Patent ID: 9696352
Date: 2017-07-04
CPC Classifications: G01R

Claim:
1. A system for determining the no-load offset of a circuit, the system consisting of: a shunt resistor with an input and an output, wherein the input of the shunt resistor also leads to one input of an amplifier and the output of the shunt resistor also leads to a second input of the amplifier; a switch controlled by a microcontroller, a first side of said switch being connected to one of the input and output of the shunt resistor; a small value resistor, a first end of the small value resistor being connected to the other of the input and output of the shunt resistor, and a second end of the small value resistor being connected to a second side of the switch; wherein the switch is actuated by the microcontroller to selectively break the connection between its side of the shunt resistor and the respective input of the amplifier such that the other side of the shunt resistor leads to one input of the amplifier as normal, and also leads to the other input of the amplifier through the small value resistor.