Chapter 12: The OptiFiber Pro HDR OTDR Module
Settings for HDR OTDR Tests
411
Manual
Settings:
Loss Threshold
Lets you set the threshold (in decibels) for loss (non-
reflective) events. Events at or above the threshold are
included in the event table. The range for this setting is
0.01 dB to 1.50 dB inclusive.
When you select smaller threshold values (0.01 dB to
0.3 dB), the tester makes a trace with less noise. To do this,
the tester makes more measurements to be averaged or
uses wider pulse widths. Thus, smaller values can possibly
increase test times or dead zones.
Auto sets the threshold to a value based on the selected
test limit, usually 0.10 dB. To set the threshold to Auto, tap
Auto on the LOSS THRESHOLD screen.
Notes
When you set a loss threshold, you cannot be sure
that the tester will find all events that are at or
above the threshold. The characteristics of the
fiber and the use of a manual Averaging Time or
Pulse Width can possibly reduce the number of
events the tester finds.
If you set the loss threshold to less than 0.1 dB, the
tester can possibly find many false events caused
by imperfections in the fiber.
-continued-
Table 15. Settings for HDR OTDR Tests (continued)
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