Table 5-1 Component Listed Value 330 Ω R₁ R₂ 1 ΜΩ Diode forward resistance Diode reverse resistance Table 5-2 Forward-biased 0.610 Reverse-biased OL V for (measured) 0.35 V 0.40 V 0.45 V 0.50 V 0.55 V 0.60 V 0.65 V 0.70 V 0.75 V 0.80 V Vrev (measured) 0.50 V 1.00 V 1.50 V Table 5-3 VRI (measured) 0.0032 V 0.007 V 0.0237 V 0.047.8 0.116 V 0.677v 1.090V 2.840V 6.360 7.250 V Measured Value 329.7 0.986 M 19.76k OL Table 5-4 VR2 (measured) 58mV 113mV 164.3mV Ifor (computed) 9.697м А 21.21MA 71.824A 144-810 351-5MA 2052MA 3303 MA 8610 MA 19270 MA 21 атома Irev (computed) 5.8 X10A 1.16X107A 1.643 хота
Conclusions: Review Questions: 1. Base on the results of Table 5-1, is the diode in good condition? Briefly explain. 2. Base on the results of Table 5-2, is the diode in good condition? Briefly explain. 3. Explain how you could use an ohmmeter to identify the cathode of an unmarked diode. Why it is necessary to know the actual polarity of the ohmmeter leads?
4. A student measures the resistance of an unmarked diode with an ohmmeter. When the (+) lead of the ohmmeter is connected to lead 1 of the diode and the (-) lead of the ohmmeter is connected to lead 2 of the diode, the reading is 400 Q. When the ohmmeter leads are reversed, the reading is oo. Which lead on the diode is the anode? 5. (a) Figure 5-4 For the circuit shown in Fig. 5-4, determine if there is a fault for each of the following conditions. If so, state what the most likely problem is. The voltmeter reads zero; the ammeter reads 3.0 mA 10 V (c) R = 3.3 ΚΩ (b) The voltmeter reads +10 V; the ammeter reads zero. (d) The voltmeter reads 0.7 V; the ammeter reads 2.8 mA. Both the voltmeter and the ammeter read zero.
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