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Gated RL testing
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on Feb 6, 2009
on Feb 6, 2009 by dgun
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I have been ask to do gated return loss test, normally I only do standard return loss test. I normally do s11 - single port cal & use a 8720 network analyzer. Where can i find a steup for the gated type RL test?
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Feb 6, 2009 3:53 PM
SCTE has documented tests for cable connectors using gating in the following documents;
IPS-TP-407 F Connector Return LossÂ–The purpose of this procedure is to provide instructions to
measure the return loss characteristics of a single type "F" connector-to-cable interface, at the
beginning of a cable, from 5 MHz to 1,000 MHz. This test method applies to SCTE specifications
IPS-SP-402, IPS-SP-403, and IPS-SP-404. This test method makes use of the time domain gating
feature of the network analyser to remove the far end connector effects from the near end connector
under test. ANSI/SCTE.
IPS-TP-408 F-Connector Return Loss In-line PairÂ–The purpose of this procedure is to provide
instructions to measure the return loss characteristics of a pair of type "F" connectors and the cable
interface, inserted in the middle of a cable, from 5 MHz to 1,000 MHz. This test method applies to
SCTE specifications IPS-SP-402, IPS-SP-403, and IPS-SP-404. This test method makes use of the
time domain gating feature of the network analyzer to remove the near end and far end test set
connector effects from type "F pair" in the middle of the cable, joined by a type F(f) - type F(f)
I couldn't find a free copy on the web, but you might if you look around a bit.
edit: I looked some more and found
http://www.scte.org/documents/pdf/ANSIS ... STP407.pdf
, and you can probably also look at
http://www.scte.org/documents/pdf/ANSIS ... STP408.pdf
which are copyrighted by the SCTE and maybe ANSI
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Feb 6, 2009 3:48 PM
(Assuming you aren't familiar with time domain)
You need to have the time domain option. It's been a long time since I used an 8720, so I don't know the exact steps, but here is a document that may help (chapter 6):
Agilent Time Domain Analysis Using a Network Analyzer
should describe how to setup the measurement (2-79 and 6-135).
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