Yamasaki Y30 Series User Manual page 24

Test the curve again with big attenuation with current pulse width set (select the average
test mode and set certain average times in this case).
 Event points are too close with each other in the test curve.
In case of any adjacent event points being omitted, try to solve the problem as follows:
Test the curve again with small pulse width (select the average test mode and set certain
average times in this case).
Set certain average times and conduct the test in the average mode, so as to rise the
curve SNR.
 Poor test curve SNR
Any poor test curve SNR can affect the curve analysis accuracy. Try to solve the problem as
follows:
Increase the average times properly in the auto test or average test mode.
In the average test mode, set proper test range, and test again with large test pulse width.
 Improper OTDR test parameters set
In case of any big difference between such values and the optical fiber length and the actual
ones, please check the following:
Whether the refractive index and optical cable correction factor set are consistent with
the nominal ones of the optical fiber or optical cable under test.
If no, it will severely affect the measured length of the optical fiber under test.
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