In this video Shahriar upgrades an Agilent 3400B RMS meter to add an LCDbased GUI interface and USB digitization capabilities. This excellent instruments offers high RMS frequency range of 10Hz 20MHz and can reliably measure 100uV RMS 300V RMS! The instrument uses purely analog techniques to accomplish this.
The theory of operation of the instrument is presented in details along with the challenges of adding digital circuits among such a sensitive analog domain. The upgrades use two modules which communicate through a serial interface and use an ADC to digitize the measured analog RMS value. A new GUI interface is developed to display a wide range of useful information simultaneously as well as historical data trend line. The instrument is used to perform several measurements including measuring the output noise of a DC/DC converter module.

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