Discussion
Consider the following statements about audit instruments.
1. An averaging clamp meter reads low on a distorted current 2. An infrared thermometer needs the emissivity to be set 3. A spot reading is adequate for a varying load
Answer: C
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: an averaging meter is calibrated for a sine wave and under-reads a distorted current, so a true RMS instrument is needed wherever drives or electronic loads are present; and an infrared thermometer computes temperature from radiance, so the emissivity setting must match the surface. Statement 3 is wrong - a varying load needs logging over a representative period, since a spot reading captures one moment of it.
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