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

NoteFor the PXIe-5665/5668, 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 Theory of Operation or the PXIe-5668 Theory of Operation topics in the NI RF Vector Signal Analyzers Help.

You do not need to use a selector string if you want to configure this property for all signal instances. Specify the signal name in the selector string if you want to configure or read that signal instance. Refer to the Selector Strings topic for information about the string syntax.

The default value is AC Coupled.

Valid values
  • PXIe-5665 (3.6 GHz): AC Coupled DC Coupled
  • PXIe-5665 (14 GHz): AC Coupled, DC Coupled
  • PXIe-5668: AC Coupled

Supported devices: PXIe-5665/5668

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
Resettable Yes
AC Coupled 0

Specifies that the RF input channel is AC-coupled. For low frequencies (<10 MHz), accuracy decreases because RFmxInstr does not calibrate the configuration.
DC Coupled 1

Specifies that the RF input channel is DC-coupled. The RFmx driver enforces a minimum RF attenuation for device protection.