Specifies the format for wave measurement.

Use "wave<n>" as the selector string to configure or read this property.

Use RFmxVNA Waves Fetch Y Data to fetch the waves.

The default value is Magnitude.

Remarks

The following table lists the characteristics of this property.

Short Name Waves Format
Data type ci32.png
Permissions Read/Write
High-level VIs N/A
Resettable Yes
Magnitude 0

Sets the format for the selected wave to Magnitude. You can specify Wave Magnitude Units.
Phase 1

Sets the format of the selected wave to Phase. Phase values are expressed in degrees. Phase can be represented in various, mathematically equivalent ways such as phase wrapped between the range [-180, 180) degrees, or phase can be represented in an unwrapped manner. You can specify the phase representation by configuring Wave Phase Trace Type.
Complex 2

Sets the format for the selected wave as complex numbers in cartesian co-ordinates.
SWR 3

Sets the format for the selected wave to Standing Wave Ratio (SWR). SWR is a unitless quantity.
Smith Impedance 4

Sets the format for the selected wave to Smith Impedance. The measured values of the wave are transformed into impedence values. Impedence values are expressed in ohms. You can use these values to plot on a Smith Chart.
Smith Admittance 5

Sets the format for the selected wave to Smith Admittance. The measured values of the wave are transformed into admittance values. Admittance values are expressed in siemens. You can use these values to plot on an Inverted Smith Chart.
Polar 6

Sets the format for the selected wave as complex numbers in polar co-ordinates, where the radial axis (i.e., magnitude of the complex numbers) is always in linear scale and angular axis (phase) is represented in degrees and always wrapped between ±180 deg.
Group Delay 7

Sets the format of the selected wave to Group Delay. Group delay represents the time it takes for the signal to pass through a device under test. The delay is expressed in seconds.

Group delay vs. frequency is derived from phase vs. frequency response. At a given frequency point, group delay is computed by selecting two nearby frequency points and taking the ratio of the phase difference to the frequency separation between them. The frequency separation between the two selected points is called the group delay aperture.

You can control the aperture by first configuring Waves Group Delay Aperture Mode and once the mode is selected, you can set the aperture by configuring Waves Group Delay Aperture Points, Waves Group Delay Aperture Percentage or Waves Group Delay Aperture Frequency Span.

For example, if the number of aperture points is equal to 3, then group delay at a nth frequency point is computed by selecting the (n-1)th frequency point and (n+1)th frequency point.