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OTDR

Figure 4.3-4-3

Reflectivity: the "reflectivity" box in the threshold parameter can change the

threshold of reflectivity. When "reflectivity" is checked, the test result will be

verified for reflectivity. When the reflectivity in the measurement result is greater

than the set value, the curve judgment will not pass, and the threshold range of

reflectivity is - 80 ~ 0dB.

For example, 1, 4 and 5 in figure (4.3-5) are reflection events (see Appendix A for

the meaning of event type icon), Then the values in the reflectivity column of 1, 4

and 5 will participate in the determination of reflectivity (the principle is consistent

with the determination of welding loss. When the welding loss is set to - 40, the

reflectivity values of event points 1 and 4 are less than - 40, so the reflectivity

column will not be marked in red, while the reflectivity column of event point 5 is

greater than - 40, the reflectivity value will be marked in red (Figure 4.3-5)).

Figure 4.3-5 Event point interface

Diameter distance loss: the "diameter distance loss" box in the threshold

parameter can change the threshold of diameter distance loss. When "diameter

distance loss" is checked, the test result will be verified for diameter distance loss.