Diode gear and diode measurement method of digital multimeter
The diode gear is a gear that is frequently used. Generally, this gear is found on digital meters. The logo is a diode symbol, and there may be a symbol similar to "signal" around it. For details, please refer to the representation in the above figure.
Turn the multimeter to this gear to see if the above-mentioned "signal" symbol is displayed on the display screen (refer to the above picture). In fact, this is a buzzer gear. If the red and black probes are shorted, you will hear the buzzer sound. This gear can be used to measure the on-off of wires, but today we are talking about another one. Press the switch button on the digital meter to see a diode symbol displayed on the display screen.
Because the red stylus of the digital meter is connected to the positive pole of the internal power supply and the black stylus is connected to the negative pole of the internal power supply, when measuring the diode with the digital meter, put the red stylus on the positive pole of the diode and connect the black stylus to the negative pole of the diode. Under normal circumstances, the positive conduction voltage drop of this diode will be displayed on the display screen, for example, the on-state voltage drop of this diode is 0.607V below.
For a normal diode, the on-voltage drop can be measured, but if the diode is reversed (the red stylus is connected to the cathode of the diode and the black stylus is connected to the anode of the diode), no results can be measured, so the quality of the diode can also be judged by this method. For details, please refer to the measurement results in the following figure.
The diode is measured by taking the ordinary rectifier tube as an example. In fact, this method can basically be used for other types of diodes. For example, the on-voltage drop of LED lamps (light-emitting diodes) can also be measured by using this gear.
How to measure the positive and negative poles of diode with multimeter
1. I can't see the specific model of your multimeter clearly;
2. In general digital multimeter, the measured voltage at diode gear is less than 2V, but you are measuring P6KE36, which is a bidirectional diode. The voltage at diode gear of this diode and multimeter should be at least 6V before measurement, but the diode gear of general digital multimeter can't reach this voltage at all.
3. To put it simply, it is only possible to measure this diode if the voltage between the two probes of the diode is above 6V, and your multimeter can't meet this requirement at all;
4. To measure this diode with your multimeter, you must use a regulated power supply with a voltage of more than 10V, connect a resistor in series, and then connect it in series with this diode to measure whether it is good or bad;
5. As for the series resistance and power resistance, it should be determined according to the normal working current of your diode. I can't give you a specific calculation here.
6. Because the voltage of the diode of your multimeter can't meet the requirements, the positive and negative measurements are not feasible, but it can't prove that the bidirectional diode is broken.
7. To put it simply, this kind of diode can't be measured directly with the diode range of multimeter.
