Fluke OF-500-10 Technical Reference Handbook page 124

OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
Setting
LOSS THRESHOLD Lets you set the threshold (in decibels) for reporting loss events. Events at or above the threshold are
(OFTM-573x included in the event table. The range for this setting is 0.01 dB to 1.50 dB inclusive.
modules)
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
Auto on the SET LOSS THRESHOLD screen.
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.
3-50
Table 3-5. Manual OTDR Settings (cont.)
Description and Selection Guidelines
Note
A
Set to