Digital multimeter diode gear measurement of diodes
With a digital multimeter diode file to measure the diode forward and reverse resistance (voltage drop) can quickly determine the good and bad of various diodes. The following describes the specific measurement method.
Measure the forward resistance of the diode.
Measure the diode good or bad, the first digital multimeter range switch to the diode file, and then use the red and black pens to contact the diode's positive and negative poles (general diode shell with a colour ring on the pin for the negative), at this time for the good silicon diode, the multimeter display readings are generally in the range of 0.500 to 0.700 (the specific size of the diode and the diode type and multimeter test current is related); For a good Schottky diode and germanium diode, the multimeter display reading is generally in the 0.150 ~ 0.300. The figure above shows the multimeter measurement of a good silicon rectifier diode display reading.
When measuring the forward resistance of a diode, if the multimeter shows a reading of "0.00" or "OL (overflow)", the diode is damaged.
Measure the reverse resistance of the diode.
After measuring the forward resistance of the diode, and then switch the red and black pens, with the red pen contact diode negative, black pen contact diode positive, as shown in the figure above. At this time for a good diode, the multimeter display readings are generally "OL".
In the multimeter to measure the diode's forward and reverse resistance, if a diode shows the positive and negative readings are "0.00" or are "OL", it means that the diode has been damaged.
