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https://www.autonerdz.com/cgi/yabb2/YaBB.pl General Public Area >> PicoScope >> quality of trace / interferance https://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1222288781 Message started by smh on Sep 24^th, 2008 at 1:39pm

Title: quality of trace / interferance
Post by smh on Sep 24^th, 2008 at 1:39pm

Hello wise scope users.

I have had a pico for a short while but am unsure of the quality of the traces. I have attached an example below. It is a capture of a lambda selected from the "automotive" menu. The lead is attached to the signal wire (red) and component ground (black). It is the same if the ground lead is connected to the battery ground. My question is, is this the quality I should expect from the pico when checking lambda sensors?

Kind Regards

smh

https://www.autonerdz.com/cgi/yabb2/YaBB.pl?action=downloadfile;file=lambda_earth.psdata (549 KB | )

Title: Re: quality of trace / interferance
Post by Mick on Sep 24^th, 2008 at 2:57pm

check the propeties box on the right and see what your sample rate is
that will answer your question

Mick

Title: Re: quality of trace / interferance
Post by Carl Grotti on Sep 24^th, 2008 at 8:21pm

smh,

When you are sampling that high, yes. May I ask why you are scoping O2 sensors?

Title: Re: quality of trace / interferance
Post by Carl Grotti on Sep 24^th, 2008 at 10:09pm

If you do want to look at O2 activity, I'd use a chart recorder or an employed bit filter. Carry this over to the PicoScope user's special section if you are a member and we'll discuss this futher.

Regards,

Title: Re: quality of trace / interferance
Post by smh on Sep 25^th, 2008 at 11:09am

Mick

I see what you mean about the sample rate. However I am not sure why it is so high. I select the measurement from the "automotive" menu. I have not changed any settings. Am I overlooking a setting or should I not go with the preset measurements. I have been using the presets as I am still learning about advanced scopes.

Carl

I am not a member.

I am scoping lambda sensors purley to check functionality.

Regards

smh

Title: Re: quality of trace / interferance
Post by Mick on Sep 25^th, 2008 at 1:53pm

smh wrote on Sep 25^th, 2008 at 11:09am:

I don’t use the presets. You should as a beginner to get you in the ball park, but to get better results you need to experiment with your settings a little and watch what happens.

Too much sample rate on an o2 sensor will show lots of noise but I can work with that some cant.

How about signing up with Tom for a while it will be too your benefit

This is what a lot of samples would reveal, there are ways of cleaning this up but for me it’s ok.

Mick

lots_of_samples.gif (139 KB | )

Title: Re: quality of trace / interferance
Post by smh on Sep 28^th, 2008 at 5:46am

Mick

thank you for taking the time to reply. I will use my own settings and experiment some more.

thanks again

smh

Title: Re: quality of trace / interferance
Post by DaveH on Sep 28^th, 2008 at 11:35am

Hi Smh,
You could try this.....
Reducing noise<<<<<<click here

Regards
Dave

Title: Re: quality of trace / interferance
Post by smh on Oct 4^th, 2008 at 6:47am

Dave

Thank you for you reply, worked well

smh