Fluke Versiv Series Technical Reference Handbook page 448

Versiv Series Cabling Certification Product Family
Technical Reference Handbook
Table 15. Settings for HDR OTDR Tests (continued)
Manual
Settings:
Macrobend
Setup
Bi-directional
Launch
Compensation
412
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. If
the tester does not show a bend, and you suspect that a
bend is increasing the attenuation of a link, you can
decrease the threshold to look for bends that have a larger
radius.
In some cases, the tester can falsely identify a bend when
other events cause a larger loss at longer wavelengths. For
example, a group of hidden events can cause a larger loss
at longer wavelengths. In this case, you can increase the
macrobend threshold to keep the bend event out of your
results.
To use the bend detection function, make sure that
Macrobend Detection on the TEST SETUP screen is set to
On.
This setting shows only if you select SmartLoop OTDR
(Auto) or SmartLoop OTDR (Manual) for the Test Type.
Off: The tester does the SmartLoop test in only one
direction.
On: The tester does the SmartLoop test in both directions
and automatically calculates bi-directional averages of loss.
See "Bi-Directional SmartLoop Tests" on page 473.
The tester will not calculate bi-directional
averages for test results that include splitters.
Tap the control to turn the launch compensation function
on or off. See "About Launch and Tail Cords for OSP Links"
on page 415. This setting does not show for the SmartLoop
test because it is always enabled for that test.
Note