Fluke DTX-1800 Technical Reference Handbook page 208

DTX Series CableAnalyzer
Technical Reference Handbook
Setting
Loss Threshold User Defined lets you set the threshold (in decibels) for reporting loss events. Events at or above the
(Auto or User threshold are included in the event table. The range for this setting is 0.01 dB to 1.50 dB inclusive.
Defined)
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 0.10 dB for multimode and 0.15 dB for singlemode.
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 below the default value, the tester may find many false events due to
inherent imperfections in the fiber.
7-50
Table 7-5. Manual OTDR Settings (cont.)
Description and Selection Guidelines
Note