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AC Measurement Standard
5790B - Fluke Calibration (DH Instruments)
The 5790B is a multi-purpose ac measurement and transfer standard designed for the most demanding calibration applications. It combines the accuracy you 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).