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FAQ : Frequently asked questions. Problems: In General | Electron Microscope Mass Spectrometers In General: Q: My instrument will not pump, why? Q: The filament appears to be dead! Q: I have filament current but no beam. Electron Microscope: Q: Why do my filaments keep on blowing? Q: After changing the filament I cannot see a beam (light)? Q: I seem to have a straight edge across the beam path. Q: The beam profile is comet shaped. Mass Spectrometers: Q: Why do my filaments keep on blowing? Q: After changing the filament I have no peaks. Q: The sensitivity of the instrument has fallen off. Q: My peaks are very noisy.

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