Was doing a job today in a small bungalow and using customer supplied switches (MARBRO) :yellow card
Testing My R1+R2 at a fititng and it was reading something like 1.42ohms.. now I know that it's well within limits for a B6 circuit, but I thought I'd investigate so I took did the same test at the switch on both the supply side and the load side (different!), so I took the switch off and measured the contact resistance.......
It varied between 0.6ohms and 1ohms on the same switch:red card:red card:red card
so I replaced them with Crabtree (0.00ohms contact resistance)
and YES my meter leads were zeroed and I'd also only just put in new batteries...
Testing My R1+R2 at a fititng and it was reading something like 1.42ohms.. now I know that it's well within limits for a B6 circuit, but I thought I'd investigate so I took did the same test at the switch on both the supply side and the load side (different!), so I took the switch off and measured the contact resistance.......
It varied between 0.6ohms and 1ohms on the same switch:red card:red card:red card
so I replaced them with Crabtree (0.00ohms contact resistance)
and YES my meter leads were zeroed and I'd also only just put in new batteries...