Refers to the IQ Carrier Frequency property in NI-RFSA, the Frequency property in NI-RFSG, and the Center Frequency property in RFmx.

Refers to the NI-RFSADownconverter Frequency Offset Mode property or NI-RFSGUpconverter Frequency Offset Mode property set to Automatic.

Equivalent to the term Offset Mode is Automatic.

The PXIe-5841 uses a direct conversion architecture. Offset Mode allows the instrument to operate in low IF mode, which increases the separation between the signal of interest and the residual sideband image and residual LO leakage power. However, low IF mode limits the available instantaneous bandwidth. A setting of Automatic allows the driver to set Offset Mode to Enabled when the signal bandwidth is configured as small enough to allow it. You can read back the Offset Mode to determine if the driver selected Enabled or User-Defined.

Automatic is the default value. NI recommends keeping Offset Mode set to the default value.

Refers to the NI-RFSA Downconverter Frequency Offset Mode property or NI-RFSGUpconverter Frequency Offset Mode property set to Enabled.

Equivalent to the following terms or conditions:

• Offset Mode is Enabled
• Signal Bandwidth ≤ Maximum Offset Bandwidth

The PXIe-5841 uses a direct conversion architecture. Offset Mode allows the instrument to operate in low IF mode, which increases the separation between the signal of interest and the residual sideband image and residual LO leakage power.

Refers to the NI-RFSADownconverter Frequency Offset Mode property or NI-RFSGUpconverter Frequency Offset Mode property set to User-Defined.

Equivalent to the following terms or conditions:

• Offset Mode is User-Defined
• Signal Bandwidth > Maximum Offset Bandwidth

The PXIe-5841 uses a direct conversion architecture. Offset Mode set to User-Defined allows the instrument to operate with maximum instantaneous bandwidth.

With respect to local oscillators, refers to the value of the LO Source property. A value of Onboard configures the hardware to use the integral local oscillator of the instrument, that of the associated PXIe-5655 module(s).

With respect to reference clocks, refers to the value of the NI-RFSGReference Clock Source or NI-RFSARef Clock Source properties. A value of Onboard Clock configures the hardware to use the integral reference clock of the instrument, that of the associated PXIe-5655 module(s).

For input—Power of an acquired signal with respect to the instrument's configured reference level. For example, if the reference level is set to -10 dBm and the acquired tone is -17 dBm, the signal is said to be at -7 dBr.

For output—Generated power of a CW with respect to the instrument's peak power setting. For example, with a peak power level setting of +5 dBm and a -3 dBr setting, the power of the generated CW is +2 dBm.