Teardown & Repair of a Rohde & Schwarz SMBV100A 9kHz – 3.2GHz Vector Signal Generator

In this episode Shahriar takes a look at a R&S SMBV100A Vector Signal Generator which does not produce the correct output level. Despite passing all self-tests and ALC checks, the output power level is far below expectation. The output also shows a high-pass frequency response.

The (heavily simplified) block diagram of the instrument is examined and discussed. The teardown of the unit reveals the output RF board which is presented in details. Since the instrument cannot detect the failure internally, it is very likely that the fault is part of the RPP output RF relay. The circuitry as well as the datasheet of the components are examined. Measurements show that the output RF relay is never activated due to a faulty PMOS transistor. After transistor is replaced, the unit shows the correct output level. The baseband generator functionality is also verified.

You can purchase the Metabo HPT (Hitachi) Cordless Screwdriver Kit from my Amazon Affiliate Link.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

  • Social Media

    twittergooglepluswordpressyoutuberedditrssemail
  • Administrator

  • Archives

This site is protected by Comment SPAM Wiper.