Patent ID: 11972938
Assignee: THERMO FISHER SCIENTIFIC (BREMEN) GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A mass analyser comprising:
an ion source configured to output ions along an ion trajectory;
an ion detector configured to detect ions along the ion trajectory;
a first electrode arranged along the ion trajectory, the first electrode having a first mass shift per volt perturbation;
a second electrode arranged along the ion trajectory, the second electrode having a second mass shift per volt perturbation, wherein the second mass shift per volt perturbation opposes the first mass shift per volt perturbation; and
a voltage supply comprising:
a voltage source;
a first voltage output configured to provide a first voltage to the first electrode;
a second voltage output configured to provide a second voltage to the second electrode; and
a voltage divider network connected to the first voltage output, the second voltage output, and the voltage source, the voltage divider network comprising:
a first resistor configured to define the first voltage, the first resistor having a first ageing coefficient; and
a second resistor configured to define the second voltage, the second resistor having a second ageing coefficient, wherein the second ageing coefficient is selected based on the first and second mass shift per volt perturbations and the first ageing coefficient such that a first mass shift associated with the first electrode is compensated by a second mass shift associated with the second electrode.