The solderability tester is an instrument which is used to test the solderability of the electronic components during the producing process, screening retests and before loading the system. Time parameter is an important index for solderability tester. Mainly on the specimen dipping duration time for research is discussed. After analysis the traditional counting method, we put the time interval measurement into the calibration for component solderability tester, and assess the measurement uncertainty of specimen dipping duration time. In this paper, the results show that compared to the traditional method, time interval measurement is simpler and more obvious. The problem of calibration for solderability tester is solved.