High-precision V-I source meter

The invention discloses a high-precision V-I source table which comprises a subtractor, a voltage and current adjusting module, a mode switching module and a voltage and current detecting module, variables e (k) and e (k-1) and parameters Kp, Ki and Kd are substituted into a formula (1) at the same time, and a DAC chip voltage set value u (k) corresponding to a voltage target value is calculated and output to a backward stage to update the DAC chip voltage set value; step 1-3, if e (k) is greater than gt; 0 and e (k) gt; if delta e (k) is greater than delta e (k), repeating the steps 1-1, 1-2 and 1-3, and performing loop iteration until the voltage measurement value V (k) at the current moment is approximately equal to the voltage target value V0, namely e (k) is less than or equal to delta e (k), and the voltage measurement value is the voltage set value u (k) corresponding to the voltage target value at the moment. The system has the advantages of high V-I output precision and high output regulation respons