Ground Resistance

27 08 2011

All photos.

Now that I have a milliohm meter, I want to measure the resistance of everything.

Ground quality is important for safety and signal quality.  So I measured the resistance of my grounding network. I made two 5 meter long Kelvin probes to do so:

I have two main ground connections. One is the ground pin on a standard wall outlet. The second is a braided wire to a water pipe:

Normally these ground exits are star connected. As a test I disconnected them from one another and measured the resistance between them: 700mΩ.

For various test points on the machine and rack we see from 10 to 100mΩ

I realized that this potentiometer is not grounded at all!

I will ground this forthwith!

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