High accuracy AC current sources calibration by single junction thermal converters at INM

The National Metrology Institute of Colombia (INM) uses high accuracy calibrators (such as Fluke 5720A/5730A) AC current reference standards. We describe the implementation at INM AC-DC transfer standards by single junction thermal converters (SJTC) to improve measurements and give traceability International System Units (SI) within country. measurement model, present uncertainty budget estimation accordingly Guide Expression Uncertainty in Measurement (GUM) analyze effect temperature electrostatic on measurements. Expanded uncertainties between 68 μA/A 2.6 mA/A were obtained for calibration transconductance amplifiers currents from 5 mA 20 A (40 Hz kHz). results are compatible with Institutes like Centro Nacional de Metrología Mexico (CENAM) Accredited Laboratories Fluke.