Analyzer and warm-up determination method

A method of determining a warming-up of an analytical instrumentation that comprises a sample chamber that loads a sample, a light source that radiates a light to a position of said sample in said sample chamber, and a light detector that detects said light from said sample chamber;

• comprising:
• a step of determining a completion of said warming-up based upon a variation amount of a detection signal in a predetermined duration when said light detector detects said light from said sample chamber without loading said sample in said sample chamber;
• and
• wherein said step of determining additionally determines that a difference between a detection signal at a time when said predetermined duration passes and a detection signal at a previous time, when said predetermined duration has passed, is less than a threshold value every time when said predetermined duration passes, and that said warming-up is complete when said difference less than said threshold value takes place multiple continuous times.