The problem of sampling frequency

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Hi there,
   I  purchased a DSO2090. I used it to measure the power of other equipment. I check the output file and found it can only output 98786 data at a time, but the sampling frequency of this oscillscope it 100M/s. I dont know how to set its sampling frequency. I spent 3 days on it and have no solution. Could u give me some advice? Thank you.
Alex