Oscilloscopio digitale calibrato Tektronix TDS 3054 500 MHz 5GSa/sec 4CH

DPOs are far less likely to have blind periods due to excessively one-sided resource allocation (or inability to multi-task). This DPO can run 3600 acquisitions/second to avoid blind spots. BTW, analog scopes also have "blind" periods briefly during sweep retrace, and variably during "holdoff", if you choose it.

eBay