Ham Radio General Class Practice Test

What is an advantage of a digital voltmeter as compared to an analog voltmeter?

1. Better for measuring computer circuits

2. Better for RF measurements

3. Better precision for most uses

4. Faster response

The correct answer is: Better precision for most uses

The advantage of a digital voltmeter compared to an analog voltmeter is indeed better precision for most uses. Digital voltmeters provide a numerical display of the voltage measurement, which allows for a more precise reading than the scale of an analog voltmeter. This precision is particularly beneficial in applications where small voltage variations need to be measured accurately. Digital voltmeters are less prone to user interpretation errors associated with reading scales on analog meters, as they eliminate parallax error that can occur when viewing the needle on an analog display. The resolution of digital displays can often show several decimal places, enabling the user to discern smaller changes in voltage, which is especially important in many electronic and scientific applications. While factors such as speed of response, suitability for RF measurements, and compatibility with computer circuits are also relevant considerations, the defining characteristic that sets digital voltmeters apart is the precision they offer in voltage measurement, which makes them a preferred tool in many circuits and testing scenarios.