LO:LO PLL Fractional Mode Property

RFmx Demod 19.1 Help

Edition Date: October 2019

Part Number: 374641M-01

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Short Name: LO PLL Fractional Mode

Property of RFmxInstr

Specifies whether to use fractional mode for the local oscillator (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.

To use this property for the PXIe-5830/5831, you must first use the selector string property to specify the name of the channel you are configuring. You can configure LO1 and LO2 channels by using lo1 or lo2 as the selector string, or set the selector string to lo1, lo2 to configure both channels. You can also use RFmxInstr Build LO String utility function to create the LO String. For all other devices, the only valid value for the selector string is "" (empty string).

Note   The LO PLL Fractional Mode attribute is applicable only when using the internal LO.
Note   For the PXIe-5831 with PXIe-5653 and PXIe-5840 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-5830/5831/5840/5841

Disabled (0)

Indicates that the property is disabled.

Enabled (1)

Indicates that the property is enabled.

Remarks

The following table lists the characteristics of this property.

Datatype /images/reference/en-XX/help/374641M-01/ci32.gif
PermissionsRead/Write
High-level VIs N/A
ResettableYes

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