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Bogus power supply specs?

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rea5245:
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

brabus:
The unit is faulty. The third output must provide 5V at 3A.

Shock:
If that was the case it would be an unregulated channel on the power supply. Normally the 3rd channel will be either fixed or variable but regulated. If it says 5V 3A you expect 3A running at 5V. It will say in the manual anyway.

Did you write to the manufacturer or distributor or just the seller. The seller probably has no idea.

Zorc:
I agree with brabus.

Did you contact techsupport at support@drmeter.com ?

By the way, from the manual @ drmeter.com

1.3Fixedoutput
1.3.1Outputvoltage:5V±2.5%
1.3.2Outputcurrent:3A
1.3.3Lineregulation:CV≤0.01%+1mv
1.3.4Loadregulation:≤0.1%
1.3.5Rippleandnoise:≤0.5mVr.m.s
1.3.6Protection:currentrestrictedandshort-circuitprotection

rea5245:

--- Quote from: Zorc on October 24, 2019, 03:20:05 pm ---Did you contact techsupport at support@drmeter.com ?

--- End quote ---

Yes. They're the ones who responded "please kindly be noted that the no-load voltage is 5V. If you want to get a stable 5V, please use other outputs."

- Bob

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