How to measure the maximum reverse voltage and the maximum rectification current of a rectifier diode?

  Schottky diodes have the advantages of low impedance, small forward voltage drop and fast recovery speed, so they are often used in high-frequency and high-current rectification and power-down protection lines. The common test method of Schottky diode voltage drop is tested with "DCPOWERSUPPLY" instrument (constant current and regulated DC current): first give a small voltage so that there is a current through the Schottky diode, and then slowly adjust the current to reach the rated current of the Schottky diode under test, and then read it after the voltage value is stable, and the stable reading is the voltage drop of the rated current.

 Why a stable voltage reading is the correct voltage drop reading: The impedance of a Schottky diode is not fixed, but decreases with temperature (non-linear relationship). When there is an electric current passing through the Schottky diode, the die will generate heat, and then dissipate it through the diodee body, and when the thermal equilibrium is reached (the heat generated by the die can be dissipated in time), the impedance at this time is relatively stable, which is the law of conservation of energy (P=I2R, P is converted into heat). If you test directly with the rated current, the initial reading is high, because the die is at room temperature at this time, the impedance is the largest, and the reading will gradually decrease over time, because the impedance decreases with the increase of temperature. Some users are limited by the test instrument and directly use the multimeter to test, although the multimeter has this gear of the test diode, but its output current is only one or two milliamperes, the reading of the test is not "internal resistance", but the voltage drop when the current is milliampere, and the reading displayed when testing the voltage drop of each batch of Schottky diodes in this way may deviate greatly, and the working current of Schottky diodes is usually amperere, and the difference between the two is a thousand times