Full Description

The purpose of this procedure is to provide instructions for measuring cableimpedance. Two test methods are presented. The accuracy, ease of use, andrequired test equipment differ for each test method. The two methods are asfollows:

Variable bridge method: The return loss of a cable is measured, while varying theimpedance of a reflection bridge. The value of impedance, which gives theminimum reflection, is the average cable impedance. This method requiressimple, scalar (magnitude only) measurements. It is subject to errors from thecable connection and operator skill.

Fixed bridge method: The cable impedance as a function of frequency iscalculated from a vector (magnitude and phase) return loss. The average of thisimpedance across the desired frequency range is the cable impedance. This maybe automated, but requires a vector network analyzer, and may be subject to errorsdue to the cable connection.

Product Details

Published: 01/01/2003 ANSI: ANSI Approved Number of Pages: 13 File Size: 1 file , 45 KB