Apparatus and assembly
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Flip to reveal answersHow is each multimeter range connected?
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All 4 Flashcards — Apparatus and assembly
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Question
How is each multimeter range connected?
Answer
Voltage across the component with the circuit running; current in line with the circuit broken; resistance with the power off and one end disconnected.
Question
Why is an ammeter dangerous across a supply?
Answer
It has a very low resistance, so it becomes a short circuit. That is why the current socket is separate and fused on almost every meter.
Question
What can an oscilloscope show that a multimeter cannot?
Answer
Frequency, waveform shape, pulse width and duty cycle, and short glitches. A steady 2.5 V and a 0-5 V square wave read identically on a meter.
Question
How do you read a value from an oscilloscope?
Answer
Count divisions and multiply by the setting: four divisions at 2 V/div is 8 V; a cycle across five divisions at 1 ms/div is 5 ms, which is 200 Hz.
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Topic 7.4 hub
Electronic systems applied
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