Probably a silly query but is there a way of determining a capacitors voltage rating? I have a bag of Philips caps which have lost all their markings. Using my LCR meter I can determine the capacitance but I've no idea on the voltage rating. I suspect most are between 6.3V - 25V, other than a rough guess on the package size which is a wet finger in the air, I was wondering if any of the workshop guru's have a method.
I thought about putting them on my HUNTS bridge and monitoring leakage starting at the lowest rated and working my way up. Trouble with this method is I don't know enough about the characteristics of a capacitor and how it should behave, will it start to leak when over voltage or will it just go bang.
With that thought in my mind I did a test on a known cap, a 1000uF 75V cap feeding it via the 10V - 100V range. The leakage light struck whilst it charged and the voltage steadily increased. The leakage light went out and the voltage stabilised at around 80V, it remained so for the duration of the test, this indicated a good working cap. I then upped the voltage to the 100V - 200V range, the leakage light struck once again as the voltage increased to over 125V+. Now I'm not sure if this is a good indicator or a stressful or destructive test or indeed if its pure rubbish.
Any advice? If there's nothing that can be done then I will just bin them.