I realized that in the schematic the second output is grounded so I don't think I will even bother to test it, I can't imagine they need to use an abnormal dac for generating a sweep wave form.
There is just a buffered voltage reference for vref and a IV converter+Pi RC filter for Iout1 and Iout2 is grounded, I don't think its doing anything odd.
I guess the multiplication feature is kind of odd ball... I don't believe its used here.
Maybe the company bought 50,000 of them and they decided to use it instead of a traditional dac?