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Which instrument shows ignition performance most completely?

  • A.An oscilloscope displaying the secondary waveform
  • B.A multimeter, which measures the resistance of every component and therefore identifies any fault present
  • C.A timing light
  • D.A spark tester with a calibrated gap, which confirms that the system is able to produce a spark of adequate energy

Answer: A

The secondary waveform shows firing voltage, burn time and the condition of the whole circuit. A calibrated gap tester genuinely gives a useful practical check, which makes the last option a real if cruder tool. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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