Ah I understand now. This is just saying that the device used is able to detect a difference in the time of flight of the ultrasonic signal of less than 100 picoseconds. As for the number of samples in a given time period, the parameter you've updated is the correct one to change the time between each sample. After programming the device, did you hit the request update button again? If yes, this would make sense as this would overwrite your setting with the new one from the GUI each time you request an update. You'd need to avoid hitting request update, or just make sure that you override the value set by the GUI again in your code in order to ensure that your setting for USS_SYS_MEASUREMENT_PERIOD remains.
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