The addition of a second channel allows you to generate two waveforms, either independent or phase-related to each other. The second channel output can be phase-synchronized to the first channel or to an external input. Such capabilities are especially useful if you are doing modern testing, tone-sequence generation, DTMF generation, FSK generation, or other operations where two outputs are required.
Option 002 is a precision voltage amplifier that increases the output voltage 10-fold. Maximum voltage is now +/-100 volts, or 200 volts peak-to-peak in ac mode. The second channel slot is used for the high-voltage option. It is not possible to have both second channel and high-voltage options in the same instrument.