Abstract: In order to meet the requirements of temporary measurement guarantee of high aging tasks,based on the comparative measurement method,the existing measuring equipment of the target range such as time development and control terminal and high-speed video equipment is used to form a measurement calibration device to realize the simultaneous calibration of the timing error of multiple electronic stopwatches,and to calibrate the error of any timing length of the electronic stopwatch.Then,taking the calibration results of the daily difference index of the electronic stopwatch as an example,the measurement uncertainty is assessed and the calibration results given by the superior measurement technical organization are verified.The results show that the above method is more convenient,fast and easy to operate,and the calibration results are scientifically and credible.In the case of meeting the test uncertainty ratio,the emergency measurement guarantee method of using the existing test and measurement equipment resources to solve the temporary calibration problem is feasible and worth popularizing.

Key words: Measurement guarantee, Test uncertainty ratio, Daily difference, Measurement uncertainty