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A repeated reading on a stable reference can reveal a change in the measuring setup during a run.

Check the reference at the start and again at the end, using the same method and positioning. A difference large enough to exceed the established check limit gives the team a reason to review the part readings taken between those checks.

Choose a reference that exercises the setup

Use a stable reference suited to the dimension, instrument and fixture. A known artifact that resembles the measurement task can reveal effects a simple zero check misses. Record the reference identity, observed readings and relevant conditions. Use past readings to establish what normal variation looks like for that setup.

Decide what to do if the check changes

Look for changes in seating, temperature, setup or instrument condition. Determine which results could be affected and repeat those measurements after the setup has been checked. Similar readings at the two endpoints do not rule out a temporary change in the middle. For longer runs, add intermediate checks where the risk warrants them.

Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information at sambound.com.

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SamBound New Material Technology Company Ltd.

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