What is the difference between the 80E03 and the 80E04?

What is the difference between the 80E03 and the 80E04?

The one difference is that the 80E04 has dual channel, true differential TDR capabilities added to it. When the TDR function is not used, the 80E03 and the 80E04 have identical capabilities. Both are 2 channel, 20Ghz electrical sampling modules for the CSA/TDS8000, CSA/TDS8000B and CSA/TDS8200 oscilloscopes.