LO:LO PLL Fractional Mode Property

LO:LO PLL Fractional Mode Property

Short Name: LO PLL Fractional Mode

Property of RFmxInstr

Specifies whether to use fractional mode for the LO phase-locked loop (PLL).

Fractional mode provides a finer frequency step resolution, but may result in non harmonic spurs. Refer to the specifications document of your device for more information about fractional mode and non harmonic spurs.

For PXIe-5830/5831/5832, if you want to configure or read on LO1 or LO2 channel, use "lo1" or "lo2" as part of the selector string. You do not need to use a selector string or use "lo1, lo2" as part of the selector string if you want to configure this property for both channels. You can also use RFmxInstr Build LO String utility function to create the LO String. For all other devices, lo channel string is not allowed.

Note  This property is not supported on a MIMO session.

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 on that signal instance. Refer to the Selector string topic for information about the string syntax.

Note   The LO PLL Fractional Mode attribute is applicable only when using the internal LO.

Note   For PXIe-5831 with PXIe-5653, PXIe-5832 with PXIe-5653, this property is ignored if the PXIe-5653 is used as the LO source.

The default value is Enabled.

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

Remarks

The following table lists the characteristics of this property.

Datatype
Permissions	Read/Write
High-level VIs	N/A
Resettable	Yes