Mohr CT100B Series - Normal SMA Female Barrel Interconnect Measuring 52.1 Ohms

7. TDR Measurement Theory
Figure 7.4 and Figure 7.5 for SMA and BNC type connections. Connector damage and corrosion
can change the impedance profile of a connector over time, typically increasing the excess
impedance of the connector. Periodic surveillance with TDR can be used to confirm connector
performance.
Figure 7.4. Normal SMA female barrel interconnect measuring 52.1 ohms.
Figure 7.5. Comparison of typical SMA (red trace, bottom) and BNC (black trace, top)
coaxial cable interconnects.
Soft/partial faults can appear anywhere along the cable’s length.
Any fault has the potential to reduce the incident pulse strength for subsequent cable faults and
may change the apparent velocity of propagation. The accuracy of the Distance-to-Fault
measurement of a fault that appears beyond another fault is reduced.
98 CT100B TDR Cable Analyzers Operator’s Manual