How to detect a diode with using a digital multimeter?
1. A method for detecting diodes.
The range switch of the digital multimeter is set to the position marked with the diode symbol, and the red meter pen is changed to insert "V.Ω "socket is then connected to both ends of the diode using two meter pens.
First, positive detection.
When two meter pens forward detection diode is used, if the detected diode is ultraviolet diode and silicon diode, the digital multimeter display has 0. 5~0.8V. Digital display between 8V and 0.25V~0.3V on the display screen of the digital multimeter if the diode being detected is normal diode and germanium tube.
Second, reverse detection.
When a two meter pens is used to reverse detect the diode, if the detected diode is normal, the digital display of "1" on the display screen of the digital multimeter is displayed. If the detected diode is damaged, the display of the digital multimeter has a display of "0000" or other values.
Third, the judgment of polarity.
In the above detection, when there is a connection state of the watch pen showing the value, one end of the red meter pen is the positive pole of the diode and the other end is the negative pole.
Fourth, Good or bad judgment.
At the time of the above tests, if the readings shown in the two tests are large or equally small, both indicate that the diode being detected is bad or damaged.
This article is from Allicdata Electronics Limited.