I have a frequency set and voltage set of values. What I want to do is create a listbox of frequencies and voltages which is chosen by users and then the testing is done at all frequency and voltages selected by the user. Example if the user selects say 50 Hz and 60 Hz and 100V and 150V, there should be an automated loop which takes the combination of these values (here 4) and does the measurement. All the tests should be done serially. Can you tell me how is that possible or if possible could you please attach a sample VI.