Author Topic: BNC 50ohm Feed Thru  (Read 8689 times)

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Offline G0HZU

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Re: BNC 50ohm Feed Thru
« Reply #50 on: December 19, 2023, 09:14:35 pm »
Here's what happens if I put the Zo probe on channel 3 set to 1Meg input and I fit a commercial 50R BNC through termination at the input of channel 3. You can see lots of artefacts appear now and these are caused by (re)reflections in the cable of the Zo probe. It's possible to estimate the cable length by looking at the delay time of the artefacts as they appear on the waveform.
Now put a ~3db 50ohm attenuator on front side of feed thru. Does the trace look better?

See below

 


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