Ion detection system

An ion detection system comprising:

• one or more first devices configured to produce secondary electrons in response to incident ions;
• a first output device configured to output a first signal in response to secondary electrons produced by the one or more first devices;
• a second output device configured to output a second signal in response to secondary electrons produced by the one or more first devices;
• a first digitiser configured to digitise the first signal to produce a first digitised signal;
• a second digitiser configured to digitise the second signal to produce a second digitised signal;
• processing circuitry configured to determine first intensity and arrival time, mass or mass to charge ratio data from the first digitised signal;
• processing circuitry configured to determine second intensity and arrival time, mass or mass to charge ratio data from the second digitised signal;
• and
• processing circuitry configured to combine the first intensity and arrival time, mass or mass to charge ratio data and the second intensity and arrival time, mass or mass to charge ratio data to form a combined data set;
• wherein:
• the first digitiser is configured to digitise a first part of the first signal to produce the first digitised signal;
• the ion detection system further comprises a third digitiser configured to digitise a second part of the first signal to produce a third digitised signal;
• and
• the ion detection system is configured such that the first part of the first signal is multiplied, amplified or attenuated by a first gain prior to being digitised, and the second part of the first signal is multiplied, amplified or attenuated by a second different gain prior to being digitised.