seyyah
Advanced Member level 2
To measure a high current(up to 30A, typically 15-20A.) i used a resistor based current measurement. I connected the sensing resistor to the low side and amplified(x10) the voltage on the resistor via an opamp (LM358N). Then i applied some tests and saw that, output voltage of the opamp is not directly proportional to the current. What may be the problem?