Shooter Sampling Rate and Counter Averaging

[Tom Line]

Ether - I'm not sure why you deleted your posts. The first one pointing to the paper helped me. Once upon a time when you first put that out I planned to throw it in excel and show my controls members how it worked. I did that last night, and with a couple tweaks found solutions that work with my 128 count encoder for both 3500 and 7500 with resolutions of +/- 2 and 4 rpm each at 10ms loop timing.

-Edit: Just saw your update that said there was a problem with your calculations. I look forward to the update so I can recheck my numbers.

[Ether]

Originally Posted by Tom Line

Ether - I'm not sure why you deleted your posts. The first one pointing to the paper helped me. Once upon a time when you first put that out I planned to throw it in excel and show my controls members how it worked. I did that last night, and with a couple tweaks found solutions that work with my 128 count encoder for both 3500 and 7500 with resolutions of +/- 2 and 4 rpm each at 10ms loop timing.

-Edit: Just saw your update that said there was a problem with your calculations. I look forward to the update so I can recheck my numbers.

Hi Tom,

I'm working on it. Short story: I believe the calculations as shown are correct for a given true rpm but: small variations of the true rpm around the given value can cause the jitter pattern to change and affect the jitter you would actually see in real life. I took the paper down because I did not explain this clearly and didn't want to mislead. I need to provide more graphs and explain them better.

[Tom Line]

Originally Posted by Ether

Hi Tom,

I'm working on it. Short story: I believe the calculations as shown are correct for a given true rpm but: small variations of the true rpm around the given value can cause the jitter pattern to change and affect the jitter you would actually see in real life. I took the paper down because I did not explain this clearly and didn't want to mislead. I need to provide more graphs and explain them better.

Ok. If it's only a question of small variations then I'm not terribly worried. When I compare our plan this year with the setup we used last year, there is an order of magnitude improvement in jitter.