OWON ODP6033 - "Voltage Leak"

[dupreezarmand]

Good day,

I recently purchased an OWON ODP6033 Bench Power Supply and it is working well. I noticed the other day, while my power supply was still hooked up to my Electronic DC Load, 2.8mV to 4mV were present at the output of the power supply, with the channel output disabled.

If I short out the positive and negative on the power supply then the reading on the Electronic DC Load goes to zero as expected. When I remove the fault, the capacitor (I believe) is charging again and it reaches 15mV and then starts to taper down and eventually reach the 4mV mark.

I disconnected the DC Load from the power supply and measured the power supply output terminals directly, and it remains 2.8mV to 4mV.

When I enable/disable a channel on the Power Supply I don't hear a relay. I can see there is a bleeder resistor, because the voltage does drop rather quick, until about 15mv.

I am going to investigate this over the coming Weekend, but any ideas on what to look out for would be appreciated?

Thanks.

[sahko123]

it could be that the output is floating when the supply disables the output and causes the voltmeter to show a few millivolts