The R&S RT-ZA50 is a breakout box that routes the Rohde & Schwarz probe interface 1 to the following standard connectors: USB-C for power and control, SMA for the signal and DC jack for the additional power supply.
Combining the R&S RT-ZA50 probe interface extender with the R&S RT-ZA51 probe adapter to 3.5 mm brings the Rohde & Schwarz probe interface 1 closer to your test setup. This allows you to increase the distance between the DUT and your Rohde & Schwarz oscilloscope.