DSO751SB 20.800MHZ DSO751SB 24.000MHZ DSO751SB 27.120MHZ DSO751SB 3.2768MHz DSO751SB 32MHZ DSO751SB 33.250MHZ DSO751SB 40.000MHZ DSO751SB 6.7584MHZ DSO751SB 62.000MHz DSO751SB 83.330MHz