Is my power supply safe or not?

[pinipon]

Hi guys,

I'm newbie in EEVblog forum. I would like to have your feedback about my "Chinese" power supply.
I bought this stuff 1 month ago and I decided to check some parameters/specs of the device:

Although the precision in DC is enough to me, on the adjustable output I can measure 80Vac rms between +/GND and same between -/GND. On the 5VDC fixed output I can measure 50Vac rms. Both 50Hz...

My question is: is that stuff safe or not?? or is an issue of the manufacturer... Do I have to claim to the store where I bought this stuff?

Please see the pictures at: https://www.dropbox.com/sh/ur99hk7cr8j6kds/AABXGCBb7qvm_AcoeBZFekFYa?dl=0

Thanks in advance for your help.

[T3sl4co1l]

That's normal.

What matters is, how much AC current?  It's dangerous if it's more than 5mA or so (under 1mA would be preferable).

Tim

[Simon]

put a 1K resistor in parallel with your meter and retry. I can get tens of volts off house walls if i use my meter with about 1Gohm input resistance

[TriodeTiger]

Either coupling from the transformer, or a cap across the transformer for RFI?, and probably very low current. I thought it in series halved the voltage however, but 80*2 seems like an odd voltage.

[amyk]

80*2 seems like an odd voltage.

Input impedance.

[pinipon]

I put 1k resistor between - and GND and take only 40mV rms, current below 0.05mA that's the minimum the meter can measure. Same between + and GND.

I do same tests with my home made power supply with initially I take 16Vac rms, but putting a load make the voltage drop to an insignificant value.

Thanks guys for your help.

Cheers,
Pinipon

[Simon]

if you just touch your meter probe you can pick up well more than 40mV from thin air