UNH-IOL Electrical Characteristics Measurement ToolOverviewThe DSL Consortium developed the Electrical Characteristics Measurement Tool as a general-purpose test tool to measure several electrical properties of DSL equipment. It allows the measurement of complex input impedance, longitudinal balance, return loss, attenuation, phase response, and group delay. It combines an easy-to-use graphical interface to a network analyzer with useful features to expedite and clarify data analysis.Network Analyzer InterfaceThe network analyzer interface gives the user total control of the measurement, allowing the following sweep parameters to be set:
Data DisplayEach type of measurement has its own tab with network analyzer controls and display features. Each type of measurement offers various display formats, and measurements can be displayed on a logarithmic or linear frequency axis. The measured data can also be evaluated at a specific frequency value specified by the user.
Input Impedance MeasurementsThis tab is used to measure the complex input impedance of one-port devices. Input impedance measurements allow the following display formats:
Longitudinal Balance MeasurementsThis tab is used to measure the longitudinal balance of one-port devices. With a well-balanced balun and a longitudinal bridge, a common mode voltage is applied to the DUT and the resulting differential voltage is measured. The ratio of these two voltages is called longitudinal balance and is a measure of how well the DUT rejects common mode noise.
Reflection MeasurementsThis tab is used to measure the reflection coefficient of devices using a one-port technique. The reflection coefficient can be evaluated with respect to an arbitrary load impedance. Reflection measurements allow the following display formats:
Frequency Response MeasurementsThis tab is used to measure the frequency response of two-port devices. Frequency response measurements allow the following display formats:
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