Specifies the number of S-Parameters to measure.

Note1: S-Parameters of a N-port DUT can be represented by N^2 canonical S-Parameters viz. S11, S12,...,S1N, S21, S22,...,S2N, SN1, SN2,...,SNN such that

B = S A

where S denotes the S-Parameter matrix with Sij being the element in the ith row and jth column. Similarly A denotes the matrix composed of the incident waves. Element Aij denotes the wave parameter aij i.e., wave measured at the reference reciever on port <i> with port <j> as the source. Similarly B denotes the matrix composed of the scatterred waves. Element Bij denotes the wave parameter bij i.e., wave measured at the test reciever on port <i> with port <j> as the source.

You can configure each measured S-Parameter in RFmxVNA SParams measurement to be returned in one of several supported formats using SParams Format property. Example1: If you want to fetch magnitude and phase information of S11, then set Number of S-Parameters property to 2, then for both SParam indices 0 and 1, set Parameter property to "S11". Then set SParams Format property to Magnitude for Sparam index 0 and to Phase for SParam index 1.

Note2: You can set many SParam indices to share the same Parameter and Format property values making them duplicates of each other.

If you increase this property value from N to N+K, then existing N SParams are not affected but K new SParams are added. If you reduce number of SParams from N to N-K, then last K SParams are deleted without affecting the remaining N-K SParams.

You do not need to use a selector string to configure or read this property for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals.

The default value is 1.

Remarks

The following table lists the characteristics of this property.

Short Name SParams Num SParams
Data type ci32.png
Permissions Read/Write
High-level VIs N/A
Resettable Yes