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Hi all, possibly a stupid question, but input from professionals would be appreciated.

Im looking to buy my first voltage tester, (probably fluke) and have been looking at a few.

I understand there are ones with a self test function, or without then you buy a proving unit with it.

My thought is, can you rely on the self test function itself inside the unit, or are you better to go with a proving unit then you know for sure that you are testing it properly?

Any ideas?

Cheers,

Mike.
 
i wouldn't bother with a proving unit. test on the incomer which is still live after isolating.
 
True on domestic may be. But on industrial switch gear this may not be the case also accessing a live terminal just to prove your device would be frowned upon under a permit . We have a proving unit for such times but in the real world it hardly used by any of us. Mostly for witness testing and the nic man
 
how can you REally trust a proving unit...

possibly another MFT to test on the basis that 2 can't be duff!
 
2 units can be duff, unlikely but possible, proving unit might be incorrect aswell, but where do you stop. I trust proving my tester off the live side.
 
I see what you mean. I personally would have a proving unit too..couldn't you test a proving unit with a multimeter? or do they not work like that?
 
but then, is the multimeter OK?. how far do you go.
 
Using a proving unit is fail safe if done correctly. ie voltage tester should prove voltage everytime it is connected to proving unit. If it does not then either the proving unit or the voltage tester is at fault but regardless of which you would not continue.
 
Using a proving unit is fail safe if done correctly. ie voltage tester should prove voltage everytime it is connected to proving unit. If it does not then either the proving unit or the voltage tester is at fault but regardless of which you would not continue.

unless, of course, the neon screwdriver says it's OK. :joker:
 
Using a proving unit is fail safe if done correctly. ie voltage tester should prove voltage everytime it is connected to proving unit. If it does not then either the proving unit or the voltage tester is at fault but regardless of which you would not continue.

Thanks, thats true i suppose. Its either one of the other. Going to get a proving unit in that case. Thanks!
 
fluke T3. i've had mine for 10 years. no problems.
 
I use a combivolt 2, it has both lcd display and led display. Ive had it for around 3 years. Getting a bit tired now like...Ive never had a proven unit and the last time I used one was at college. I prove my VI's on a known supply and this has satisfied the Elecsa assessor in the past.
 
I use a T5-1000 at work, handy having voltage/current in one package. As for proving units, if you fail to get a reading/indication stop and investigate before carrying out any work.
 

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