Fluke CableAnalyzer DSX-5000, Technical Reference Handbook, Page: 445 / 700

Chapter 12: The OptiFiber Pro HDR OTDR Module
Settings for HDR OTDR Tests
409
Manual
Settings:
Pulse Width
Adjust the pulse width to a wider setting to see farther
down the fiber or to a narrower setting for better
resolution.
Narrower pulses let you see more detail in and around
reflective events and help you see events that are close
together (hidden events). But narrower pulses reduce the
range of the OTDR and make traces that have more
background noise between events. When you use
narrower pulses, small loss events can possibly be hidden in
the noise on the trace.
Wider pulses increase the backscatter level, which gives a
better signal-to-noise ratio around non-reflective events.
This helps you see smaller loss events and measure their
loss more accurately, but increases the dead zones of
events. Wider pulses can also hide small reflections.
Auto
: The tester selects the narrowest pulse that still lets
you see loss events.
Manual
Settings:
Averaging
Time
The averaging time is the time the tester uses to make
measurements and calculate averages of the
measurements.
Auto
: The tester adjusts the test settings to give a good
view of events on the trace while it keeps the test time to a
minimum.
Quick Test :
The tester adjusts the test settings to keep the
test time to a minimum. This setting decreases accuracy,
increases dead zones, and can give a trace that shows
fewer details. Use this setting to do a test quickly when it is
not necessary to see small details on the trace.
A
Quick Test
can possibly take up to 3 minutes if the fiber
length is near the maximum range for the tester for the
selected pulse width.
Note
The Quick Test may not give good results for links
with splitters that have ratios greater than 1:4.
The tester may need long test times to give good
results on such links.
-continued-
Table 15. Settings for HDR OTDR Tests (continued)