Fluke OF-500 OptiFiber, Technical Reference Handbook

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OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
3-50
Table 3-5. Manual OTDR Settings (cont.)
Setting Description and Selection Guidelines
LOSS THRESHOLD
(OFTM-573x
modules)
Lets you set the threshold (in decibels) for reporting loss 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.
For smaller threshold values (0.01 dB to 0.3 dB), the tester reduces noise on the trace by taking more
measurements for averaging or by using wider pulse widths. Therefore, smaller values may increase test
times or deadzones on the trace.
Auto sets the threshold to the default value of 0.1 dB. To set the threshold to Auto , press
A
Set to
Auto on the SET LOSS THRESHOLD screen.
Note
Setting a loss threshold does not guarantee that all events at or above the threshold will be
found. The fiber's characteristics or using a manual
AVERAGING TIME or PULSE WIDTH may also
limit which events are found.
If the loss threshold is set to less than 0.1 dB, the tester may find many false events due to
inherent imperfections in the fiber.