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Once the test is complete, check the position of the orange dotted line, which is the end-of-fiber marker.

If this line is not where it should be, e.g. perhaps on an echo, then you can position the end-of-fiber marker manually by using the EOF soft key.

To set the end-of-fiber marker, make sure only one cursor is selected, then simply move that cursor to the appropriate end-of-fiber position. Then press the EOF soft key twice.

This will ensure that the fiber length used for the certification test is correct.