I bought a Dr. Meter HY3005F-3 triple output power supply. The third output is labeled "5V, 3A". But I've measured it with a 10 ohm load and the voltage drops to 4.3V. With a 5 ohm load, it drops to 3.8V.
I wrote to the company and they said "please kindly be noted that the no-load voltage is 5V. If you want to get a stable 5V, please use other outputs."
I had expected that the output would provide 5V at a current draw of 3A, i.e. 15W. It sounds like they're saying I can get 5V or I can get 3A, but not both at once. Was my expectation wrong? Is that how power supply outputs are spec'ed?
- Bob