TNP #43 - Rohde & Schwarz URE2 DC - 25MHz 300V RMS Voltmeter Teardown, Repair & Experiments
In this episode Shahriar takes a look at a fault Rohde & Schwarz URE2 which is a highly sought after RMS voltmeter. The ability of the RE2 to provide accurate RMS measurement up to 25MHz as well as provide DC measurement makes it an excellent instrument for characterizing DC/DC converter output noise characteristics.
The faulty instrument can measure AC, however no DC measurement can be made. The unit also occasionally generates an error code 0080 which points to a fault in the main analog board. Teardown of the instrument reveals a pair of front-end relays responsible for mode switching which are the likely cause of the DC measurement problem. The relays are replaced and the instrument returns to full operation. The performance and functionality of the unit is verified through several experiments.
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