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mackos

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Hi I have an old fluke 77 which works fine but recently on installing 12v 60w light transformers the 77 wasn't picking up the output voltage on AC or DC settings. I assumed wrongly that the transformers were faulty when I connected the lights they worked ok. I tried the 77 on some other types of similar transformers some it worked some it didn't. The ones it didn't pick up I tried my Fluke T120 which did register the voltage.Any ideas I am at a loss.Thanks Mack.
 
Yes all the ones I tested were the electronic type which was why I couldn't understand how the Fluke 77 only registered the output voltage on some of them yet my Fluke T120 got them all.Mack.
 
Were you reading the voltage with the electronic transformers loaded with their lamps, if not, it may well be the case that the high impedance of that particular meter was insufficient to minimally load the electronics into the switched on driving state and therefore the electronics believing there to be no load was turned off in the energy saving hibernation state.
 
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should have bought an AVO analogue meter.
 
Electronic transformers will not output any voltage until a suitable resistance is applied to them. Something around the 7.19ohms mark would be a suitable resistance or in other words a 20W lamp. Why would you be wanting to test the output voltage anyway? :confused:
 
some of these electronic transformers do output voltage without load & for fault finding sometimes it's quicker & easier to test the transformer as most of these seem to be less reliable than the bulbs,
 

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