You will want to connect your lead from the electrical device or source to the input terminals of the oscilloscope. You will put this into the channel 1 slot, since most of the scopes out there have more than one channel. Next, you can turn the oscilloscope on and choose the scale that is going to be correct for the input signal. The scale is the amount of length that you have on the scope. You will be able to see full cycles on the scope, but you must make sure that you set it to show you at least a millisecond of information.
You will then choose the range on the scope that matches your signal. This is going to be the minimum and maximum voltages that the scope is going to show. Next, you will set the threshold. You have to make sure that the signal is higher than the threshold value before you will see the signal displayed. Finally, you will see that signal in the form of a dot that moves up and down on the screen. This is what you will be able to record.