PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
Finding Correct Frequency ranges
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Mpylypchuk
- Newbie
- Posts: 7
- Joined: Thu Jan 05, 2023 9:20 pm
Finding Correct Frequency ranges
Hi there
I'm struggling with finding correct frequency ranges for a given signal
It could be a crank signal or even starter current
I'm always stumped at finding the correct frequency range to use. I tried the rulers to see if that would work and after plugging in a range i'm left with no trace at all.
Another weird that happens specifically with frequency math channels is that when I created a channel and then later on go back to edit it, the program completely crashes!!
Maybe someone could pitch in! Thanks
I'm struggling with finding correct frequency ranges for a given signal
It could be a crank signal or even starter current
I'm always stumped at finding the correct frequency range to use. I tried the rulers to see if that would work and after plugging in a range i'm left with no trace at all.
Another weird that happens specifically with frequency math channels is that when I created a channel and then later on go back to edit it, the program completely crashes!!
Maybe someone could pitch in! Thanks
-
Mpylypchuk
- Newbie
- Posts: 7
- Joined: Thu Jan 05, 2023 9:20 pm
Re: Finding Correct Frequency ranges
Here is an example file. Shows battery voltage and starter current of a Peterbilt truck
In this case I want to try a math channel that displays frequency. I want to experiment with this file to be able to show rpm of the starter, Nm, etc... Something just wanted to try from a post I found here.
However I get stuck when trying to find the right frequency range. I have tried setting cursors between two of the "compression peaks" and the rulers say 6 hz. When choosing either a range of 3 - 6 Hz, 0 - 6Hz, or the others I have tried, I get nothing to display. What am I missing?
In this case I want to try a math channel that displays frequency. I want to experiment with this file to be able to show rpm of the starter, Nm, etc... Something just wanted to try from a post I found here.
However I get stuck when trying to find the right frequency range. I have tried setting cursors between two of the "compression peaks" and the rulers say 6 hz. When choosing either a range of 3 - 6 Hz, 0 - 6Hz, or the others I have tried, I get nothing to display. What am I missing?
- Attachments
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- Peterbilt_battery voltage and current experiment.psdata
- (28.24 MiB) Downloaded 127 times
Re: Finding Correct Frequency ranges
Obviously the crash should not happen!
I think the issue - at least with the example you posted is that you do not have a full screen of just the data you want to examine. Picoscope sees the first Highs and low of the data - the current for example and works out where to take it's frequency measurement at say 1.1kA - then it never sees the data pass that point again.
I can't find a way to truncate the data or tell the maths channel to only look at a certain time window.
I asked the question about how it works a while back viewtopic.php?p=103156#p103156
There is an older guide to doing exactly what you are trying to
https://www.picoauto.com/library/traini ... ool-part-1
I think the issue - at least with the example you posted is that you do not have a full screen of just the data you want to examine. Picoscope sees the first Highs and low of the data - the current for example and works out where to take it's frequency measurement at say 1.1kA - then it never sees the data pass that point again.
I can't find a way to truncate the data or tell the maths channel to only look at a certain time window.
I asked the question about how it works a while back viewtopic.php?p=103156#p103156
There is an older guide to doing exactly what you are trying to
https://www.picoauto.com/library/traini ... ool-part-1