Honored Contributor
Honored Contributores to measure the current you need to do measure in series with the board, by useing a scope or a meter. I will explain the problems with each.
If you are just wanting a simple value of the current used then use an ammeter in series with the board or sub section of the board. Most digital ammeters will be fine for this. If you are wanting to measure the current then you will either need to insert a low value resistor and measure the voltage across it, or use a scope current probe. The low value resistor approach can be difficult as the measured voltages will be very small and there will be a lot of noise about. You will do better if you reduce the bandwidth on the scope to say 20MHz or less. A current probe is easy to use you just put the wire you want to test in the probe and it is displayed on the scope. Get back to me if you need more info. Uk Fixer
