Purpose: The PV class manages data-acquisition for a Pulse Voltammetry curve.

There may be more than one data-acquisition object in a script, but only one may be running (i.e., acquiring values) at any time. The typical life cycle of a PV object is:

Pv = PV.New(Tag, Pstat) ; Create the Pv
Pv.SetPlot(Plottype)  ; Determine the plot type
Pv.Run()   ; Run the curve
Pv.Printl()   ; Print the curve out to Output

When a PV object is run, the potentiostat must be in either in Potentiostatic or Galvanostatic mode.