| Products > Test Equipment |
| Range selector of Metrahit multimeter sticks. WHY? |
| (1/3) > >> |
| Finderbinder:
It is very hard to turn range selector, but if you have already turn it, it becomes almost normal... until you leave it untouched for some time, then again it is very hard to turn it. Does anyone know the reason? |
| Fungus:
You didn't take it apart to look? :-// This is EEVBLOG... (maybe some old internal grease) |
| Finderbinder:
I had took it apart, there weren't any grease (although clean and no signs of wear... at least I didn't notice any). I thought that was the reason so I greased it. It was ok for that day but next day I noticed sticking got back :palm: I thought it would be a systematic problem with these range selectors, but google finds 0 problems like this :scared: |
| robert.rozee:
it could be that the range selector is intended to operate dry. try disassembling again and clean out every trace of grease or other contaminant, then reassemble and test again over a couple of days. this used to be a problem with garage door openers - customers would grease the pole that the shuttle ran along and then complain that it kept sticking. we would send someone out (this was 20+ years ago) to clean all the grease off and the problem would go away. the shuttle was made out of a plastic that was designed to shed a fine dust that acted as the lubricant. cheers, rob :-) |
| Fungus:
Is the selector part of the PCB OK? Any burn marks? Clean the PCB with Isopropyl Alcohol. Leave the range selector separated from the PCB for a day. Is it the selector that sticks or the PCB contacts? |
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