Verifying the Wideband Input of an AC Measurement Standard

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Verifying the Wideband Input of an AC Measurement Standard (2.18 MB(兆))

This application note describes the test method used by a calibration laboratory to verify the flatness and gain error of the wideband input of an ac measurement standard such as the Fluke 5790A and 5790B. All information applies to both 5790A and 5790B unless otherwise specified. The 5790 wideband input has a 50 Ω input impedance and measures voltage from 700 μV to 7 V, 10 Hz to 50 MHz on eight voltage ranges. Discussed first are some issues associated with verifying an instrument with a 50 Ω input impedance followed by a description of the method used to verify the ac measurement standard. Last is a description of the methods used to calibrate the standards used.