A method of mass spectrometry comprising: passing a test signal through a first signal path of a dual gain ADC detector system to produce a first signal and to determine a first time T1 for said first signal path; passing a test signal through a second signal path of said dual gain ADC detector system to produce a second signal and to determine a second time T2 for said second signal path; determining an intensity difference or ratio between the first signal and the second signal; determining a time difference ΔT between said first time T1 and said second time T2, wherein said time difference ΔT is selected from the group consisting of: (i) 10-20 ns; (ii) 20-30 ns; (iii) 30-40 ns; (iv) 40-50 ns; (v) 50-60 ns; (vi) 60-70 ns; (vii) 70-80 ns; (viii) 80-90 ns; (ix) 90-100 ns; (x) 100-200 ns; (xi) 200-300 ns; (xii) 300-400 ns; and (xiii) 400-500 ns; detecting analyte ions using an ion detector and outputting a first signal and a second signal from said ion detector; digitising said first signal using a first Analogue to Digital Converter to produce a first digitised signal and digitising said second signal using a second different Analogue to Digital Converter to produce a second digitised signal, wherein said first Analogue to Digital Converter and said second Analogue to Digital Converter operate at a digitisation rate selected from the group consisting of: (i) 1-2 GHz; (ii) 2-3 GHz; (iii) 3-4 GHz; (iv) 4-5 GHz; (v) 5-6 GHz; (vi) 6-7 GHz; (vii) 7-8 GHz; (viii) 8-9 GHz; and (ix) 9-10 GHz; detecting one or more peaks in the digitised signal data produced by the dual gain ADC detector system for the detected analyte ions; determining an intensity value and an arrival time, mass, or mass to charge ratio value for said one or more peaks; correcting the intensity value of said one or more peaks using the determined intensity difference or ratio; and correcting the arrival time, mass, or mass to charge ratio value of said one or more peaks using the determined time difference ΔT . passing a test signal through a first signal path of a dual gain ADC detector system to produce a first signal and to determine a first time T1 for said first signal path; passing a test signal through a second signal path of said dual gain ADC detector system to produce a second signal and to determine a second time T2 for said second signal path; determining an intensity difference or ratio between the first signal and the second signal; determining a time difference ΔT between said first time T1 and said second time T2, wherein said time difference ΔT is selected from the group consisting of: (i) 10-20 ns; (ii) 20-30 ns; (iii) 30-40 ns; (iv) 40-50 ns; (v) 50-60 ns; (vi) 60-70 ns; (vii) 70-80 ns; (viii) 80-90 ns; (ix) 90-100 ns; (x) 100-200 ns; (xi) 200-300 ns; (xii) 300-400 ns; and (xiii) 400-500 ns; detecting analyte ions using an ion detector and outputting a first signal and a second signal from said ion detector; digitising said first signal using a first Analogue to Digital Converter to produce a first digitised signal and digitising said second signal using a second different Analogue to Digital Converter to produce a second digitised signal, wherein said first Analogue to Digital Converter and said second Analogue to Digital Converter operate at a digitisation rate selected from the group consisting of: (i) 1-2 GHz; (ii) 2-3 GHz; (iii) 3-4 GHz; (iv) 4-5 GHz; (v) 5-6 GHz; (vi) 6-7 GHz; (vii) 7-8 GHz; (viii) 8-9 GHz; and (ix) 9-10 GHz; detecting one or more peaks in the digitised signal data produced by the dual gain ADC detector system for the detected analyte ions; determining an intensity value and an arrival time, mass, or mass to charge ratio value for said one or more peaks; correcting the intensity value of said one or more peaks using the determined intensity difference or ratio; and correcting the arrival time, mass, or mass to charge ratio value of said one or more peaks using the determined time difference ΔT . <EOS>