Title: BfS-report-2019 (1).pdf
ment background of the calibration object (Co) is determined separately by purging with nitrogen gas.1529Seite 3PageDK150630100201911For each calibration period the difference between the calibration objects measurement value and instrument background (Cum - C,) is compared to the reference value Cref(see “Measurement results”). The calibration result is given as the ratio of the reference value to the difference of the calibration objects measurement value and instrument background km = Cres /(Cm-Co) (calibration factor). The following extended uncertainties (k=2) aregiven in the measurement results table: