Time-of-flight mass spectrometer and tuning method for the same

A method for tuning a plurality of time-of-flight mass spectrometers each of which has a measurement unit which includes a flight-field creation section configured to create, within a flight space, an electric field for causing ions to fly, and an ion acceleration section configured to accelerate ions which are a measurement target and to send the ions into the flight space, the tuning method comprising:

• a target setting step for setting a target value of the mass-resolving power common to the plurality of time-of-flight mass spectrometers;
• and
• a measurement step and a voltage determination step which are performed in each of the plurality of time-of-flight mass spectrometers, wherein:
• the measurement step includes repeatedly performing a measurement for a predetermined sample while varying a voltage applied to an electrode included in the measurement unit, and calculating the mass-resolving power based on a measurement result in each measurement;
• and
• the voltage determination step includes determining a voltage value corresponding to the target value based on data of a plurality of combinations of the voltage applied to the electrode and the mass-resolving power corresponding to the voltage, obtained in the measurement step, and determining the voltage value as the voltage to be applied to the electrode in the time-of-flight mass spectrometer concerned.