That's what my comment would be. Don't demagnetize! Your meter needs it's magentas and won't work without them. Sometimes some liquid detergent (dish soap) on a soft cloth is good for diffusing static charge on the case. That or a drier sheet.
KB8BKU, Darryl in Dayton On Mar 13, 2011, at 4:51 PM, Ron wrote: > John, > Not sure that degaussing would be what you want. My guess is that the > north/south permanent magnet is on that disk. Then the coil causes a > magnetic field that moves the disc and the pointer with it. > > Every analog meter I know has a permanent magnet somewhere and a coil to > create a deflection relative to the permanent magnetic field. The Drake > meters are "backwards". Most meters have a moving coil and stationary > magnet. Drake has a moving magnet and stationary coil. > > I believe that is you degauss the disc, the meter will never work again. > Thought anyone else? > > 73, > Ron WD8SBB > > --- On Sun, 3/13/11, John Meyer <[email protected]> wrote: > > From: John Meyer <[email protected]> > Subject: RE: [Drakelist] T-4XB Meter > To: [email protected], [email protected] > Date: Sunday, March 13, 2011, 1:58 PM > > Ron, > > Thanks for your input. I'm a little afraid to try bending the needle. It's > going to take a steady hand. I wonder if the problem develops because of some > residual or stray magnetism. If that were the case possibly a degaussing > device like used to demagnetize tape heads would resolve the problem. I > believe I have one of those devices around here some place left over from my > days of servicing tape decks. > If I can dig it up it may be worth a try. > Date: Sun, 13 Mar 2011 06:24:15 -0700 > From: [email protected] > Subject: Re: [Drakelist] T-4XB Meter > To: [email protected]; [email protected] > > John, > I have a meter here too that is the same way. It appears that the meter > movement is made of a disc of magnetized? material inside of a coil. I was > going to carefully bend the needle, but I happened upon "new" one. It's been > some time, but I was going to approach as follows. Put a close fitting brass > tube from the model airplane shop over most of the needle. With a very fine > pointed pliers hold the base of the needle (above the movement bearing area). > Now very slowly bend the needle in the direction needed. > > BTW this was the meter that left me with a small piece of plastic in my > cornea. Just had my eyes exam this week, and doc tells me I am a very lucky. > > > 73, > Ron WD8SBB > > --- On Sat, 3/12/11, John Meyer <[email protected]> wrote: > > From: John Meyer <[email protected]> > Subject: [Drakelist] T-4XB Meter > To: [email protected] > Date: Saturday, March 12, 2011, 1:37 PM > > My T-4XB meter movement is off scale to the left of the zero mark. I have > removed the meter and to my surprise there doesn't appear to be anyway to > zero the needle. Any suggestion to get the needle to rest at zero would be > appreciated. > > Thanks, > > John Meyer K8IHY > > -----Inline Attachment Follows----- > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist
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