How to check UV light working?

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Before re-installing my UV filter this year (for Savio skimmer), I decided to check that it was working OK. After putting on UV protective glasses, I plugged the unit in and looked at the bulb, and saw nothing. After disconnecting the bulb, I tried to check that power was reaching it, using a multimeter. There are 4 terminals that connect the bulb to power supply (Emperor, see pic), but I could only check 2 at a time - so probably not reliable (0.2 V AC only). I thought that the transformer would be a reliable part of the setup. Anyone have any experience with what it likely to fail with this system?
Thanks.
 

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Did you use a new light bulb?
 
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Did you use a new light bulb?
Thanks Gemma. The bulb is part of the dilemma, it was new last year, although I admit I did not check it before using. Getting a new bulb might be the reasonable decision, as I will need one at some time anyway, and if the new bulb doesn't work then it must be the power supply. Actually found out that the power supply is a ballast, not a transformer as I had thought.
 
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I have a Savio UV too, that slides into the skimmer. I find I get two seasons from the bulb, before it becomes ineffective. I'd try a new bulb :)
 

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