Case Study on Electrical Calibrator Instrumentation

This document is a case study that examines methods for characterizing and disciplining electrical calibrator instrumentation to enhance test accuracies and measurement uncertainties. The paper addresses the issue of insufficient accuracy in commonly used electrical calibrators when testing high-performance instruments, such as 6½ digital multimeters. It outlines the proposed solution of utilizing high-precision 8½ digit multimeters to characterize lower accuracy calibrators, thereby improving the measurement uncertainties in calibration tests. The study presents various techniques for characterizing calibrators, including real-time characterization and long-term drift characterization, which help establish a more accurate working specification for calibration instruments. The document emphasizes the benefits of improving existing calibration capabilities without the need for costly equipment upgrades, thereby maximizing the performance of current instrumentation. The analysis includes specific examples and comparisons of calibration specifications, illustrating the effectiveness of the proposed methods in achieving better test accuracies.