DSO751SR 25.000MHZ DSO751SR 33.000MHZ DSO751SR 50.000MHZ DSO751SR 64.000MHZ DSO751SR 75.000MHZ DSO751SR 8.4672MHZ DSO751SR25.000MHZ DSO751SR-49.152MHZ DSO751SR-64.000MHZ DSO751SRAB-66.6666MHZ