A: For a digital meter to test a diode it must have a scale for resistance for it to work, If not a 1.25 v cell with series limiting resistor will work. If you measure across the diode the reading should be .7 volts reverse the cell polarity then the diode voltage should be 1.25 v .7v is forward voltage 1.25 is reverse voltage.
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When testing a diode with dmm in diode test mode 0.6v is delivered through the device to indicate continuity
the diode will have two polarities anode and cathode .take multimeter and set it in buzer mode or resistance mode and connect the positive terminal of multimeter to anode of diode and negative to the cathode the multimeter shows the resistance say 500-700ohms if it working and doesn't show any impedance i.e, very high impedance in reverse bias i.e, by connecting the positive terminal of multimeter to cathode of diode and negative terminal to anode,and in no working condition it shows same characteristics as in reverse bias connected. the simple way of checking diode is connect the 2v led in series with the diode to the battery of 3v the led will glow if the diode is connected in forward bias in circuit and it doesn't glow if the diode is connected in reverse bias in circuit /diode is damaged . A: a diode will conduct from cathode [negative ] to anode [positive] A stripe at one end is the cathode or a stripe on the arrow is the cathode. By applying the proper voltage it will conduct and show low resistance and a voltage from .6v to .7v. Reversing the lead it will show relatively hi resistance.
Use a multimeter or digital multimeter and set it to the ohmmeter mode. Put the test leads on the speaker terminals. It won't be perfect, but if it says 1.8 ohms or so then it's a 2 ohm speaker.
Transistor will be in OFF mode.
Transistor will be in OFF mode.
Transistor will be in OFF mode.
cutoff
If your multimeter has a transistor check (hfe), then place the Collector,Base& Emitter in the CBE port of multimeter. Turn the shaft to Diode mode. If the value is zero,skip that transistor. You can use the forward resistance of each junction, using the ohms range or diode check function. Put the leads on the Base and Emitter, then reverse the leads. You should get about 600Ohms forward bias and open circuit (infinity) reverse bias. Do the same between the Base and Collector. You should get the same results. Finally put the leads between the Collector and Emitter. You should get open circuit both ways around. Be aware that some high power transistors have a diode across the Emitter and Collector. These tests will just be a basic 'go - no go' test. It may pass this test and yet still not perform fully. You can see obvious faults, like a dead short both ways on each junction or across the Emitter to Collector.
You need an ohmmeter or multimeter (set in resistance measurement mode). Choose the 1kOhm range. Connect the meter's wires (red & black) each to the diode's terminals, then switch the terminals. In one case you should see a meter reading that is substantially lower than the other. If that is not the case (both read high or both read low), the diode is probably faulty.
by noticing the polarity of theohmmeter a diode can be checked for continuity and blocking ability However it will not tell you how good or bad the device itself is BY keeping the multimeter in diode mode and keeping properly the positive and negative terminals of the multimeter. If the diode is good multimeter will show a reading of 0.5 else there will be a short.
by using a suitable diagram, explain the one of the operation in microwave energy sources except Guinn Diode.
If the meter is developing more than the necessary forward breakdown voltage of the diode, typically 0.7 volts, then the diode is bad. However, some meters do not generate enough voltage in resistance mode to bias the diode on, unless you flip a switch that enables diode test mode. Use another meter at the same time to measure the voltage across the diode and compare that with the diode's published forward breakdown voltage.