I was repairing a SMPS. A 33uF400V capacitor leaked its liquid all over the supply and made the fuse burn. There was no newer one. I scrapped/borrowed few such capacitors. Some two of them shows nothing in my DMM's capacitance meter. One 33uF used to show just 8.5uF in the DMM however I used that in the SMPS and got BOOM within a minute!!!
Another one with 33uF was showing 13uF in the DMM and I used that one. It's working from an hour with 800mA (around 1A) load and getting little hot. Not more. I also had measures some high voltage used caps and they were showing very low capacitance in the DMM. Other low voltage (eg, 10uF 16V) shows pretty nice and close to its rating.
Question is: is it normal to get very low capacitance with high voltage electrolytic capacitors or they seems partially damaging capacitors?
Another one with 33uF was showing 13uF in the DMM and I used that one. It's working from an hour with 800mA (around 1A) load and getting little hot. Not more. I also had measures some high voltage used caps and they were showing very low capacitance in the DMM. Other low voltage (eg, 10uF 16V) shows pretty nice and close to its rating.
Question is: is it normal to get very low capacitance with high voltage electrolytic capacitors or they seems partially damaging capacitors?