Fluke Networks CertiFiber Pro Users Manual - Manual (Page 138)

Versiv Cabling Certification Product Family
Technical Reference Handbook
116
DIAGNOSTIC Tab
If the Autotest failed or had a marginal result, or if you selected
All Autotests for the HDTDR/HDTDX setting on the TEST SETUP
screen, the DIAGNOSTIC tab gives you access to the HDTDR and
HDTDX analyzer plots. The plots help you find the causes of NEXT
and return loss failures. See Chapter 3.
About dB Rules
For some test limits, the tester ignores the PASS/FAIL result from
some tests when a measurement is less than a specified value. For
example, the return loss measurement is not evaluated against
the limit at frequencies where insertion loss is less than 3 dB. This
is the 3 dB rule.
When a measurement is not evaluated against a limit, the tester
shows an for the result. On the plot for that measurement, the
limit line is black where the result is not evaluated against the
limit, as shown in Figure 60. When you upload the results to
LinkWare, N/A shows for the result.
For some ISO limits, if the result from the calculation of a limit
value is more than a specified value, then the limit is set to that
value. For example, for the ACR-F limit for the ISO Class E
A
test
limit, if the calculation of the limit value at a frequency gives a
result that is more than 65 dB, then the limit at that frequency is
65 dB.
The next sections summarize the dB rules. Tables 3, 4, 5, and 6
show the dB rules that apply to each test and the test limits that
use the rules. For more information, see the Knowledge Base on
the Fluke Networks website.