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USEFUL FORMULA 44 AVE

USEFUL FORMULA 44 AVE

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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USEFUL FORMULA 44 R₁ - FIGURE 1-1 Graphic determination of diode forward resistance. رلا The determination of Rf, the diode forward resistance, is shown graphically in Figure 1-1. R₁ AV ولد PROCEDURE 1. Very often one can use a VOM to check quickly whether a diode is good or bad. Unless they have a specific function for this pur- pose, most DMMs are not able to perform this test properly. Using your VOM as an ohmmeter, first select a low-resistance meter range, such as the "R × 100" range. Then connect the positive lead of the VOM to the diode's anode terminal while the negative lead is connected to the diode's cathode termi- nal, as shown in Figure 1-2A. (Most diodes have a single col- ored band, several bands, the diode symbol, or the letter "K" at one end to indicate the cathode terminal.) The VOM's inter- nal battery then forward biases the diode. Note the resistance reading. If a DMM with a " diode check" feature is used, the dis- play usually indicates the voltage drop across a good diode from anode to cathode when it is forward biased. When reverse bi- ased, the DMM generally indicates some form of out-of-range condition, such as a blinking display or the letters "OL."
Transcribed Image Text:USEFUL FORMULA 44 R₁ - FIGURE 1-1 Graphic determination of diode forward resistance. رلا The determination of Rf, the diode forward resistance, is shown graphically in Figure 1-1. R₁ AV ولد PROCEDURE 1. Very often one can use a VOM to check quickly whether a diode is good or bad. Unless they have a specific function for this pur- pose, most DMMs are not able to perform this test properly. Using your VOM as an ohmmeter, first select a low-resistance meter range, such as the "R × 100" range. Then connect the positive lead of the VOM to the diode's anode terminal while the negative lead is connected to the diode's cathode termi- nal, as shown in Figure 1-2A. (Most diodes have a single col- ored band, several bands, the diode symbol, or the letter "K" at one end to indicate the cathode terminal.) The VOM's inter- nal battery then forward biases the diode. Note the resistance reading. If a DMM with a " diode check" feature is used, the dis- play usually indicates the voltage drop across a good diode from anode to cathode when it is forward biased. When reverse bi- ased, the DMM generally indicates some form of out-of-range condition, such as a blinking display or the letters "OL."
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