The technical indicators of DC power supply can generally be divided into two categories. One is the characteristic indicators, which include the allowable voltage to be transmitted, the voltage and current to be transmitted, and the adjustment range of the voltage to be transmitted. Another type is the quality indicator, which is used to measure the smoothness of the delivered DC power supply, including the coefficient of stable voltage, as well as the delivered resistance, ripple voltage, and temperature coefficient. Now let me introduce the methods of quality testing to everyone. (1) Ripple voltage of DC power supply: This refers to the AC voltage component superimposed on the output voltage. The peak value can be observed using an oscilloscope in the DC power supply, and the detection result is calculated in millivolt level. An AC millivolt meter can also be used to detect the effective value, but the ripple is not a sine wave, so there may be some error. (2) Stable voltage coefficient: If the load current and ambient temperature do not change, the relative change in the delivered voltage will cause a relative change in the output voltage of the DC power supply. (3) Probability of adjustment of current pressure: The relative change in input voltage is ± 10% of the change in output voltage. The stable voltage coefficient and voltage regulation probability both indicate the interference of input voltage changes on output voltage, so only one of them needs to be verified and tested
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