Create random square wave

I would like to create random square wave as follows:

ON time: 0.0 to 3.0 Milli second OFF time: 0.1 to 10.0 Milli second Voltage 5 VDC Number of cycle: 10 lakhs Random square waves to be created from above conditions and save as CSV format to use as arbitrary waveform.

I have Tektronix AFG31000 series function generator and Tektronix MSO 4 series oscilloscope.

Any recommendations to create in MS Excel or online?