messed up relative compression wave form, what is wrong?

Ask any non-NVH related questions about using PicoDiagnostics software here.

messed up relative compression wave form, what is wrong?

Postby jarrod27 » Wed Mar 13, 2013 4:49 am

what is going wrong here is it the settings, the scope, or the amp probe, it is all brand new on pre settings. Image
jarrod27
Newbie
 
Posts: 5
Joined: Sun Nov 27, 2011 4:53 pm

Re: messed up relative compression wave form, what is wrong?

Postby jarrod27 » Wed Mar 13, 2013 4:49 am

Even with the filter on the wave form still has the long tails. thanks
jarrod27
Newbie
 
Posts: 5
Joined: Sun Nov 27, 2011 4:53 pm

Re: messed up relative compression wave form, what is wrong?

Postby Alan » Wed Mar 13, 2013 5:13 am

That an interesting / odd waveform (which is a way of admitting I don't know the answer). Two possible guesses, the first is a loose connection from the clamp to the BNC connector on the PicoScope causing the signal to drop out - check turned / not loose. The second would be a loose connection on the vehicle - perhaps battery terminal.

Can you recapture but add channel B as battery voltage and then post again - I want to see if the battery voltage jumps up a bit when the current drops out. Best to post the screenshot as you have an the .psdata file for this one.
Alan
Pico Staff Member
Pico Staff Member
 
Posts: 239
Joined: Thu May 25, 2006 8:02 am

Re: messed up relative compression wave form, what is wrong?

Postby mapengo » Wed Mar 13, 2013 8:26 am

Try your scope in a different USB port Jarrod.

Doc...
mapengo
User
User
 
Posts: 16
Joined: Sat Aug 30, 2008 9:08 pm
Location: Warrington, Cheshire

Re: messed up relative compression wave form, what is wrong?

Postby MAE » Wed May 01, 2013 7:27 am

I thought i would jump on this post(hope you dont mind) as i am experiancing a similar problem, just purchased a pico advanced auto kit, i get the same thing on a battery test or comp test, have the same issue in pico scope software even connected to a battery sitting on the floor totally away from a vehicle i get erratic waveform. I have tried differant laptops, test leads and software versions. only thing i haven't subtitued is the pico(for obvious reasons). Does the pico team have any advice on this? i have been in contact with my supplier in australia and they currently dont have an answer
MAE
User
User
 
Posts: 20
Joined: Wed May 01, 2013 7:16 am

Re: messed up relative compression wave form, what is wrong?

Postby Lee » Wed May 01, 2013 12:29 pm

Is your laptop plugged into mains, could be noise through charging system within laptop.

Have you tried with laptop not plugged into mains?

Kind Regards

Lee - LMH Engineering Services :D
Lee
Advanced User
Advanced User
 
Posts: 79
Joined: Fri Feb 19, 2010 10:36 am

Re: messed up relative compression wave form, what is wrong?

Postby MAE » Wed May 01, 2013 12:40 pm

Tried plug and unplugged. No difference
MAE
User
User
 
Posts: 20
Joined: Wed May 01, 2013 7:16 am

Re: messed up relative compression wave form, what is wrong?

Postby Martyn » Thu May 02, 2013 7:18 am

Does it happen on any of the channels, or just one ?

Which software version are you running ? Help->About to Cut and Paste the Text
Martyn
Technical Support Manager
Martyn
Pico Staff Member
Pico Staff Member
 
Posts: 177
Joined: Thu Aug 11, 2011 7:43 am
Location: Cambridgeshire

Re: messed up relative compression wave form, what is wrong?

Postby MAE » Thu May 02, 2013 10:17 am

Haven't tried channel 3 or 4 yet but defiantly both 1 and 2

I tried the current version as of Tuesday last week and the earliest available version on the web page
MAE
User
User
 
Posts: 20
Joined: Wed May 01, 2013 7:16 am

Re: messed up relative compression wave form, what is wrong?

Postby Martyn » Thu May 02, 2013 10:32 am

and are you using the supplied blue USB cable directly between the scope and the laptop ?
Martyn
Technical Support Manager
Martyn
Pico Staff Member
Pico Staff Member
 
Posts: 177
Joined: Thu Aug 11, 2011 7:43 am
Location: Cambridgeshire

Next

Return to PicoDiagnostics software

Who is online

Users browsing this forum: No registered users and 0 guests