I found datasheets for AQV224 and it matches my package.
I was trying to trace the 50ohm mode path in this oscilloscope, however, I didn't see a 50ohm resistor. My assumption was this "device" had some sort of internal 50ohm load. Looking at the datasheet, and the picture of the component on the PCB, it looks like B type connection, but it doesn't have 50ohms in this condition.