The Hdtdr Analyzer - Fluke Versiv Series Technical Reference Handbook

Versiv Series Cabling Certification Product Family
Technical Reference Handbook

The HDTDR Analyzer

While return loss test results shows return loss relative to
frequency, the HDTDR
Reflectometry) analyzer shows return loss relative to its distance
from the tester. The HDTDR plot shows the locations and
amplitudes of return loss signals to help you find the causes of
return loss failures.
After an Autotest on twisted pair cable, you can see HDTDR plot if
the Autotest had a FAIL, FAIL* or PASS* result, or if HDTDX/
HDTDR on the TEST SETUP screen was set to All Autotests when
you did the test.
For tests on coaxial cable, the HDTDR plot is always available after
an Autotest.
To see the HDTDR plot for an Autotest, tap the DIAGNOSTIC tab
or the FAULT INFO tab on the Autotest results screen, then tap
HDTDR ANALYZER. Figure 85 shows an example of an HDTDR plot
for twisted pair cable. Figure 86 shows how some common faults
appear on HDTDR plots. Figure 87 shows an HDTDR plot for
coaxial cable.
To get HDTDR analyzer results you can also tap Tools >
Diagnostics.
If Store Plot Data is off, the tester does not include
the HDTDR plot with results you save.
Refer to Figure 85:
The vertical scale shows the percentage of the signal reflected

back to the main tester. The amplitudes of signals on the plot
show how much the impedance of the cabling changes.
 The measurement cursor. The box at the bottom of the cursor
shows the distance from the start of the cabling to the cursor.
194
™
(High-Definition Time Domain
Note