Investigate pirani gauge noise margins

rahix commented

2024-09-29 21:47:04 +00:00

Owner

Right now, pirani gauge values are averaged in succd using a 10 second sliding window. This provides stable values, but sometimes a slow response (e.g. it cannot accurately capture venting procedures).

It should be investigated what the actual noise margin of the pirani gauge measurements is. And whether additional electrical measures should be implemented to improve shielding.

Right now, pirani gauge values are averaged in succd using a 10 second sliding window. This provides stable values, but sometimes a slow response (e.g. it cannot accurately capture venting procedures). It should be investigated what the actual noise margin of the pirani gauge measurements is. And whether additional electrical measures should be implemented to improve shielding.

rahix added the

succbone

label 2024-09-29 21:47:04 +00:00

q3k commented

2024-09-29 21:54:44 +00:00

Owner

The window is now 1 second (as we tick at 100Hz, but still capture 100 samples). It's actually a bit too noisy now IMO.

Should we implement some proper DSP to filter out high frequencies?

The window is now 1 second (as we tick at 100Hz, but still capture 100 samples). It's actually a bit too noisy now IMO. Should we implement some proper DSP to filter out high frequencies?

rahix commented

2024-09-30 01:19:25 +00:00

Author

Owner

First of all, I'd like to try lowering noise by electrical means. No sense in starting to do filtering until we know we have done the best we can at providing a good signal to the ADC. Let's see how far we can get and then look into signal processing solutions afterwards.

Investigate pirani gauge noise margins #6