Traceability establishment in electrical calibration laboratory using reference digital multimeter
Marcelo Costa
Abstract:
This paper presents a strategy for traceability establishment in a electrical calibration laboratory using a precison 8 ½ digit digital multimeter as reference standard. The digital multimeter is calibrated by the National Metrology Laboratory or by an accredited laboratory, and some strategies to define the calibration plan considering the characteristics of the instrument, the scope of the calibration laboratory and the cost of the calibration are presented and discussed. The goal of the calibration plan is to allow the reference multimeter to be used in every measurement function and every range related to the calibration laboratory scope with guaranteed traceability and confidence, so correction factors for every point can be estimated from the calibration points presented in the calibration report. Finally, a calibration report data from a reference digital multimeter is analysed and processed in order to estimate calibration curves and some examples are presented and discussed.
