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Noknroll

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Reply with quote  #1 
Is any one using these?
do the 50 & 60 Hz notch filters block or only collect 50 & 60 Hz.
Same for the Band pass filters eg  20-150Hz BP, only collects or blocks 20 -150Hz?
still looking for a solution to exclude some GMF that I posted somewhere else on this forum and driving along this morning I thought maybe this (filtering) could be a solution?
Noknroll

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Reply with quote  #2 
Hmm, no wonder I didnt get a response to this topic, somehow it doesnt have any content?

Ok, so what I thought i posted went something like this......

Is any one using notch or band pass filters?
Do 50 & 60 Hz notch filters only collect or discard 50 0r 60Hz depending on whitch one you selected.
And do band pass filters collect or discard the band width selected? For example does 20 - 150Hz BP filter collect or discard 20 - 150Hz
Still trying to figure out a way of seeing past GMF on some mill gearboxes to see if any bearing faults are buried in the "GMF noise"
I could use the "D" button but would like to find another way if possible.

Thanks in advance for any replies or suggestions
RustyCas

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Reply with quote  #3 
A "band pass" filter passes the energy that is between the 2 settings, just like a low pass filter passes the energy below (lower than) the stated frequency, and a high pass filter passes that above (higher than) the stated frequency.

The link below explains it in some detail, especially the finer points.

http://blog.prosig.com/2011/10/04/understanding-filter-characteristics/

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Noknroll

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Reply with quote  #4 
Thanks rusty
So from my understanding of the link you posted, a band pass filter might just work in my case.
Thanks again.
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