At present this page says TDS 694C and TDS 794D have Tekprobe SMA probe connectors.
In reality those have Tekprobe BNC connectors, which on these oscilloscopes are always in the 50 ohm mode.
(All other oscilloscopes in the TDS 600.and TDS 700 series have Tekprobe BNC connectors which are switchable between 50 ohm and 1 M ohm.
I think that might be the reason for the erroneous listing of use of SMA.)
I´m changing the page to reflect this.
/Davids