MAF Signal

Ask any questions about using PicoScope Automotive software here.
s4c
OneWave
OneWave
Posts: 44
Joined: Thu May 01, 2008 8:50 am

MAF Signal

Post by s4c » Mon Jun 10, 2013 11:43 pm

Hi

I have a Misti MAF signal which is in Htz. Can anyone tell me how to graph the signal so I can look for glitches?

Regards

Simon

Alan
Pico Staff Member
Pico Staff Member
Posts: 255
Joined: Thu May 25, 2006 8:02 am

Re: MAF Signal

Post by Alan » Tue Jun 11, 2013 4:42 am

Hi,

Try this guide http://www.picoauto.com/tutorials/testi ... nsors.html

If that does not do the job let us know as there is now also an option in the software to plot frequency vs time that works on all of the scopes.

Regards
Alan

s4c
OneWave
OneWave
Posts: 44
Joined: Thu May 01, 2008 8:50 am

Re: MAF Signal

Post by s4c » Tue Jun 11, 2013 7:23 am

Hi

Thanks for the link. I have seen that one before.

Can you give me the info for mapping over time?

Regards

Simon

Alan
Pico Staff Member
Pico Staff Member
Posts: 255
Joined: Thu May 25, 2006 8:02 am

Re: MAF Signal

Post by Alan » Sat Jun 15, 2013 11:32 am

Hi,

If you are capturing a new signal then I suggest you use the frequency option available in the PicoScope 4000 - select from the AC/DC drop down box.

If you have already captured the signal as a digital square wave then you can display as air flow using one of the maths channel options. From the tools menu you need maths channels, create then select advanced. I dont have a scope with me to show how to do this so for now please post your waveform as a .psdata file here and one of us will sort out an equation for you.

s4c
OneWave
OneWave
Posts: 44
Joined: Thu May 01, 2008 8:50 am

Re: MAF Signal

Post by s4c » Sat Jun 15, 2013 11:51 am

HI Alan

Please have a look at the attached post. If you could work it out it would be great. Also, if you could show me the workings for future ref that would also be great.

Regards

Simon
Attachments
1996 4G93 TPS and AFM.psdata
(25.77 KiB) Downloaded 360 times

User avatar
Robski
Advanced User
Advanced User
Posts: 597
Joined: Tue Sep 14, 2010 6:36 pm
Location: Yorkshire

Re: MAF Signal

Post by Robski » Sat Jun 15, 2013 12:42 pm

look in automotive presets it is in there.........

User avatar
Fat Freddy
TwoWaves
TwoWaves
Posts: 314
Joined: Fri May 04, 2012 4:52 am

Re: MAF Signal

Post by Fat Freddy » Sat Jun 15, 2013 12:47 pm

Your sample rate is way too low. X4 at least - avoid aliasing. You want a nice digital signal.

HTH
FF

User avatar
Robski
Advanced User
Advanced User
Posts: 597
Joined: Tue Sep 14, 2010 6:36 pm
Location: Yorkshire

Re: MAF Signal

Post by Robski » Sat Jun 15, 2013 3:18 pm

Fat Freddy wrote:Your sample rate is way too low. X4 at least - avoid aliasing. You want a nice digital signal.

HTH
FF
agree at 300+µs iirc :shock:

Valhalla
TwoWaves
TwoWaves
Posts: 66
Joined: Sat May 18, 2013 10:22 pm

Re: MAF Signal

Post by Valhalla » Sat Jun 15, 2013 10:10 pm

Robski wrote:look in automotive presets it is in there.........
Where it states that the frequency option is available from 4000series Picoscope onwards. If you look at Simon's waveform again, the properties show his scope to be 3000series. That could be why Simon cannot find this.

User avatar
Robski
Advanced User
Advanced User
Posts: 597
Joined: Tue Sep 14, 2010 6:36 pm
Location: Yorkshire

Re: MAF Signal

Post by Robski » Sat Jun 15, 2013 10:27 pm

Valhalla wrote:
Robski wrote:look in automotive presets it is in there.........
Where it states that the frequency option is available from 4000series Picoscope onwards. If you look at Simon's waveform again, the properties show his scope to be 3000series. That could be why Simon cannot find this.
I never opened the properties tab in this instance I measured the sample rate with the time cursors .......

Post Reply