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Repeatability & Linearity Testing Flashcards

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

Read the first 7 Repeatability & Linearity Testing flashcards as text

  1. When performing a repeatability test, the test load should be applied and removed how many times according to NIST HB 44?

    Answer: 5 times minimum

    NIST HB 44 requires a minimum of 5 repeated load applications to properly evaluate repeatability error.

  2. A scale tested for linearity shows increasing error as load increases. This pattern is best described as:

    Answer: Progressive nonlinearity

    Progressive nonlinearity describes errors that systematically increase or change in magnitude across the measurement range.

  3. Which of the following best defines the 'best straight line' method used in linearity analysis?

    Answer: The line that minimizes the maximum deviation of any data point

    The best straight line minimizes the maximum deviation (peak error) between actual scale output and the ideal reference line.

  4. During a linearity test on a 500 lb capacity scale, readings at 100, 200, 300, and 400 lb are all within tolerance, but the 250 lb reading is out of tolerance. This indicates:

    Answer: A mid-range nonlinearity

    An out-of-tolerance reading at a mid-range point while endpoints are correct indicates a mid-range nonlinearity in the load cell or mechanism.

  5. Repeatability testing on a conveyor belt scale should be performed at what percentage of the scale's maximum capacity?

    Answer: At least 50% of max capacity

    Conveyor belt scale repeatability tests are typically conducted at loads of at least 50% of maximum capacity to produce meaningful results.

  6. A technician finds that a scale's repeatability error exceeds the tolerance. The FIRST corrective step should be to:

    Answer: Check for mechanical interference or binding

    Mechanical interference or binding is the most common cause of poor repeatability and should be investigated before replacing components.

  7. For NTEP-certified scales, linearity tolerance is typically expressed as a multiple of:

    Answer: The verification scale division (e)

    NTEP linearity tolerances are expressed in terms of the verification scale division (e), which may equal or be larger than d.