Multi-fixed-point cells and temperature calibration system using it

A thermometer calibration apparatus using a multi fixed-point cell for calibrating a thermometer, comprising:

• an external tub provided with a lid;
• a multi fixed-point cell for calibrating a thermometer enclosedly inserted into the external tub and having a thermometer inserting hole at one side and in which an internal tub is contactably inserted, the multi fixed-point cell having a thermal relationship with respect to the internal tub, and at least two reference material holes, in which reference materials having different phase transition temperatures are sealingly enclosed, formed on a same plane as that of the thermometer inserting hole so as to be spaced apart from each other;
• the thermometer enclosedly inserted into the internal tub;
• a temperature control means for heating or cooling the external tub which is introduced therein so as to derive the phase transition;
• a temperature display part connected to the thermometer, for displaying a temperature measured by the thermometer;
• and
• a computer connected to the thermometer, for comparing and storing a difference between a reference temperature of each reference material and a temperature measured by the thermometer in a constant temperature section according to the phase transition of the reference material, and deciding error of the thermometer according to the difference between the two.