Jul 08, 2016 · A multimeter can be used as a fast and simple way to check a diode out of the circuit. A good diode will show an extremely high resistance (ideally an open) with reverse bias and a very low resistance with forward bias. A defective open diode will show an extremely high resistance (or open) for both forward and reverse bias.
A multimeter is a device that measures electrical voltage, current and resistance. The uses of multimeters include finding faulty components in electronic circuits, testing residential circuitry and looking for breaks in circuit cables. You can also use a multimeter to test batteries and diodes.
How to test a rectifier with a multimeter
Step by step instructions: Set the meter to its ohms range - any range should do, but the middle ohms range if several are available is probably best. Connect the cathode terminal of the diode to the terminal marked positive on the multimeter, and the anode to the negative or common terminal.
To test the rectifier, you will need to disconnect all of the wires and turn your multimeter to the diode function. First, check the positive diode. To do this, place the positive lead into the positive diode. Then connect the negative lead to each of the stator inputs. The meter should not read anything on any of these.
These scales determine how much current the multimeter will use during the test. For example, my multimeter has scales for 200 ohms, 2 K ohms, 200 K ohms, 2 M ohms, and 20 M ohms. If I were to ...