Quote ef37a:Quote umar78:
while a multimeter is a useful tool you can't always rely on it when testing for continuity on guitars. Guitar signals are usually less than a volt but the meter has 9V of power.
Not quite sure of the point you are trying to make there?
My Fluke puts out 112mV on resistance test and 3.6V on diode test. We are checking earth bonds on guitar screening not lightning bonding on Zeplins, a few tens of Ohms in the earth path will matter little.
And volts is,er, volts! Power is watts.
Fair comment Dave. I'm a guitar guy not an electronics one, which is why I look to yourself and Will for advice and info. And guilty as charged, sloppy terminology, consider my wrist slapped.
The point I was making? Many times I've had a guitar on the bench with a screening/grounding problem. Glaringly obvious when plugged in, but no obvious cause. All the right components, all correctly wired, checked and double checked, and the multimeter showing good continuity. I would patiently trace the wiring and draw it out as a schematic, then trace the connections with the meter. All with no joy. Then as a last resort I would desolder all the connections, remove the old solder with solder mop and solder sucker, clean the solder tags/pot bodies with a file/wet & dry to get back to good metal, and rewire with new hook-up wire. And problem solved. Identical wiring, same components, tests exactly the same with the meter, but problem gone.
And it was the same whether I used my old analogue meter, the shop's analogue meter, my digital meter or the shop's digital meter. However, all were/are budget meters not a decent tool like your Fluke.
So, while I may well be wrong in my reasoning about how it happens, I have regularly experienced guitar screening/grounding problems where the meter indicates continuity but is solved by reworking the connections. I'd love to understand exactly what is going on, maybe I should invest in a Fluke one day and see if it really is an issue with the budget meters hobbyists use or something else entirely.
When the going gets weird, the Weird turn Pro.