Parallax error is best described as what kind of reading issue?

Parallax error is best described as what kind of reading issue?

• A. An incorrect read on an analog meter caused by viewing from an angle that misaligns the needle
• B. A read error caused by power supply noise
• C. A digital display that momentarily freezes
• D. A miscalibration due to ambient temperature

Answer: (A)

Parallax error happens when you read an analog gauge from an angle rather than straight on, so the needle and the scale aren’t aligned in your view. Because the scale and the pointer are on different planes, looking from the side can make the reading appear higher or lower than the true value. To avoid this, read the dial at eye level, directly in line with the needle, or use a gauge designed to minimize parallax. The other options describe different issues (noise causing fluctuations, a digital display freezing, or temperature-caused drift) that aren’t about misreading due to viewing angle.

Parallax error happens when you read an analog gauge from an angle rather than straight on, so the needle and the scale aren’t aligned in your view. Because the scale and the pointer are on different planes, looking from the side can make the reading appear higher or lower than the true value. To avoid this, read the dial at eye level, directly in line with the needle, or use a gauge designed to minimize parallax. The other options describe different issues (noise causing fluctuations, a digital display freezing, or temperature-caused drift) that aren’t about misreading due to viewing angle.