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The setting that should exceed the length of the span under test is the range. This configuration determines the maximum distance that the Optical Time Domain Reflectometer (OTDR) can accurately measure. By setting the range higher than the length of the fiber span, the OTDR can capture all of the reflections and events along the fiber, ensuring a complete and accurate trace.

If the range is set lower than the span length, the OTDR may not have sufficient capability to detect events that occur throughout the entire length of the fiber, possibly leading to missed faults or loss measurements. This is crucial because accurate troubleshooting and maintenance decisions depend on obtaining comprehensive data from the entire fiber span.

The other settings, such as pulse width, resolution, and sampling rate, have their own specific functions but do not directly correlate with ensuring that the OTDR can cover the full length of the span under test. While these settings contribute to the quality and detail of the measurement, it's the range that fundamentally ensures the device can handle the entire distance of the fiber being tested.