| Electronics > Projects, Designs, and Technical Stuff |
| Wish to scope the secondary diode voltage on our offline Flyback SMPS |
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| David Hess:
--- Quote from: treez on October 21, 2018, 11:09:35 am ---Thanks, we’re actually thinking of using a piece of coax, and putting a 9 Meg resistor at the end of it, in order to make a high bandwidth scope probe. Has anybody tried this? We could add a 15pF cap in parallel to the 9Meg resistor too. We wish to do this because we wish to have something thats solderable to the test point. The "spring barrels" we find, are too fiddley and dont always give a good connection to the ground barrel.....(maybe its just us but thats how we are finding it) --- End quote --- What you are suggesting is very difficult to do properly. Much better is to use a BNC to probe tip adapter on the oscilloscope probe to connect to short length of thin cable like RG-174 or RG-178 which is then soldered to the test point. That is how I generated the results shown above. |
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