Kalcifer
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Joined 10 months ago
Cake day: October 20th, 2023
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All of this user’s content is licensed under CC BY 4.0.
Measured voltage is completely dependent on what is used as a reference. If you were to measure the voltage of a power supply set to +30V with a voltmeter whose leads were backwards (ie positive on the voltmeter connected to negative on the power supply, and negative connected to positive), then you would measure -30V. All this is to say that if you connect your 30V supply “backwards”, you will have -30V. Now, there may be some circuitry in the power supply that only allows current in one direction, and it could be that it’s able to source a different amount of current than it’s able to sink, so be sure to check its manual.
I’d advise caution against arbitrary decisions with electronics — both for your own safety and the safety of the equipment.