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05/08/2008 at 04:56PM PDT, ID: 23388071
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9.3

How to electrically characterize a multi-wire shielded cable

Asked by rwj04 in Math & Science, Miscellaneous Hardware

Tags: electrical, characterization, complex impedance, reactance, leakage, capacitive, inductive, coupling, yadda, yadda, yadda

BACKGROUND:   I'm having problems with some multi-wire shielded cable assemblies.  These are new batches from the manufacturer of a cable that has been used for years, and I haven't had this probelm before with previous shipments.

when installed as part of some test equipment, the cables are causing the test equipment to fail their initial calibration test with Impedance values that are just slightly out of range.  When I replace the cables back with "old" cables from the same manufacturer,  the test equipment passes just fine.

the cables are constructed correctly.  there are no deficiencies that are obvious.  the manufacturer has performed  several high-potential tests and the current leakage between conductors is within the spec we have called out.  

the end goal is that we are either going to have to change our test equipment calibration procedure, or change the specifications of the cables we get from the manufacturer.

QUESTION:

how do i go about characterizing the complex impedance of these cables?   i have access to a full function Hewlett Packard LCR meter.  I dont need a step-by-step hand holding, but I do need a good high level overview of what i need to do.

Im embarrassed to say, i probably studied this stuff in my EE classes, but damned if im not drawing a blank.   Bode plots were the bane of my sophomore year.

[+][-]05/08/08 08:40 PM, ID: 21530279

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About this solution

Zones: Math & Science, Miscellaneous Hardware
Tags: electrical, characterization, complex impedance, reactance, leakage, capacitive, inductive, coupling, yadda, yadda, yadda
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Solution Provided By: d-glitch
Participating Experts: 4
Solution Grade: A
 
 
[+][-]05/09/08 01:25 PM, ID: 21536183

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[+][-]05/12/08 01:10 PM, ID: 21550135

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[+][-]05/12/08 05:56 PM, ID: 21551561

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