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MSO 70604C threaded input interface
We have a MSO 70604C oscilloscope. We need to take a measurement of a relatively fast set of signals (~180 MHz) and we'd like to use the 50 Ohm termination of the oscilloscope. We only have TCA-1MEG input amplifiers. So we need to remove those amplifiers and engage directly with the threaded input into the scope. They look like they have a thread with a major diameter of about 0.375 inches (much bigger than a typical SMA type connector). Can anyone tell me what threaded interface these ports use?