System for precision measurement of electrical current

A current measurement system configured for measuring current at a current input terminal, comprising:

• a controlling unit outputting a control signal;
• a voltage generating unit coupling the controlling unit and the current input terminal;
• wherein the voltage generating unit receives the control signal, and converts the current into different voltage signals;
• a voltage obtaining unit coupling the voltage generating unit and obtaining the voltage signals from the voltage generating unit;
• a voltage amplifying unit coupling the voltage obtaining unit, and amplifying the voltage signals by a preset coefficient to obtain an amplified voltage signal;
• and
• a converting unit coupling between the voltage amplifying unit and performing analog-to-digital conversion on the amplified voltage signal to obtains a digital signal, and outputting the digital signal;
• and
• a processing unit coupling the converting unit and converting the digital signal to obtain a corresponding value of current.