Fluke CableAnalyzer DSX-5000, Техническое справочное руководство, Страница: 448 / 700

Versiv Series Cabling Certification Product Family
Technical Reference Handbook
412
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. 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
.
Bi-directional
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.
Note
The tester will not calculate bi-directional
averages for test results that include splitters.
Launch
Compensation
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.
Table 15. Settings for HDR OTDR Tests (continued)