The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 1985
Filed:
Sep. 25, 1982
Finnigan Mat GmbH, , DE;
Abstract
For calibrating mass spectrometers with a plurality of ion targets (1), especially Faraday targets, to which a separate measuring channel is assigned in each case, an electric current from a highly stable electrical voltage-source (6) is supplied, as a measurement reference-value, to the individual measuring channels, in chronological succession, via a resistor (R.sub.2) having a high degree of constancy. For this purpose, a control device (7) is provided, which actuates switching devices (K.sub.1 -K.sub.n) in such a manner that the correct chronological sequence is maintained. The calibrating measurement-values, obtained with the aid of this highly stable current, are intercorrelated in order to form a correction-value, this correlating operation being performed in a calibrating-correction unit (5). Several calibrating measurements, with different currents, can be carried out for each measuring channel (V.sub.1 -V.sub.m), and these measurements can also be carried out with the aid of an external, linearly controllable voltage-source, which produces these currents via the resistor (R.sub.2) having a high degree of constancy.