the Balanced port; ‘S’ means the Single-ended port. Choose from:

B – 1 port balanced device (2 ports)

BB – Balanced - Balanced device (4 ports)

BS – Balanced - Single-ended device (3 ports)

SB – Single-ended - Balanced device (3 ports)

SSB – Single-ended - Single-ended - Balanced device (4 ports)

physicalPortsSequence

(Variant) Physical port numbers mapped to the logical ports, separated by ‘,’.

‘B’ (Balanced) requires 2 physical port numbers: <nPos>, <nNeg>.

‘S’ (Single-ended) requires 1 physical port number.

Return Type

Not applicable - To read port mappings, use the BalancedTopology properties.

Default

Not Applicable

Examples

'The following example sets up 8 physical ports into 6 logical ports:
'Logical port 1 is a single ended port mapped to physical port 1
'Logical port 2 is a single ended port mapped to physical port 2
'Logical port 3 is a balanced port mapped to physical ports 3 and 4
'Logical port 4 is a single ended port mapped to physical port 5
'Logical port 5 is a single ended port mapped to physical port 6
'Logical port 6 is a balanced port mapped to physical ports 7 and 8

Int portlist[] = {1,2,3,4,5,6,7,8}
balTopology.SetCustomDuTTopology ("SSBSSB", portlist)

C++ Syntax

HRESULT SetCustomDUTTopology(BSTR portTypeSequence, VARIANT physicalPortsSequence)

Interface

IBalancedTopology3