Patent ID: 11971770
Assignee: nan
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. A current calibration method for power supply channels formed by the current calibration device of claim 1 in a test system, comprising following steps:
S01: the host computer selects one of connection switches and one of selection switches to close to form a power supply channel of the n power supply channels;
S02: the SPI bus adjusts an output voltage (Va) of the power supply channel and an output voltage (Vb) of the VBIAS power supply, and records a value of an output current (Ia) of the power supply channel and a value of a measured current (Ib) of a ammeter;
S03: drawing a curve of output voltages (Va) and measurement errors (A) of the n power supply channels according to the values in S02; the measurement errors (A) are absolute differences between values of output currents (Ia) of the n power supply channels and values of measured currents (Ib) of the ammeter;
S04: dividing the curve into p intervals within an output voltage range of the power supply channel and calculating an absolute error of each of the p intervals respectively; p is an integer greater than 0;
S05: a current value of the power supply channel of the n power supply channels under the output voltage is equal to sum of the value of the measured current of the ammeter and the absolute error of an interval corresponding to a specific output voltage.