How to generate linear anologue voltage output using DAQpad-6015?

[Steve_I]

I am using DAQpad-6015 (USB). There are two chanels being able to output anologue voltage voltage. How to control the sweep rate linearly?

 (not sinawae, square or triangle). Please help me out.

Thank you in advance.

[Steve_I]

I mean how to get a linearly sweepping voltage output