I have purchased a used DPO7104 Oscilloscope to replace my TDS7104 Oscilloscope. I would like to use my DPO7104 with my existing test setup, which includes using an ADA400A Differential Preamplifier. Is it possible to connect the ADA400A to the DPO7104? Is it advisable to use the preamplifier with the DPO7104 Oscilloscope?