If a frequency counter with a time base accuracy of +/- 0.1 PPM (parts per million) reads 146 520 000 Hz, what is the most that the actual frequency being measured could differ from that reading?

1 part per million (PPM) means the error is one millionth of the measured value. To find the maximum error at 0.1 PPM, you must first determine the value of a single part per million. Divide the measured frequency (146,520,000 Hz) by 1,000,000, which gives 146.52 Hz. This represents exactly 1 PPM. Next, multiply this 1 PPM value by the stated time base accuracy of 0.1. Calculating 146.52 Hz × 0.1 yields a maximum error of 14.652 Hz. The distractors are incorrect due to misplacing the decimal point during the multiplication or division steps.