A published equipment manual shows a schematic of a coaxial cable carrying a digital…
PHYSICS · Subjective · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electronics, Instrumentation & Communication · Sensors, detectors and experimental instrumentation
Inside the Instrument, Ch Transmission lines, grounding and the bench
Problem
A published equipment manual shows a schematic of a coaxial cable carrying a 30MHz digital clock between two chassis, with the shield as the clock's signal return. The shield is drawn bonded to chassis only at the source end, with the caption: "the shield is grounded at exactly one end, as always, to avoid a ground loop." A footnote states that this cable's shield cutoff frequency, from its Rs and Ls, is 2kHz. Find the error in the manual's grounding choice and state what should be done instead.