Problem with power supply with two floating outputs

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wossy

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Power Supply

Hello

I am developing a power supply with two floating outputs. Each output is opto isolated from a control board. The pcbs are in a metal case. My problem is that when I use a scope, connecting the ground lead causes a glitch on my ground causing the opto to switch. Any ideas how to stop this.

Thanks
 

Re: Power Supply

If you leave the two output "totally" floating you will always have this problem.
Try to connect a RC tank consisting of 4.7-10MΩ resistor and 4.7-10nF capacitor between grounds .. this should equalize potentials of circuits ..
After tests you can remove them and have the outputs floating again ..
 

Re: Power Supply

add a cap to decouple it
 

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