I have a program that logs (supposedly) 90 data points per second. I have a stopwatch that starts when the program opens and as each data point is logged the elapsed time of the stopwatch is also logged to keep track of the timing.

The data points are force values from a load cell with a rocket motor on top of it.

My program is telling me that my motor produced thrust for 1.923 seconds, but the video of the firing is telling me that it only produced thrust for 1.638seconds. The program had run for 393 seconds before the motor ignited, is it possible that after 393 seconds the stopwatch could be out of sync?


Ryan