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-5820/5830/5831/5832/5840/5841/5842/5860

Default Value: Onboard Clock

Related Topics

Timing Configurations

Remarks

The following table lists the characteristics of this property.

Short Name Reference Clock Source
Data type cstr.png
Permissions Read/Write
High-level VIs niRFSG Configure Ref Clock
Channel-based No
Resettable Yes
Onboard Clock OnboardClock

Uses the onboard Reference Clock as the clock source.

PXIe-5830/5831—For the PXIe-5830, connect the PXIe-5820 REF IN connector to the PXIe-3621 REF OUT connector. For the PXIe-5831/5832, connect the PXIe-5820 REF IN connector to the PXIe-3622 REF OUT connector.

PXIe-5831/5832 with PXIe-5653—Connect the PXIe-5820 REF IN connector to the PXIe-3622 REF OUT connector. Connect the PXIe-5653 REF OUT (10 MHz) connector to the PXIe-3622 REF IN connector.

PXIe-5841 with PXIe-5655—Lock to the PXIe-5655 onboard clock. Connect the REF OUT connector on the PXIe-5655 to the PXIe-5841 REF IN connector.

PXIe-5842—Lock to the associated PXIe-5655 onboard clock. Cables between modules are required as shown in the Getting Started Guide for the instrument.
RefIn RefIn

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

PXIe-5830/5831—For the PXIe-5830, connect the PXIe-5820 REF IN connector to the PXIe-3621 REF OUT connector. For the PXIe-5831, connect the PXIe-5820 REF IN connector to the PXIe-3622 REF OUT connector. For the PXIe-5830, lock the external signal to the PXIe-3621 REF IN connector. For the PXIe-5831/5832, lock the external signal to the PXIe-3622 REF IN connector.

PXIe-5831/5832 with PXIe-5653—Connect the PXIe-5820 REF IN connector to the PXIe-3622 REF OUT connector. Connect the PXIe-5653 REF OUT (10 MHz) connector to the PXIe-3622 REF IN connector. Lock the external signal to the PXIe-5653 REF IN connector.

PXIe-5841 with PXIe-5655—Lock to the signal at the REF IN connector on the associated PXIe-5655. Connect the PXIe-5655 REF OUT connector to the PXIe-5841 REF IN connector.

PXIe-5842—Lock to the signal at the REF IN connector on the associated PXIe-5655. Cables between modules are required as shown in the Getting Started Guide for the instrument.
PXI Clock PXI_CLK

Uses the PXI_CLK signal, which is present on the PXI backplane, as the clock source. Cables between modules are required as shown in the Getting Started Guide for the instrument.
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-5820/5830/5831/5831/5832 with PXIe-5653/5840/5841/5841 with PXIe-5655.
RefIn2 RefIn2
PXI_ClkMaster PXI_ClkMaster

This value is valid on only the PXIe-5831/5832 with PXIe-5653.

PXIe-5831/5832 with PXIe-5653—NI-RFSG configures the PXIe-5653 to export the Reference clock and configures the PXIe-5820 and PXIe-3622 to use PXI_Clk as the Reference Clock source. Connect the PXIe-5653 REF OUT (10 MHz) connector to the PXI chassis REF IN connector.