System and Method for Resistance Measurement

Inactive Publication Date: 2008-02-21
AVO MULTI AMP CORP MEGGER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present embodiment provides a network analysis device for improved measurement of resistance comprising an AC component to transmit and measure a signal for determining a resistance of a cable. The network analysis device further comprises a master unit comprising a master source impedance of transmitter to a receiving device resulting in a first master impedance, a plurality of diodes and a plurality of output capacitors resulting in a second master impedance, and a plurality of “shunt” diodes resulting in a third master impedance; and at least one coupling connector for connecting the network analysis device at the master unit to the cable. The network analysis device further comprises a remote unit comprising a remote source impedance transmit

Problems solved by technology

A number of different conditions may be the cause of cabling failing to pass the LAN certification tests.
The cable may be kinked somewhere along the cabling run, altering its electrical characteristics in such a manner as to degrade its frequency resp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

EXAMPLE 1

1000 Feet (0.1894 Mile) of Cat 3 Cable

[0073](rez2rezlengthxc)=(38.2483.10.1894595.8)

[0074]The uncorrected measurement is 44.86 Ω (83.1-38.24), the actual resistance is 54.8 Ω, and the corrected measurement is 55.1 Ω.

Example

EXAMPLE 2

1000 Feet of Cat 5e Cable

[0075](rez2rezlengthxc)=(38.2483.890.1894857.7)

[0076]The uncorrected measurement is 45.65 Ω, the actual resistance is 52.1 Ω, and the corrected measurement is 52.4 Ω.

Example

EXAMPLE 3

1000 Feet of Cat 5e Cable with 2.5 Ω Added to the Termination

[0077](rez2rezlengthxc)=(rez2n+2.586.60.1894857.7)

[0078]The uncorrected measurement is 44.2 Ω, the actual resistance is 52.1 Ω, and the corrected measurement is 52.3 Ω.

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PUM

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Abstract

A method for improved cable resistance measuring is provided comprising coupling a measurement test device comprising a master unit and a remote unit, via at least one connector, to at least one network cable and determining a terminating impedance using field calibration. The method additionally comprises transmitting an AC signal across the network cable for determining a resistance of the network cable, and measuring a length of the network cable. The method still further comprises measuring a capacitance of the network cable, and measuring an impedance of the network cable terminated by the measurement test device. The method additionally comprises extracting the resistance of the network cable from the impedance measurement, and correcting for error in at least one of capacitance, termination resistance, and nominal cable effects for a corrected resistance value.

Description

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Claims

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Application Information

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Owner AVO MULTI AMP CORP MEGGER
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