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Old 30th December 2012, 08:50 PM   #1
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Default Grounding of a custom power supply

I am experiencing with power supplies and I am wondering how does one wire the supply for grounding. As I would like to see what is happening with an oscilloscope and there is always a voltage present between the probe ground and any terminal of the transformer, the fuse blows up.

Would someone be kind enough to point me to information answering the following questions:

- Do I connect the sector ground to the chassis?
- Do I connect the center tap of the secondary (for dual voltage power supply, for op amp polarization) to the chassis too?

Thank you,
Michel
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Old 30th December 2012, 09:51 PM   #2
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Join Date: Feb 2012
Xfmr sec neutral/center tap should go to the chassis ground/mains earth/safety earth what ever you want to call it.

See here for how to ground...understanding star grounding

And here...Transformer grounding questions

The scope probe should be on the hot, the probe ground the earth always. Never use the probe ground to measure floating / energized circuits. You can use the ground for measuring if using a differential probe or a battery operated scope. I doubt you have either. The fuse is blowing due to you shorting through the probe ground clip. It is connected to earth on the scope it self. The ground pin on the mains plug.

Last edited by NissanSR20Man; 30th December 2012 at 10:04 PM.
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Old 31st December 2012, 03:31 PM   #3
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Join Date: Jul 2012
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Thanks for the info and the links. This helps
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