A Basic test using a recently acquired feed-thru terminator on my scope. This illustrates the usefulness of this 50 ohm test method at RF and as per EMRFD and also gave me some idea of the actual output impedance of my Function Generator which appears to be a little high on all readings. The analysis of course assumes that the terminator is exactly 50ohms (and that the comparative scope reading is linear). This is reasonable since I purchased the terminator from a reputable company working in this space ref picotech.com
It will be instructive to conduct the same tests once I have built a planned Return Loss Bridge. This should yield a more accurate result.