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Four diodes indicate a full-wave bridge rectifier. In troubleshooting electrical equipment, power supply problems are frequently found, and diode replacement is often the answer. Besides rectification, there are other applications, but these are less frequent offenders because the power levels are less intense. Damage is still a possibility, however, because overvoltage may be applied for a variety of reasons. Applications are inside and outside the power supply proper. Zener diodes take advantage of the avalanche effect.

Visual inspection and ohmmeter tests will often determine the status of the device. If there is any doubt about the condition of the device, replacement is recommended. Some additional diode applications include: • Electronic switching • Envelope detection • Step recovery • Frequency multiplication 5 ,1 ' 287 Figure 1-19â•… Zener diode. Figure 1-20â•… Thyrector. )>> T r o u b l e s h o o t i n g T e c h n i q u e s )>> • Hot carrier devices • Signal mixing • Amplitude limiting • Laser diodes • Photo diodes • Photovoltaic cells • Optical isolators • High-frequency oscillators (Gunn diodes and Tunnel diodes) Sometimes a defective diode can be identified by its burnt appearance, but more often meter tests are needed.

Some models have diode check, capacitor check, and other capabilities. The most basic model reads voltage, resistance, and low-level current. FETs on the front end of the voltage function ensure that the circuit under test will not be loaded to any appreciable degree, so that if it is a high-impedance source that is being tested, the voltage will not be dropped. An inexpensive meter will test up to 600 volts, but great care must be exercised when measuring live circuits. There are several ranges and the idea is to start on a higher range and work down if there is any doubt as to the maximum possible voltage.

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A_62_simplified


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