CALIBRATION OF EXTREMELY SENSITIVE RANGES OF DC PICOAMMETERS WITH ANALOG ACTIVE I/U CONVERSION
Journal Title: Metrology and Measurement Systems - Year 2005, Vol 12, Issue 1
Abstract
The paper deals with the problem of calibration of extremely sensitive picoammeters with measuring ranges close to limits of the measuring possibilities. The presented method of calibration bases on a resistive source of very low DC standard current, namely a current calibrator. Procedure for the design of a proper calibrator, criteria of optimal selection of high value resistance standards and a detailed analysis of the accuracy of obtained calibrating current have been described. The principle of evaluation of measurement uncertainty and method of assessment of combined uncertainty for calibrated picoammeters with analog and digital display have been introduced. It has been shown that in an averagely equipped measuring and research laboratory and using relatively simply accessible resistance standards with values of 1010 - 1011 Ω, it is possible to calibrate the most sensitive ranges of picoammeters with active i/u conversion.
Authors and Affiliations
ZBIGNIEW KŁOS
Keywords
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