Specifies an offset from the I/Q carrier frequency for the downconverter.

Syntax

NIRFSA_ATTR_DOWNCONVERTER_FREQUENCY_OFFSET

Numeric Value

Data Type

Access

Applies To

1150203

ViReal64

Read/Write

N/A

Remarks


If you set this attribute, any measurements outside the instantaneous bandwidth of the device are invalid. After you set this attribute, the RF downconverter is locked to that frequency offset until the value is changed or the attribute is reset.

Valid Values:

PXIe-5646:: -100 MHz to +100 MHz

PXIe-5830/5831/5832/5840/5841:: -500 MHz to +500 MHz

All other devices:: -42 MHz to +42 MHz

Default Values:: For spectrum acquisition types the driver automatically calculates the default to avoid residual LO power. For I/Q acquisition types the default is 0 Hz. If the center frequency is set to a non-multiple of the NIRFSA_ATTR_LO_FREQUENCY_STEP_SIZE attribute, the NIRFSA_ATTR_DOWNCONVERTER_FREQUENCY_OFFSET attribute is set to compensate for the difference.

Supported Devices:: PXIe-5644/5645/5646, PXIe-5830/5831/5832/5840/5841/5842

Related Topics

PXIe-5830 Frequency and Bandwidth Selection

PXIe-5831/5832 Frequency and Bandwidth Selection

PXIe-5841 Frequency and Bandwidth Selection