Discuss Kewtech Lightmates - nulling required? in the Electrical Forum area at ElectriciansForums.net

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Given they plug in, I would null the leads as all it takes is a little bit of grime on a contact and you could skew the results a little.
 
I'm not so much thinking the units themselves, but the leads and the contacts where you connect to them. I've yet to use mine for dead testing but based on the variance I can get on my normal leads... anything higher than 0.11ohms and I know I've got potentially got dirty contacts.
 
have never bothered nulling mine, If anything I find that the light mates will likely give a better reading than if nulling leads and probes/clips as it is all to easy to have them not touching just right when nulling and skewing your readings that way. I did see some cheap versions of the kewtech light adaptors on ebay recently and did wonder how good they would be in comparison?
 
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a very useful bit of kit. Great for doing a quick Zs between a dangly and a screw of a switch.
I haven't nulled them for any dead testing, the resistance is negligable, remember we're looking for results within a range to meet certain standards for circuit disconnection times and volt drop. if you're looking to negate such tiny resistances to get the circuit to comply then there's probably cause for concern anyway.
 
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