What is the role of a deadweight tester in calibration?

• A. Provide known pressure inputs for calibration.
• B. Provide known temperature references.
• C. Detect noise.
• D. Supply power.

Answer: (A)

The key idea is that a deadweight tester generates known pressure values to calibrate pressure instruments. It does this by placing calibrated weights on a piston with a known cross-sectional area, creating a precise pressure P = F/A (where the force comes from the weights). This known pressure is applied to the device under test so its readings can be compared and adjusted, making the tester a reliable primary standard for pressure calibration.

It’s not used to provide temperature references, detect noise, or supply power. Temperature references come from separate temperature standards, noise detection is a function of measurement electronics and signal processing, and a deadweight tester is not a power source.