Question 15 of 20 : Select the best answer for me question. 15. Two electronics technicians are comparing the advantages and disadvantages of analog and digital multimeters. Technician A says that an analog meter has greater accuracy and stability than a digital meter. Technician B says that an analog meter can track a varying signal better than a digital meter. Which of the following statements is correct? 0 A. Neither of the two technicians is correct. 0 B. Only Technician B l8 correct. 0 C. Both of the technicians are correct. 0 D. Only Technician A is correct.
The correct answer and explanation is:
The correct answer is: B. Only Technician B is correct.
Explanation:
An analog multimeter and a digital multimeter each have unique advantages and disadvantages based on their design and application. Let’s analyze the statements made by Technician A and Technician B.
Technician A’s Claim:
“An analog meter has greater accuracy and stability than a digital meter.”
This statement is incorrect. Digital multimeters (DMMs) are generally more accurate and stable than analog meters. Digital meters can provide higher resolution and precision due to their digital circuitry. In contrast, analog meters rely on a moving needle and mechanical components, which can introduce errors due to parallax (the angle from which the scale is viewed), wear and tear, or calibration drift. For most applications requiring high accuracy, a digital multimeter is preferred.
Technician B’s Claim:
“An analog meter can track a varying signal better than a digital meter.”
This statement is correct. Analog meters are better at showing trends or changes in a signal because their needle provides a continuous visual representation of the signal’s variation. This makes them particularly useful for observing rapidly fluctuating signals, as the human eye can easily track the movement of the needle. Digital meters, on the other hand, update their display at discrete intervals (often 2-4 times per second), making it difficult to interpret rapidly changing signals accurately.
Why Technician B is Correct:
While digital multimeters dominate in terms of accuracy and stability, analog meters are advantageous for specific tasks like monitoring fluctuating signals or observing transient changes. Technician B accurately highlights the strength of an analog meter in these scenarios, while Technician A’s claim is inaccurate based on modern instrumentation standards.
In summary, Technician B’s understanding of the analog meter’s capability to track varying signals is accurate, making B the correct answer.