If they are truly floating then keep the supply outputs that way.? Many power supplies have a binding post at earth e.g. attached to the chassis and supply ground so that the power outputs can have their -ve side referenced to it as needed.??
But be sure that your supplies are actually floating.? Are you sure the meter doesn't provide some reference to earth/ ground through it's? power supply?
Regards,
Dave
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On Fri, Jul 7, 2023 at 11:53 AM, Gerard wrote:
Hello,
Today I put the 3 integrated circuits.
The power supply? works fine and I can adjust the output? supply through the potentiometer.
I am limited to 25v max as my IC power supply design is limited to 25v. That should be enough for me and I don¡¯t take the risk of grilling them (Reminder no indication of the type of circuit, so I can¡¯t look at the datasheet)
Now I have a question for power ground and earth. (Recall there are 2 power supplies)
My enclosure is automatically connected to the ground via the mains supply cord. (Green/ yellow wire)
Now what is the rule for "-" power supplies.?
Must they be connected together and "floating" in relation to the earth or imperatively connected between them AND the earth of office. Is it a matter of safety and/ or avoiding loops??
Here, where it gets a little tricky, is that the display to visualize the amps must be on the loop of the "-" power supply. (See picture)
thank's for your return
cdt
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