I did not get your question!

what is the electrochemical process you want to do? and what is the information you want to get? you should specify what you want to do first.

Anyway, you can get full description about your electrochemical system through CV. you can get an information about both the anodic and cathodic directions; peak currents, peak potentials and peak separation (that is related to the reversibility of your electrochemical system).

initially, we have to perform CV to get all the above information then we can use linear sweep voltammetry or differential pulse voltammetry to do another job. However in some cases depends on the electrochemical process such as hydrogen evolution reaction or oxygen reduction LSV is the main test . the examples are many and again depends on your job.

Use linear sweep when you're only interested in the processes that occur along the direction you apply the potential (positive or negative). In other words, you don't care what happens on the return sweep.

In cyclic voltammetry only one cycle is needed to acquire information. But if your substrate changes and want to learn more about that change, then you can cycle through more than once.

I don't think your question helps to understand the processes and the purpose of voltammetry analysis. Indeed, there are numerous reasons for pursuing cyclic voltammetry and linear sweep voltammetry; analyzing the redox processes, capacitance measurement, onset potential, finding the space-charge region, even for depositing material, changing morphology and list go on.

I would like to have a more precise question.

Thank you all, I think i get specific answer for my general question from Jose Martinez.