an ion source configured to ionize a measurement sample,

a detector configured to generate an electrical signal in response to detecting ions from the measurement sample;

an analog calculation unit configured to calculate a first measured value based on an intensity and an area of a pulse in the electric signal generated by the detector;

a pulse counting unit configured to obtain a second measured value by counting a number of pulses of the electric signal generated by the detector; and

a processor that is communicatively coupled to the analog calculation unit and the pulse counting unit, wherein the processor is configured to:

receive the first measured value from the analog calculation unit,

receive the second measured value from the pulse counting unit,

calculate an A/P ratio indicating a ratio of the first measured value to the second measured value,

perform a comparison of the A/P ratio with a threshold,

determine that the detector has deteriorated and is no longer acceptable based on the comparison, and

determine that another component of the mass analysis system is contaminated by applying the A/P ratio to the first measured value to produce an adjusted value and comparing the adjusted value to the second measured value, wherein the another component is different from the detector.