I measure transmission loss by reading the display numbers when the marker is at the desired position.? If the line is open or shorted at the far end, the R reading in Ohms will indicate loss, as it would be infinite at zero loss.? A reading of 500 Ohms would indicate 10% loss I assume.
A lossless line shows as a trace at the outside edge of the Smith chart.
Bob
On Thursday, December 5, 2019, 02:56:59 AM PST, Oristo <ormpoa@...> wrote:
if I use CHO/CH1 to e.g. check a CMC and I select LOGMAG for CH1 is it then
true that LOGMAG will show transmission loss
If
* CMC means Common Mode Choke
* connections are e.g. Fig 3 (a) in
* CH1 was first calibrated without CMC
then that will yield transmission loss for common mode choke.
.. but if connected as Fig 2 (b) with CH1 as LISN, then measurement is
e.g. transmission loss for conventional coax that happens to have a CMC.
In theory, one could connect CH0 and CH1 centers to shield and center of one end of transmission line
and terminate the other end, as in Fig 2 (a).
With matched termination and without CMC,? CH1 would ideally show infinite loss,
so effectiveness of CMC is by lack of loss, so to speak.
