The measure Command

The measure command allows one to set up a runop (see 4.6) which will identify a measurement point or interval, and evaluate an expression at that point, or call a number of measurement primitives that apply during the interval, such as rise time or pulse width.

measure analysis resultname point | interval [measurements] [postcmds]
measure analysis resultname param=expression [postcmds]

The command will apply, if active, when any circuit is being run. There is also a .measure input syntax element which will set up the measurement on that circuit only. Both use the identical syntax described below. The syntax is based on the .measure statement in HSPICE.

analysis
This specifies the type of analysis during which the measurement will be active. Exactly one of the following keywords should appear in this field: tran, ac, dc.

resultname
This field specifies a name for the measurement. The name should be unique among the measurements in the circuit, and among vectors in scope during simulation. The name should start with an alphabetic character and contain no white space or other special characters.

A vector with this name will be added to the current plot, if the measurement is successful. Vector names found in .measure lines are added to the internal save list, guaranteeing that the necessary data will be available when needed, whether or not the vector has been mentioned in a .save line.