If you read the Asahi or Nat Cam service manuals, you'll see that in some cases the Spotmatics didn't use a balanced bridge, and there was a specific non-zero meter curent for a centered needle. Would someone please show me the network analysis proving the current doesn't change at all? While everyone may be right in practice (the change is small), I want to be convinced of the theoretic soundness (the change is zero). Every fiber of my being says current flow is linearly dependent on voltage in a resistor net. Prove me wrong please!