X Unit (X Scale)
(applies only to Real vs. Imag trace format)
specifies the unit conversion to apply to the underlying trace data's x-axis values (for example Vpk to Vrms). Together with the X Axis Format parameter, which determines whether to show the magnitude of the x-axis value, these two parameters determine the units shown on the trace.
Set to to let the VSA choose an appropriate unit conversion.
See Also
