Dear all,
These days, I tested two cars' lambda sensor,all are Zirconia Lambda sensor.
The waveform is very strange, at least for me.I know little about lambda sensor. There are a lot of vertical lines upon the traces.And the traces are very big/wide.
Could you tell me that what the traces meaning ? Is there any fault in the sensors or I make a wrong Picoscope software setting ?
I enclosed the waveform files for you. Many thanks .
Change your collection time to 1s/div or 2s/div as a start then increase to fast idle and back to idle to see it reacting to changes in oxygen.
It is working
The O2s in your captures are working fine. The reason you have a fat trace with all the vertical lines is noise from ignition events etc. Filter the signal to shave all that hair off for a cleaner signal.
Just curious...why are you using PicoScope 5? Looks like you did this with a 3000 series scope? PicoScope 5 cannot make full use of the capabilities of that scope. PicoScope 6 will.
_________________
Tom Roberts
(The Picotologist) http://www.autonerdz.com
skype: autonerdz
THE PicoScope Automotive Authority
In North America
Change your collection time to 1s/div or 2s/div as a start then increase to fast idle and back to idle to see it reacting to changes in oxygen.
It is working
The O2s in your captures are working fine. The reason you have a fat trace with all the vertical lines is noise from ignition events etc. Filter the signal to shave all that hair off for a cleaner signal.
Just curious...why are you using PicoScope 5? Looks like you did this with a 3000 series scope? PicoScope 5 cannot make full use of the capabilities of that scope. PicoScope 6 will.
_________________
Tom Roberts
(The Picotologist) http://www.autonerdz.com
skype: autonerdz
THE PicoScope Automotive Authority
In North America
Hi Tom,
About "Filter the signal to shave all that hair off for a cleaner signal." Yon mean activate Lowpass Filtering ?
I am always using PicoSope 6, not PicoScope 5. The chevrolet lambda.psd file I captured with 3423. The toyota lambda.psd file I captured with 4223.
It is interesting that I can filter the signal of toyota lambda.psd file, but can't filter the signal of chevrolet lambda.psd. I thought the filter function is within the software, have no relationship with the hardware.
The reason I thought you were using Pico 5 is because psd is a Pico 5 extension. Pico 6 saves psdata file extensions. I see now they appear to be psdata files renamed to psd. I'm easily confused
_________________
Tom Roberts
(The Picotologist) http://www.autonerdz.com
skype: autonerdz
THE PicoScope Automotive Authority
In North America
I have the same problem when I browse on an iphone or ipad. I don't know if there is an "app for that" yet?
Often people post their waveforms in a common image format. A *.gif is ideal.
Eric
Sorry for my scepticism. I didn't know that the psdata file type was not accepted for upload. Weird that isn't it!
As Nigel has suggested, its a good idea to have a lot more time on screen than you have selected. The Automotive pre sets are a little dated now. The newer software & hardware allow you capture massive amounts of data & the superb zoom facilities mean that you can analyse any part of your capture with ease.
As for the noisy signal, I wouldn't be too concerned about it. Yes it can be filtered out, but in reality you can see the trend & you still have the ability to see the detail needed to draw your conclusions. Don't forget to "challenge" the sensor when scoping. Snap throttle tests can reveal a lot!