RFmxInstrMXConstants.LOSourceAutomaticSGSAShared Field

Specifies that RFmx automatically configures the signal analyzer to use the LO utilized by the signal generator on the same vector signal transceiver (VST) based on the configured measurements.

When using instruments that do not have LOs with excellent phase noise and to minimize the contribution of the instrument's phase noise affecting your measurements, NI recommends to share the LO between the signal generator (SG) and the signal analyzer (SA). This value is recommended in test setups that use a VST with NI-RFSG to generate a signal at the DUT's input and RFmx to measure the signal at the DUT's output.

This value automatically: determines whether the SG LO can be shared with SA based on the test instrument used, selected measurement, and the measurement settings. configures instrument specific properties on SA to share the LO between the generator and analyzer, whenever possible.

To enable automatically sharing SG LO with SA, you must first setup the required device specific physical connections mentioned below and then follow the steps in the recommended order.

PXIe-5840/5841/5842: SG LO is shared with SA via an external path. Hence, you must connect RF Out LO Out to RF In LO In using a cable.

PXIe-5830/5831/5832: SG LO is shared with SA via an internal path. Hence, an external cable connection is not required.

NI recommends the following order of steps:

Set LO Source property to Automatic SG SA Shared in NI-RFSG (or enable Automatic SG SA shared LO on NI-RFSG Playback Library). Set LO Source property to Automatic_SG_SA_Shared in RFmx. Configure any additional settings on RFSG and RFmx, including selecting waveforms. Initiate RFSG. Initiate RFmx.

public const string LOSourceAutomaticSGSAShared = "Automatic_SG_SA_Shared"

Public Const LOSourceAutomaticSGSAShared As String = "Automatic_SG_SA_Shared"