NIRFSG_ATTR_REF_CLOCK_SOURCE

NI RF Signal Generators Help (NI-RFSG 18.1)


Edition Date: June 2018
Part Number: 371025V-01
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Numeric Value Data
type
Access Coercion High Level Functions
1150001 ViString R/W None niRFSG_ConfigureRefClock

Description

Specifies the Reference Clock source. To set this attribute, the NI-RFSG device must be in the Configuration state. Only certain combinations of this attribute and the NIRFSG_ATTR_PXI_CHASSIS_CLK10_SOURCE attribute are valid, as shown in the following table.

Note Note  The PXI-5670/5671 and PXIe-5672 devices also allow you to drive the PXI 10 MHz backplane clock on PXI chassis only using the NIRFSG_ATTR_PXI_CHASSIS_CLK10_SOURCE attribute.

Defined Values:


NIRFSG_VAL_ONBOARD_CLOCK_STR 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 NIRFSA_VAL_REF_IN_STR for the PXIe-5840 or NIRFSA_VAL_REF_IN_2_STR for the PXIe-5840 with PXIe-5653.
NIRFSG_VAL_CLK_IN_STR Uses the clock signal present at the front panel CLK IN connector as the Reference Clock source. This value is not valid for the PXIe-5644/5645/5646 or PXIe-5820/5840/5840 with PXIe-5653.
NIRFSG_VAL_REF_IN_STR Uses the clock signal present at the front panel REF IN connector as the Reference 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.
NIRFSG_VAL_PXI_CLK_STR Uses the PXI_CLK signal, which is present on the PXI backplane, as the Reference Clock source.
NIRFSG_VAL_REF_IN_2_STR 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 NIRFSA_VAL_REF_IN_STR for the PXIe-5840 or NIRFSA_VAL_ONBOARD_CLOCK_STR for the PXIe-5840 with PXIe-5653.
NIRFSG_VAL_PXI_CLK_MASTER_STR This value is valid on only the PXIe-5840 with PXIe-5653. NI-RFSG configures the PXIe-5653 to export the Reference Clock, and configures the PXIe-5840 to use NIRFSG_VAL_PXI_CLK_STR. 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 NIRFSG_VAL_PXI_CLK_STR as the Reference Clock source.

Default Value: NIRFSG_VAL_ONBOARD_CLOCK_STR

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

Related Topics

PFI Lines

Timing Configurations

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