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3 VMA Mode

3.6 Occupied BW Measurement

Software Preselection

Provided in some instruments, either to compensate for issues with provided

hardware preselection or to provide the preselection function when there is no

hardware preselector.

N9041B

Software Preselection compensates for the frequency range limit of the microwave

preselector. Since the microwave preselector only goes up to 50GHz, software

preselection must be used to suppress and separate images above 50GHz. The

specific algorithm used for software preselection is specified by the SW Preselection

Type selection – Normal or Advanced.

In N9041B, Software Preselection only applies for frequencies above 50GHz,

therefore it is only used for RF Input 2. Even if turned on, it is not used for other

inputs, and never for frequencies below 50GHz. This is why the label of this control

contains the parenthetical note “(>~50GHz)”.

Note that in N9041B, in Swept SA measurement, Software Preselection works even

if the measurement is using an FFT Sweep Type. In measurements other than Swept

SA, Software Preselection is not used if the measurement is using an FFT sweep

type.

N9042B+V3050A

Software Preselection compensates for the frequency range limit of the microwave

preselector. Since the microwave preselector only goes up to 50GHz, software

preselection must be used to suppress and separate images above 50GHz. The

specific algorithm used for software preselection is specified by the SW Preselection

Type selection – Normal or Advanced.

For N9042B+V3050A, Software Preselection only applies for frequencies above

50GHz, therefore it is only used for External RF. Even if it is turned on, it will not be

used for other inputs and never for frequencies below 50GHz. This is why the label

of this control contains the parenthetical note “(>~50GHz)”.

Note that for N9042B+V3050A, in the Swept SA measurement, Software

Preselection works even if the measurement is using an FFT Sweep Type. In

measurements other than Swept SA, Software Preselection is not used if the

measurement is using an FFT Sweep Type.

VXT models M9410A/11A/15A/16A

Software Preselection is used to provide the preselection function, as there is no

hardware preselector in these models. Two background traces are taken and

compared point by point, and the point with the lowest amplitude from the two

Vector Modulation Analyzer Mode User's &Programmer's Reference 980

Keysight x-series Programmer's Reference

Other manuals for Keysight x-series