11-02-2014, 07:42 PM
If you are careful, you can disassemble the meter and clean between the magnet pole pieces and the movement coil. Typically there will be a particle in this area which causes the coil to rub at a certain point of deflection. Shine a strong light from the back of the movement and look between the poles for any foreign particles.
Another possible problem may be metal whiskers which will grow over time from the plating on the pole pieces. I have repaired this condition by carefully scraping the inside surface with a thin toothpick.
Would not recommend using any oil or lubricant as it would not help the condition you are describing. Check to see that there is not too much axial play in the movement pivot bearings, which would cause the coil to drag against the poles when the meter is horizontal.
Another possible problem may be metal whiskers which will grow over time from the plating on the pole pieces. I have repaired this condition by carefully scraping the inside surface with a thin toothpick.
Would not recommend using any oil or lubricant as it would not help the condition you are describing. Check to see that there is not too much axial play in the movement pivot bearings, which would cause the coil to drag against the poles when the meter is horizontal.
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