Which of the following is NOT an acceptable indication during an electromagnetic interference test on an electronic scale?

The correct answer identifies an indication that is not acceptable during an electromagnetic interference test on an electronic scale. When conducting such a test, the primary objective is to evaluate the scale's performance in the presence of electromagnetic disturbances. An acceptable result would show minimal difference between the weight indications when the disturbances are present and when they are absent. This ensures that the scale remains accurate and reliable even under interference.

The choice highlighting a difference of 2 scale divisions suggests that the scale's readings fluctuate significantly when exposed to electromagnetic interference. A difference this large typically indicates a failure in the scale's ability to maintain accurate measurements in challenging conditions, which would be unacceptable for a reliable weighing instrument.

In contrast, the other options reflect standard practices or acceptable conditions for an electromagnetic interference test. Measurements being within applicable tolerances ensure the scale meets regulatory standards, and conducting the test under normal operational conditions while the scale is powered on mimics realistic scenarios in which the scale would be used. This ensures that the findings of the test are relevant and applicable to everyday use.