The shape of the waveform is described by the following table:
parameters default value units vo (offset) volts or amps va (amplitude) volts or amps freq (frequency) 1/tstop hz td (delay) 0.0 seconds theta (damping factor) 0.0 1/seconds
time value 0 vo td vo + va . exp(-(time-td) . theta) . sin(2 . freq . (time+td))
This function applies only to transient analysis, where time is the running variable. When referring to default values, tstep is the printing increment and tstop is the final time in transient analysis, see 2.7.9 for explanation. The argument count is used to distinguish this function from the math function of the same name.