All instruments that provide a proportional output signal based on an input or level of energy must be accurately ______?

All instruments that provide a proportional output signal based on an input or level of energy must be accurately ______?

• A. Calibrated
• B. Calibrating
• C. Calibration
• D. Calibrate

Answer: (A)

Proportional output depends on the instrument being in the correct, known condition that reflects a standard. That means it should be accurately calibrated. The phrase uses calibrated as an adjective describing the instrument’s state, indicating it has been adjusted to match a reference so its output truly scales with the input. Using calibrating or calibrate would imply ongoing action or a verb form, which doesn’t describe the instrument’s condition. Calibration is the process, but the instrument must be accurately calibrated to ensure trustworthy proportional output.

Proportional output depends on the instrument being in the correct, known condition that reflects a standard. That means it should be accurately calibrated. The phrase uses calibrated as an adjective describing the instrument’s state, indicating it has been adjusted to match a reference so its output truly scales with the input. Using calibrating or calibrate would imply ongoing action or a verb form, which doesn’t describe the instrument’s condition. Calibration is the process, but the instrument must be accurately calibrated to ensure trustworthy proportional output.