I have a PSU that I would like to verify and see if it is outputting all of the correct voltages.
It's an old computer PSU from 1990 with a specific form factor that cannot be easily replaced with a new one.
The PSU will only switch on with a certain load attached to it. Usually it is sufficient to hook up a hard drive or an old floppy drive in order to get a computer PSU to start properly. Without load it will either not start, or try to switch on but make a clicking noise. Without load it is also not possible to measure any output voltages.
I am always a bit reluctant to hook up the actual intented load on to it (in this case a mainboard + hard drive + floppy drive), in fear of risking to damage the mainboard should there still be an issue with the PSU.
What is the best way to simulate such a load ? I was thinking about hooking up some resistors on certain power lines (The PSU also exposes -12V) but I am a bit unsure on how to calculate the resistor values (actual resistance but also wattage)
What would be a safe / meaningful way to simulate some load and make the PSU think it is hooked up to the mainboard, so I can verify that the voltages are OK before hooking up the PSU to the mainboard.