Improvement of filament-protection circuitry in a Finnigan model 251 mass spectrometer
Open-File Report
86-484
By: J. D. Wildman
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Abstract
As delivered from Finnigan MAT, the emission current of the Leybold-Heraeus model IM210 ionization vacuum gage on a model 251 isotope ratio mass spectrometer can turn on as soon as the ' PUMP ON ' switch is depressed, before a good vacuum in the mass spectrometer is attained. The filament in the source of the mass spectrometer may turn on at the same time, thereby shortening its life or burning it out if the vacuum is poor. This design flaw can be corrected by a simple modification of the electronic circuitry. (Author 's abstract)
Suggested Citation
Wildman, J.D., 1986, Improvement of filament-protection circuitry in a Finnigan model 251 mass spectrometer: U.S. Geological Survey Open-File Report 86-484, 4 leaves ;28 cm., https://doi.org/10.3133/ofr86484.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Improvement of filament-protection circuitry in a Finnigan model 251 mass spectrometer |
| Series title | Open-File Report |
| Series number | 86-484 |
| DOI | 10.3133/ofr86484 |
| Year Published | 1986 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | 4 leaves ;28 cm. |