By the way, very interesting forum! Keep on rocking guys!
I have a question for the experts here: I bought an LCR meter to measure the inductance of my pickups. I tried to plug a short patch cable to my guitars and measure the inductance that way, but soon I noticed how the pots influence the readings.
Now, also with resistance I get "false" readings, but I know how to "exclude" the pots and get the "real" value: yes, I use nominal values for the pots (not actual readings) but since the resistance of the pickup(s) in parallel with the pots is much smaller there's no much difference between a 220k load and a 270k load, so I can get pretty accurate readings without desoldering the pickups...
I was wondering if there's a similar method\formula to calculate the actual inductance, knowing the value of the pots...
Dodging the question - if you want to get accurate values of resistance for your pickups and pots, then we know how to do that. At full volume measure resistance, which due to the pots will be just under the pickup resistance, so add about 2% to allow. Now sweep the volume pot and take the max reading which will be at about 6 or 7 on a log pot. That figure is 1/4 of the sum of pot plus pickup (assuming no treble bleed circuit). That allows you to back-figure a very accurate pot value, then using that you can go back and correct that 2% allowance if you want to.
But....to do this to then get to the pickup inductance insitu is orders of magnitude more complex, due to the other components that are active, plus also, uncertainty about how a given meter on an inductance range will report on a load that is partly inductive and partly resistive. If we knew that then there'd be a chance using complex numbers for real and imaginary impedance to separate the values.
However Ive got an inductance range on my normal multimeter, it reads credible values for the inductance of in situ pickups, but accuracy is unknown.
Probably easier to do that unsoldering and then test. But you might in doing that, measure insitu and disconnected, and you might get a sense of how the parallel resistances affect inductance readings. Then you can use that to help interpret an approximate test on your other guitars.