Practice Test Geeks(CST) Certified Scale Technicians Practice Test
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Analog & Digital Scale Technology 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 Analog & Digital Scale Technology flashcards as text

  1. Which calibration method applies when test weights of sufficient accuracy are physically placed on a scale to establish its span?

    Answer: Deadweight calibration

    Deadweight (or static weight) calibration uses certified test weights placed directly on the scale platform to set the span, providing the highest accuracy traceability.

  2. The term 'tare' on a digital scale refers to:

    Answer: Zeroing the scale with a container on it to weigh only the contents

    Tare subtracts the weight of an empty container from the display so that subsequent readings show only the net weight of the contents placed inside.

  3. A digital floor scale connected to an indicator shows correct readings, but the indicator's serial output to a printer is sending incorrect weight values. The most likely cause is:

    Answer: Baud rate or data format mismatch between indicator and printer

    Serial communication errors between a scale indicator and a peripheral are almost always configuration mismatches in baud rate, data bits, parity, or stop bits.

  4. What is 'minimum dead load' (MDL) in the context of scale testing?

    Answer: The smallest load required before the scale begins to respond

    Minimum dead load (also called minimum load or Min) is the smallest load for which the scale's weighing result is considered metrologically acceptable.

  5. Electromagnetic compatibility (EMC) shielding on a digital scale cable is important primarily because:

    Answer: It protects the low-level mV load cell signal from radio frequency and electromagnetic interference

    Load cell output signals are very small (in the millivolt range), making them highly susceptible to RFI/EMI noise that shielding helps block.

  6. In NIST Handbook 44, the 'maintenance tolerance' for a commercial scale is:

    Answer: Equal to the acceptance tolerance and applied to scales already in service

    Maintenance tolerances are the same as acceptance tolerances under NIST Handbook 44 and apply to scales already placed in service during field inspections.

  7. Which phenomenon causes a digital scale to display a weight value that differs from the true load when a vibrating conveyor is positioned nearby?

    Answer: Mechanical resonance induced noise corrupting the A/D sampling

    Vibration from nearby equipment induces mechanical oscillation in the load cell flexure, adding noise to the signal and causing the A/D converter to sample incorrect values.