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The 5790A is a complete automated ac measurement standard designed for the most demanding calibration applications. It combines the accuracy you would expect from a thermal transfer standard with the ease of use of a digital multimeter. Absolute ac voltage measurement uncertainties are as low as ±24 ppm (one year, 23°C ±5°C). The 5790A is designed to meet the complete ac voltage and wideband verification requirements of the Fluke Calibration 5700A, 5500A, and 5100 Series and other calibrators, amplifiers like the 5725A and 5205A, and transfer standards and ac voltmeters.