Mr. Lincoln, Thanks for using NI Developer Exchange! Unfortunately, the NI 5102 is not able to perform delayed triggering. Delayed triggering is supported by the NI 5112 for PXI, so this functionality appears in the NI-SCOPE instrument driver. The NI 5102 and NI 5911 also use this driver, but cannot support this feature in hardware. The NI-SCOPE driver call "ConfigureTriggerSource" is only meant to have a non-zero delay for the NI 5112 for PXI. One alternative (without changing hardware) is to start sampling immediately, then calculate how many points to delete in software to reach the desired starting point. Hopefully this answers your question.