If a digital multimeter is setup as shown in...

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Question 1 of 2066636eed28f7522a1c51d4c7

If a digital multimeter is setup as shown in figures "A" and "B" to test a silicon diode, what is the status of the diode if the screen displays 0.70 V when configured as in figure "A" and displays OL V when configured as in figure "B"? Illustration EL-0212

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Question 1 of 20

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🔍 Key Concepts

• Typical forward voltage drop of a silicon diode when forward-biased on the diode-test setting of a digital multimeter • Meaning of an OL (overload/open loop) indication on a multimeter in diode-test mode • Difference in readings between a shorted, open, and normal diode when you reverse the test leads

💭 Think About

• In figure A, is the diode forward-biased or reverse-biased with respect to the meter’s internal test voltage? What does a reading of about 0.70 V usually indicate for a silicon junction? • In figure B, why would the same diode now read OL with the leads swapped? What would you expect to see if the diode were shorted, and what would you expect if it were open, in both directions? • Compare the two measurements together: one direction shows a specific junction voltage, the other shows OL. Which failure mode (shorted, open, intermittent) would give different indications than this?

✅ Before You Answer

• Verify what a good silicon diode should read in forward bias (approximate voltage value) and in reverse bias (OL or very high resistance) on the diode-test function. • Check what a shorted diode would read in both directions (think: close to 0.00 V or very low resistance), and what an open diode would read in both directions (OL in both tests). • Confirm that “intermittently open” would give readings that change or are unstable rather than two consistent, repeatable readings as shown.

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