Calibration

ANALYSIS OF VERIFICATION AND CALIBRATION METHODOLOGIES OF MEASURING INSTRUMENTS

The article focuses on the main problems of metrological confirmation of measuring instruments in accordance with international requirements and considers possible directions of their solution. One of the main tasks of metrology is assurance of the uniformity of measurements, that is, the state of measurements, in which their results are expressed in the legal units, and the characteristics of errors or uncertainty of measurements are known with a certain probability and do not exceed  the established limits.

DEVELOPMENT OF THE DOSIMETRIC STANDARDS BASE

The article deals with the development of the reference means of support and metrological insurance required for  metrological  verification  and  calibration  of  beta  and  gamma  radiation  dosimeters.  The  latter  are  extremely  necessary  for dosimetric measurements of radiation characteristics in the field of radiation safety, radiation diagnosis and therapy.

THE MODIFIED STRUCTURE OF THE TWO-LEVEL DIGITAL FREQUENCY SYNTHESIZER FOR DOSIMETRY

Digital  frequency  synthesizers  are  widely  used  in  various  fields  of  technology.  Their  main  advantages, compared  to  analog  devices,  are  the  accuracy  of  output  signal,  resistance  to  external  factors,  reliability  and  high  performance. Their structures include the digital storage device (accumulative adder) and a comparison scheme. Basing the latest the two-level digital frequency synthesizers are developed. They are the subset of digital frequency synthesizers, in which the output signals are two-levelled.

NEW APPROACH TO DETERMINING THE NEED OF MEASURING EQUIPMENT CALIBRATION

Ensuring the unity and metrological traceability of measurement results becomes the key component necessary to reach market confidence in the results of calibrations, tests or measurements. Important aspect of maintaining the ability of the laboratory to receive metrological traceability and reliable measurement results is to determine the maximum permissible period between two calibrations of the standards and measuring instruments that provides the acceptable accuracy of measurements during their operation.