Title :
An assessment on the accuracy of time-domain reflectometry for measuring the characteristic impedance of transmission lines
Author_Institution :
Electron. & Electr. Eng. Lab., Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
fDate :
10/1/2001 12:00:00 AM
Abstract :
An assessment of time-domain reflectometry (TDR) for measuring the characteristic impedance ZTL of transmission lines is performed. The assessment includes the accuracy of measuring ZTL as a function of TDR electrical impedance Zo, the ability to measure impedance perturbations as a function Of ZTL and Zo, and the ability to differentiate between transmission lines of similar ZTL. The information presented will be especially useful for those using 50 Ω TDR systems to characterize transmission lines having characteristic impedances less than about 30 Ω
Keywords :
electric impedance measurement; measurement uncertainty; time-domain reflectometry; transmission lines; 50 ohm; accuracy assessment; accuracy limitations; amplitude discretization; characteristic impedance measurement; impedance discontinuity; impedance perturbations; paired conducting lines; sampling oscilloscope; time-domain reflectometry; transmission lines; Distributed parameter circuits; Electric variables measurement; Impedance measurement; Performance evaluation; Power transmission lines; Pulse measurements; Reflectometry; Time domain analysis; Transmission line measurements; Velocity measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
