Practice Test Geeks(CWT) Certified Weighing Technician Practice Test
← All CWT Flashcard Decks

Measurement Standards & Accuracy Flashcards

7 cards from real CWT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Measurement Standards & Accuracy flashcards as text

  1. Under NIST Handbook 44, what is the 'acceptance tolerance' compared to the 'maintenance tolerance'?

    Answer: Acceptance tolerance is tighter and applies to newly installed scales

    Acceptance tolerances are tighter and apply when a device is first put into service; maintenance tolerances are more lenient for devices already in use.

  2. What is the purpose of a 'sensitivity test' on a mechanical beam scale?

    Answer: To determine the smallest weight increment that causes a visible change in balance

    A sensitivity test determines the minimum additional weight that causes a detectable movement of the beam, indicating the scale's resolution.

  3. What does 'eccentricity error' (also called 'off-center loading error') measure?

    Answer: Error caused by placing the load off-center on the platform

    Eccentricity error is the difference in readings when the same load is placed at different positions on the weighing platform.

  4. Which OIML class of weights has the most stringent tolerances?

    Answer: E1

    OIML E1 weights have the most stringent tolerances and are used as primary reference standards.

  5. A scale displays '±1d' as its division value. If d = 0.01 lb, what is the maximum permissible error for a Class III scale at mid-range?

    Answer: It depends on the specific load applied

    Under NIST Handbook 44, the MPE for Class III scales depends on the number of scale divisions at the applied load, so the specific load must be known.

  6. What is the function of a 'check weight' used during a weighing operation?

    Answer: To verify the scale is still reading within tolerance during a production run

    A check weight is a known reference weight used periodically during production to confirm the scale has not drifted out of tolerance.

  7. In gravimetric calibration, what correction must be applied when using mass standards at a location with different gravitational acceleration than where the standards were calibrated?

    Answer: Gravity correction to account for local g variation

    Although mass is invariant, a scale measures force (weight = mg), so local gravitational acceleration differences must be corrected in high-precision work.