How to Step Down a Low Voltage (≤1.0v) DC Signal by a Factor of 0.9 or 50mV Static?
Something like this would reduce the input voltage by 10% and only load the input with 20K.







simulate this circuit &ndash; Schematic created using CircuitLab

I'm not sure where the 20mA you cite comes in- presumably current capability. If it's a current loop signal then you could simply shunt the 50 ohm load resistor with a resistor of value 450 ohms and that would be it (parallel resistance 45 ohms, so voltage drop at 20mA 900mV)