Hi,
I am trying to restore a Fluke 87 III whose R21 has been eaten by corrosion (among other things).
I tried measuring the resistance from one end to the other of the trimmer, but corrosion seems to have eaten some of the carbon part too (i.e. not only its metal bits).
I've also looked at the only manual with schematics that I could find (i.e. that of the original 87 series) and R21 is listed as a .3W 100kOhm +/- 20% trimmer.
However, for series III, the trimmer is different even from a physical format perspective (i.e. lower profile, ceramic base), so I am not sure R21 in this version is supposed to have the same specs.
Is there someone that could confirm the specs for R21 on a Fluke 87 III for me, please?
For reference, it is the trimmer at the top of the picture below, right next to the yellow cable coming from the battery.
Thanks!