Hi,
how is autoranging implemented in the medium-to-high precision digital voltage meters? Specifically, how do they maintain high input impedance (that is, low input current), high dynamic range and high accuracy, all at the same time? My Sanwa PC7000 proves it is doable. What's the trick?
Finally I have found some time to get back to my 1kW dummy load and exactly this problem appeared.
Best regards, Piotr