earckens
Active Member
I have a PSU with isolated outputs. When I connect my scope ground to the PSU negative sometimes (more often than not) the overcurrent sense kicks in and draws the positive to 0V (although no overcurrent or short circuit is present, it is just the overcurrent circuit that is very sensitive).
When I connect a 10R 50W resistor between earth and the PSU negative I measure 0,000Vdc and 0.00175Vac (or less) over this resistor. When I measure between earth and PSU negative there is 0Vdc and about 46Vac, fluctuating.
It is very annoying when doing measurements with my scope on sensitive electronics circuits that my PSU kicks out or generates oscillations on its output.
Should/may I either place a large ceramic or metalfilm capacitor between earth and the PSU negative? Or provide a removable link between both?
Edit: when I remove this resistor, the PSU keeps working. When I connect this resistor while the PSU is on, more often than not (again) does the PSU kick out. When I switch it off and then back on again with the resistor connected, all is well.
When I connect a 10R 50W resistor between earth and the PSU negative I measure 0,000Vdc and 0.00175Vac (or less) over this resistor. When I measure between earth and PSU negative there is 0Vdc and about 46Vac, fluctuating.
It is very annoying when doing measurements with my scope on sensitive electronics circuits that my PSU kicks out or generates oscillations on its output.
Should/may I either place a large ceramic or metalfilm capacitor between earth and the PSU negative? Or provide a removable link between both?
Edit: when I remove this resistor, the PSU keeps working. When I connect this resistor while the PSU is on, more often than not (again) does the PSU kick out. When I switch it off and then back on again with the resistor connected, all is well.