Fluke OF-500-01 OptiFiber, Technical Reference Handbook, Page: 125 / 278

Using the OTDR
Using Manual OTDR Mode
3-49
3
Table 3-5. Manual OTDR Settings (cont.)
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.
Setting Description and Selection Guidelines
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.