Testing diodes is unique in relation to testing a resistor since you want an expertise to make it happen. In the event that you do not have the foggiest idea or wrongly test a diode you will not be able to fix the hardware. A terrible diode you think it is great. This will burn through your valuable time. A rectifier diode can bomb in one of the four different ways. It can turn into:
- Open
- Shorted
- Cracked
- Breakdown when in full working voltage
To the anode, the diode is converse one-sided and ought to seem to be an open perusing. Interfacing the red test of your meter to the cathode and dark test to the anode, the diode is forward one-sided and the meter ought to peruse some worth of obstruction. In the event that you have two readings, most presumably the diode is shorted or flawed and you ought to supplant it. In the event that you get no perusing either forward or turn around predisposition, the diode is viewed as open. The genuine issue while checking a diode utilizing the diode test capability of a computerized meter is that an open or broken diode, the meter some of the time peruses ok (0.6). This is because of computerized meter diode test yield voltage (which you can gauge the result test utilizing another meter) is around 500mv to 2v. A simple meter set to x1 ohms have yield around 3V (remember the two 1.5V battery you introduced in the meter!). The 3V voltage is sufficient to show you the exact perusing photodiode array detector when under test. Regardless of whether you have a decent perusing at x1 ohms does not imply that the diode is great.
- Presently need to set your meter to x10K to test the diode once more. The result voltage of
- X10k ohms is around 12V (remember the 9v battery in your meter-1.5v+1.5v+9v=12v). Once more
- The diode under test ought to show just a single perusing. This is special case for Schottky diode
- Where it has two readings however not shorted perusing. On the off chance that the meter showed one perusing,
- The diode under test is great. On the off chance that it has two readings, most likely the diode is by the same token
- Shorted or cracked. The advanced meter cannot test it in light of the fact that the result from the meter is as it were 500mv to 2V.
On the off chance that a diode breakdown when under full working voltage, it is basically impossible to testing diode except if you have a pricey diode checker which extraordinarily intended to find this kind of problem. Substituting with a realized decent diode is much of the time the best way to demonstrate that an irregular diode is causing a specific issue. Here and there an irregular diode could be finding utilizing a coolant shower.
