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Measurement method for voltage stabilizing value of voltage stabilizing diodes

A simple test method for voltage regulator diodes: This type of method only requires a digital multimeter. The method is to place the digital multimeter in Rx15k gear and set it to zero. The red DC Ammeter is connected to the positive stage of the voltage stabilizing electrode tube to be measured, and the black DC Ammeter is connected to the negative stage of the tube to be measured. When the meter needle reaches a certain position, read its stable data information from the digital multimeter DC 10V working voltage scale, and then use the following calculation formula to calculate the voltage stabilizing tube value: the voltage stabilizing tube value to be measured (V)=(10V reading scale value) x1.5. This method can be used to measure voltage regulators with values below 15V.

Test method for external power supply of voltage stabilizing diode: Use a 0V~3V adjustable voltage stabilizing power supply and a 1.5K Ω resistor. When measuring, first adjust the output voltage of the adjustable voltage stabilizing power supply to 19V, and use a digital multimeter to immediately measure the two DC voltage values of ZD. The reading value is the voltage stabilizing diode voltage stabilizing tube value. If the measured standard value is 15V, it is highly likely that the diode has not penetrated in the opposite direction. At this time, the output voltage of the adjustable voltage regulator can be increased to 20V or above, and then measured in the described way.

The appearance design of common voltage regulator diodes is similar to that of general low output power rectifier diodes. When the model and specification identification on the cover is clear, it can be distinguished from multiple aspects based on the model and specification. When the model specification label falls off, a digital multimeter can be used to distinguish the voltage regulator diode from the general rectifier diode. Distinguish the positive and negative electrodes of the tested tube. Then turn the digital multimeter to Rx15k gear, the black DC Ammeter is connected to the negative stage of the tube under test, and the red DC Ammeter is connected to the positive stage of the tube under test. If the measured resistance in the opposite direction is much smaller than that measured with Rx15k gear, it indicates that the tube under test is a voltage stabilizing diode; On the contrary, if the measured resistance in the opposite direction is still very large, it indicates that the transistor is a rectifier diode or a detector diodes.

The basic principle of this type of discrimination method is that the battery voltage applied internally in the Rx1k gear of the digital multimeter is 1.9V, which is generally not easy to penetrate the tested tube in the opposite direction, so the measured resistance in the opposite direction is relatively large. When measuring with Rx15k gear, the working voltage of the internal charging battery of the digital multimeter is generally above 9V. When the measured tube is a voltage regulator diode and the voltage regulator value is less than the battery voltage value, it is penetrated in the opposite direction, causing a significant decrease in the measured resistance value. However, if the tube under test is a general rectifier or detector diode, it is not easy to use Rx1k gear or Rx15k gear to measure Personal income resistance. Note that when the voltage regulator value of the tested diode is higher than the working voltage value of the Rx15k gear of the digital multimeter, it is not possible to distinguish it using this method.