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Hence the meter should read OL (which is equivalent to open circuit) if the diode is healthy. This is the reverse biased condition of the diode where no current flows through it.

Now reverse the terminals of the meter that means connect the red probe to cathode and black to anode.For germanium diodes this value is in between 0.25 to 0.3. If the displayed voltage value is in between 0.6 to 0.7 (since it is silicon diode) then the diode is healthy and perfect. Observe the reading on the meter display.Connect the red probe to the anode and black probe to the cathode.In this mode multimeter is capable to supply a current of 2mA approximately between the test leads. Keep the digital multimeter (DMM) in diode checking mode by rotating the central knob to the place where the diode symbol is indicated.Identify the diode terminals (anode and cathode).Diode Mode Testing Step by Step Instructions: The diode testing using a digital multimeter (DMM) can be carried in two ways as there are two modes available in DMM to check the diodes such as diode mode and ohmmeter mode. Testing of a Diode using Digital Multimeter If the meter fails to show above readings, then the diode is said to be defective or bad.If the meter indicates OL or a very high resistance, then it refers to the perfect condition of the diode.In this case, the diode is said to be in reverse bias. Now put the selector in high resistance position and reverse the terminals of the meter by connecting positive terminal to the cathode and negative terminal to anode.If the meter indicates a low resistance value, then it says that the diode is healthy.Connect the positive terminal of the diode to the positive terminal of the multimeter.Connect the negative terminal of the diode to the negative terminal of the multimeter.Set the multimeter selector switch in low resistance value.

Testing of a Diode using Analog Multimeter Step by Step Instructions: The method of testing a diode with an analog meter is quite straightforward. Just two tests are needed with the multimeter to ensure that the diode works satisfactorily. The basic diode test is very simple to perform.