To avoid misleading readings when testing...

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Question 1 of 2066636eed28f7522a1c51d36d

To avoid misleading readings when testing the discrete semiconductor components of a printed circuit board when testing it with a volt-ohmmeter, what practice or practices should be avoided? I. Using resistance scales requiring high power II. Forward biasing of junctions or reversing polarity of the leads

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🔍 Key Concepts

• Effect of ohmmeter test current on delicate semiconductor junctions (diodes, transistors) • Difference between low-power resistance ranges and high-power resistance ranges on a volt-ohmmeter • What happens to PN junctions when they are forward-biased or when meter polarity is reversed during testing

💭 Think About

• For a small transistor or diode on a circuit board, what could happen if you use a resistance range that pushes relatively high current through that device? Would that give a clean measurement, or could it damage or falsely switch the device on? • If you deliberately forward-bias a semiconductor junction with your meter, are you still measuring its normal resistance, or are you now measuring a turned-on device that may affect the rest of the circuit path? • Think about whether simply reversing the meter leads across a semiconductor junction changes how it behaves (forward vs reverse bias) and whether that could confuse your reading or stress the component.

✅ Before You Answer

• Check whether high-power resistance ranges can drive enough current/voltage to alter or damage small semiconductor junctions. • Check whether forward-biasing PN junctions during a resistance check can cause them (and parallel paths) to conduct, giving misleading resistance readings. • Decide if either practice is something you would intentionally avoid when you want accurate, non-destructive tests of semiconductors on a circuit board.

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