Understanding VNAs - Cable Impedance Measurements
This video explains how to measure the characteristic impedance of a coaxial cable using a vector network analyzer and the Smith Chart.
Understanding the Smith Chart: • Understanding the Smith Chart
Learn more about R&S Network Analyzers: http://rsna.us/6059gc5Ol
Timeline:
00:00 Introduction
00:15 Suggested viewing
00:30 About coaxial cables
01:29 About the quarter wave impedance transformer
02:17 Measurement methodology
03:02 Cable and load are both 50 ohms
03:21 Cable and load are not both 50 ohms
04:01 Choosing start and stop frequencies
05:07 Calculating Z0 from Smith Chart
05:48 Summary