Versiv Series Cabling Certification Product Family
Technical Reference Handbook
316
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.
Manual
Settings:
Macrobend
Setup
Enter the threshold for the difference in an event’s loss
between the two wavelengths shown.
To identify a loss event as a bend, the tester compares the
event’s loss at two wavelengths, such as 1310 nm and
1550 nm. If the loss is more at the longer wavelength and
is more than the macrobend threshold, the tester identifies
the event as a bend.
The default threshold for the loss difference is 0.50 dB.
To use the bend detection function, make sure that
Macrobend Detection on the TEST SETUP screen is set to
On.
Note
Macrobend detection is available only for
singlemode fibers.
Table 12. Settings for OTDR Tests (continued)
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