Clock:Reference Clock Source Property

NI RF Signal Generators Help (NI-RFSG 18.1)


Edition Date: June 2018
Part Number: 371025V-01
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Short Name: Reference Clock Source

Property of niRFSG

Specifies the Reference Clock source. To set this property, the NI-RFSG device must be in the Configuration state.

Note  The PXI-5670/5671 and PXIe-5672 devices also allow you to drive the PXI 10 MHz backplane clock with the PXI Chassis Clk 10 Source property.

Supported Devices: PXI-5610, PXIe-5644/5645/5646, PXI/PXIe-5650/5651/5652, PXIe-5653/5654/5654 with PXIe-5696, PXI-5670/5671, PXIe-5672/5673/5673E, PXIe-5820/5840

Default Value: Onboard Clock

Related Topics

PFI Lines

Timing Configurations

Onboard Clock (OnboardClock)

Uses the onboard Reference Clock as the clock source.

PXIe-5840 with PXIe-5653—Lock to the PXIe-5653 onboard clock. Connect the REF OUT (10 MHz) connector on the PXIe-5653 to the PXIe-5840 REF IN connector. Configure open NI-RFSA sessions to the device to use RefIn for the PXIe-5840 or RefIn2 for the PXIe-5840 with PXIe-5653.

RefIn (RefIn)

Uses the clock signal present at the front panel REF IN connector as the clock source.

PXIe-5840 with PXIe-5653—Lock to the signal at the REF IN connector on the associated PXIe-5653. Connect the REF OUT (10 MHz) connector on the PXIe-5653 to the PXIe-5840 REF IN connector.

PXI Clock (PXI_CLK)

Uses the PXI_CLK signal, which is present on the PXI backplane, as the clock source.

ClkIn (ClkIn)

Uses the clock signal present at the front panel CLK IN connector as the clock source. This value is not valid for the PXIe-5644/5645/5646 or PXIe-5820/5840/5840 with PXIe-5653.

RefIn2 (RefIn2)

This value is valid on only the PXIe-5840 with PXIe-5653. NI-RFSG locks the Reference Clock to the clock sourced at the PXIe-5840 REF IN terminal that is already configured by an NI-RFSA session. Connect the PXIe-5840 REF OUT connector to the PXIe-5653 REF IN connector. Configure open NI-RFSA sessions to the device to use RefIn for the PXIe-5840 or OnboardClock for the PXIe-5840 with PXIe-5653.

PXI_ClkMaster (PXI_ClkMaster)

This value is valid on only the PXIe-5840 with PXIe-5653. NI-RFSA configures the PXIe-5653 to export the Reference Clock, and configures the PXIe-5840 to use PXI_Clk. Connect the PXIe-5653 REF OUT (10 MHz) connector to the PXI Chassis REF IN connector. For best performance, configure all other devices in the system to use PXI_Clk as the Reference Clock source.

Remarks

The following table lists the characteristics of this property.

Datatype string
PermissionsRead/Write
High-level VIs niRFSG Configure Ref Clock
Channel-based No
ResettableYes

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