Implementación de un banco para calibración de cronómetros utilizando un oscilador de rubidio para el laboratorio de metrología de la Facultad de Mecánica

Abstract

The present research work, developed in the current document, had as its main objective the development of a calibration bench for time instruments, specifically chronometers based on a BELL EFRATON rubidium oscillator, donated by the Ecuadorian National Army Metrology Center, for the Faculty of Mechanics. The project was developed within three fields: statistical, electronic and metrological; In the electronic field, a circuit was analyzed and developed which consists of several stages, for the transformation of the frequency signals emitted by the oscillator to voltage signals for the supply of a LED in which the readings of time could be optimally observed; while the metrological field analyzed the signals emitted by the oscillator, no longer transformed to voltage values, but as time stamps that serve as a standard system for the calibration process; the statistical field analyzed these readings to determine errors and uncertainty in them. Once the standard system, errors and optimal operation of the circuit had been validated, the calibration of a CASIO brand chronometer was carried out with the taking of ten readings at different time intervals. The process was carried out under controlled physical conditions as mentioned in the ISO 17025 standard among others. The first showed an error of 0.33% and the last of 0.0139%, which were correspondingly the highest and lowest value, as well as the uncertainty; These readings are below the minimum error percentage of 5% to be rejected, so the calibration process was accepted and validated, later a calibration certificate with the author's own format was issued. During the process it is extremely important to control the propagation of errors, as well as a bad handling of the equipment, especially of the oscillator.