Specifies whether the RF IN connector is AC- or DC-coupled on the downconverter.

Note For the PXIe-5605/5606/5665/5667/5668, this property must be set to AC Coupled when the DC block is present and set to DC Coupled when the DC block is not present to ensure device specifications are met and proper calibration data is used. For more information about removing or attaching the DC block, refer to the PXIe-5665 Block Diagram, the PXIe-5605 Front Panel and LEDs, the PXIe-5667 Block Diagram, or the PXIe-5668 Block Diagram topics in this help file.

Valid Values:

PXIe-5603/5665 (3.6 GHz)—AC Coupled, DC Coupled

PXIe-5605/5665 (14 GHz)—AC Coupled, DC Coupled

PXIe-5667 (3.6 GHz) using the PXIe-5693 RF preselector low-frequency bypass path—AC Coupled, DC Coupled

PXIe-5667 (3.6 GHz) using the PXIe-5693 RF preselector filter path—AC Coupled

PXIe-5667 (7 GHz)—AC Coupled

PXIe-5606/5668—AC Coupled, DC Coupled

Default Value: AC Coupled

Supported Devices: PXIe-5603/5605/5606 (external digitizer mode), PXIe-5665/5667/5668

Remarks

The following table lists the characteristics of this property.

Short Name Channel Coupling
Data type ci32.png
Permissions Read/Write
High-level VIs N/A
Channel-based No
Resettable Yes
AC Coupled 3001

Specifies that the RF input channel is AC-coupled. For low frequencies (<10 MHz), accuracy decreases because NI-RFSA does not calibrate the configuration.
DC Coupled 3002

Specifies that the RF input channel is DC-coupled. NI-RFSA enforces a minimum RF attenuation for device protection.