One should be aware that measurements are performed using data saved in the plot structure as a simulation progresses. The accuracy of the results is directly affected by the density of saved points. In transient analysis, one may wish to use internal time point data by setting the steptype=nousertp option. This avoids the interpolation to tranient time increments which may reduce accuracy if the increment is too coarse.
The following measurements are available when an interval has been specified.
These functions are also available in general expressions outside of the measure command: mmin, mmax, mpp, mavg, mrms, mpw, mrft. Each of these functions takes three arguments: (vector, scaleval1, scaleval2). The two scale values frame the area of measurement. These must be chosen to isolate the feature of interest for rise/fall/width measurement. If not in range of the vector scale, the vector scale endpoints are assumed.
When a point has been specified, the only measurement form available is
A .measure statement can contain any number of measurements, including no measurements. If no measurement is specified, the vector produced contains only zeros, however the scale vector contains the start and stop values, which may be the only result needed. The created vector, which is added to the current plot, will be of length equal to the number of measurements, with the results placed in the vector in order.
The measurement scale point(s) in .measure statements are also saved in a vector, which is the scale for the result vector. If the measurement name is ``result'', then the scale vector is named ``result_scale''. The scale contains one or two values, depending on whether it is a point or interval measurement.