Teledyne LeCroy ArbStudio - Manual (Page 176)

ArbStudio
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On the Edit Segment dialog, set the Phase to 180, and Duration to
15µs.
Now, repeat this step and create a second entry in the Phase
Modulation List. Set its Phase to 90, and Duration to 30µs.
4. Now, double-click Settings under Channel 1 (DDS) on the Device
Control Tree. (Channel 1 can be any DDS channel you have
configured under Arbitrary Waveform Generator operating mode in
your workspace.)
The DEV1 Settings Ch 1 pop-up screen is shown.