Specifies the Reference Clock source.

Note For the PXIe-5694, if your application requires an external LO source, set this property to None.

Default Values:

PXIe-5694: RefIn

All other devices: OnboardClock

Supported Devices: PXI-5600, PXIe-5601/5603/5605/5606 (external digitizer mode), PXIe-5644/5645/5646, PXI-5661, PXIe-5663/5663E/5665/5667/5668, PXIe-5694, PXIe-5820/5830/5831/5832/5840/5841/5842/5860

Remarks

The following table lists the characteristics of this property.

Short Name Ref Clock Source
Data type cstr.png
Permissions Read/Write
High-level VIs niRFSA Configure Ref Clock
Channel-based No
Resettable Yes
None None

No Reference Clock is required for the current device configuration. This value is valid only for the PXIe-5694 and for the PXIe-5668 to indicate no Reference Clock should be used when an External LO is used with the VSA and the Digitizer will use an External Clock as the Sample Clock Timebase
OnboardClock OnboardClock

PXI-5661�NI-RFSA locks the NI-RFSA device to the PXI-5600 RF downconverter onboard clock.

PXIe-5663/5663E�NI-RFSA locks the PXIe-5663/5663E to the PXI/PXIe-5652 LO source onboard clock. Connect the REF OUT2 connector (if it exists) on the PXI/PXIe-5652 to the CLK IN terminal on the PXIe-5622. On versions of the PXIe-5663/5663E that lack a REF OUT2 connector on the PXI/PXIe-5652, connect the REF IN/OUT connector on the PXI/PXIe-5652 to the CLK IN terminal on the PXIe-5622.

PXIe-5665�NI-RFSA locks the PXIe-5665 to the PXIe-5653 LO source onboard clock. Connect the 100 MHz REF OUT terminal on the PXIe-5653 to the CLK IN terminal on the PXIe-5622.

PXIe-5667�NI-RFSA locks the PXIe-5667 to the PXIe-5653 LO source onboard clock. Connect the 100 MHz REF OUT terminal on the PXIe-5653 to the CLK IN terminal on the PXIe-5622, and connect the 10 MHZ REF OUT terminal on the PXIe-5653 to the REF/LO IN connector on the PXIe-5694.

PXIe-5668�Lock the PXIe-5668 to the PXIe-5653 LO SOURCE onboard clock. Connect the LO2 OUT connector on the PXIe-5606 to the CLK IN connector on the PXIe-5624.

PXIe-5644/5645/5646, PXIe-5820/5840/5841/5842/5860�Lock the NI-RFSA device to its onboard clock.

PXIe-5830/5831/5832�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-5832, connect the PXIe-5820 REF IN connector to the PXIe-3623 REF OUT connector.

PXIe-5831 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-5832 with PXIe-5653�Connect the PXIe-5820 REF IN connector to the PXIe-3623 REF OUT connector. Connect the PXIe-5653 REF OUT (10 MHz) connector to the PXIe-3623 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.

PXIe-5860�Lock to the PXIe-5860 onboard clock.
RefIn RefIn

PXI-5661�NI-RFSA locks the NI-RFSA device to the signal at the external FREQ REF IN connector on the PXI-5600.

PXIe-5663/5663E�Connect the external signal to the PXI/PXIe-5652 REF IN/OUT connector. Connect the REF OUT2 connector (if it exists) on the PXI/PXIe-5652 to the CLK IN terminal on the PXIe-5622. On versions of the PXIe-5663/5663E that lack a REF OUT2 connector on the PXI/PXIe-5652, this configuration can only be used in external digitizer mode.

PXIe-5665�Connect the external signal to the PXIe-5653 REF IN connector. Connect the 100 MHz REF OUT terminal on the PXIe-5653 to the CLK IN connector on the PXIe-5622. If your external clock signal frequency is set to a frequency other than 10 MHz, set the Ref Clock Rate property according to the frequency of your external clock signal.

PXIe-5667�Connect the external signal to the PXIe-5653 REF IN connector. Connect the 100 MHz REF OUT terminal on the PXIe-5653 to the CLK IN connector on the PXIe-5622, and connect the 10 MHZ REF OUT terminal on the PXIe-5653 to the REF/LO IN connector on the PXIe-5694. If your external clock signal frequency is set to a frequency other than 10 MHz, set the Ref Clock Rate property according to the frequency of your external clock signal.

PXIe-5668�Connect the external signal to the PXIe-5653 REF IN connector. Connect the LO2 OUT on the PXIe-5606 to the CLK IN connector on the PXIe-5622. If your external clock signal frequency is set to a frequency other than 10 MHz, set the clock rate parameter according to the frequency of your external clock signal.

PXIe-5694—Connect the Reference Clock signal to the REF/LO IN connector on the PXIe-5694 front panel.

PXIe-5644/5645/5646, PXIe-5820/5840/5841/5842/5860�Lock the NI-RFSA device to the signal at the external REF IN connector.

PXIe-5830/5831/5832�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-5832, connect the PXIe-5820 REF IN connector to the PXIe-3623 REF OUT connector. For the PXIe-5830, lock the external signal to the PXIe-3621 REF IN connector. For the PXIe-5831, lock the external signal to the PXIe-3622 REF IN connector. For the PXIe-5832, lock the external signal to the PXIe-3623 REF IN connector.

PXIe-5831 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-5832 with PXIe-5653�Connect the PXIe-5820 REF IN connector to the PXIe-3623 REF OUT connector. Connect the PXIe-5653 REF OUT (10 MHz) connector to the PXIe-3623 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 REF OUT connector on the PXIe-5655 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.

PXIe-5860�Lock to the signal at the REF IN connector on the PXIe-5860.
PXI_Clk PXI_Clk

PXI-5661�NI-RFSA locks the NI-RFSA device to the PXI backplane clock using the PXI-5600. You must connect the PXI 10 MHz connector to the REF IN connector on the PXI-5600 front panel to use this option.

PXIe-5668�Lock the PXIe-5653 to the PXI backplane clock. Connect the PXIe-5606 LO2 OUT to the LO2 IN connector on the PXIe-5624.

PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5667, PXIe-5694, PXIe-5820/5840/5841/5860�NI-RFSA locks the device to the PXI backplane clock.

PXIe-5830/5831/5832/5841 with PXIe-5655, PXIe-5842, PXIe-5860�NI-RFSA locks the device to the PXI backplane clock. Cables between modules are required as shown in the Getting Started Guide for the instrument.
ClkIn ClkIn

PXI-5661�This configuration does not apply to the PXI-5661.

PXIe-5663/5663E�NI-RFSA locks the PXIe-5663/5663E to an external 10 MHz signal. Connect the external signal to the CLK IN connector on the PXIe-5622, and connect the PXIe-5622 CLK OUT connector to the FREQ REF IN connector on the PXI/PXIe-5652.

PXIe-5665�NI-RFSA locks the PXIe-5665 to an external 100 MHz signal. Connect the external signal to the CLK IN connector on the PXIe-5622, and connect the PXIe-5622 CLK OUT connector to the REF IN connector on the PXIe-5653. Set the Ref Clock Rate property to 100 MHz.

PXIe-5667�NI-RFSA locks the PXIe-5667 to an external 100 MHz signal. Connect the external signal to the CLK IN connector on the PXIe-5622, and connect the PXIe-5622 CLK OUT connector to the REF IN connector on the PXIe-5653. Connect the 10 MHZ REF OUT connector on the PXIe-5653 to the REF/LO IN connector on the PXIe-5694. Set the Ref Clock Rate property to 100 MHz.

PXIe-5668�Lock the PXIe-5668 to an external 100 MHz signal. Connect the external signal to the CLK IN connector on the PXIe-5624, and connect the PXIe-5624 CLK OUT connector to the REF IN connector on the PXIe-5653. Set the clock rate parameter to 100 MHz.

PXIe-5644/5645/5646, PXIe-5820/5830/5831/5832/5840/5841/5842/5860�This configuration does not apply.
PXI_ClkMaster PXI_ClkMaster

PXIe-5831 with PXIe-5653�NI-RFSA 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.

PXIe-5832 with PXIe-5653�NI-RFSA configures the PXIe-5653 to export the Reference clock and configures the PXIe-5820 and PXIe-3623 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.

PXI-5661, PXIe-5663/5663E/5665/5667/5668, PXIe-5644/5645/5646, PXIe-5820/5830/5831/5832/5840/5841/5842/5860�This configuration does not apply.