Hi Erik,
Wow, I can't believe how quickly you added the interval trigger function, and doing some quick initial tests using my TinySA (purchased from R&L Electronics) it looks like it will be more than adequate (not perfect as you noticed, but pretty darn good).? With zero span set to a frequency of 1.85 MHz I set my display time to 20 msec (actually results in 20.1msec) to look at slightly more than one complete 60 Hz sine wave cycle, and then I set the interval time to 16.7 msec to get the most stationary display of the RFI generated by my light dimmer which operates off of 60 Hz power.? I then set the interval timer to 33.6 msec to get the most stationary display, and also set it to 50.5 msec to get the most stable display.? Mathematically the intervals that should have worked well should have been 16.7 msec 33.3 msec, 50.0 msec so you can see the actual values I had to use are slightly different than the mathematically derived values but still pretty close and easy to compensate for by watching which direction the trace moves and adjusting the interval value accordingly.
I also tested the system using 50 Hz by setting my function generator to 50 Hz and generating a square wave to generate harmonics and once again listening up on 1.85 MHz in Zero Span Mode.? I selected a display time of 30 msec to capture slightly more than 1 complete cycle of a 50 Hz sinewave (actual display time was 30.2 msec), and I obtained the most stable display with the trigger interval time set to 40.4 msec while the mathematically correct value should have been 40.0 msec.?
I will do additional tests on the bench as well as out in the field looking at real powerline noise but to far it sure looks like you have added the feature I suggested and the results are more than acceptable with the understanding that slight movement of the display from right to left or left to right depending on the user entered value of interval time will happen and a completely stationary display is unlikely due to timer resolution constraints, etc).
I will provide more feedback as I do additional tests, but so far it looks very good, and certainly can't thank you enough for entertaining this added feature.
Don (wd8dsb)
