Search found 40 matches

by eric989
Fri Jul 19, 2019 2:54 pm
Forum: PicoScope 6 Automotive software
Topic: Compression testing using the WPS500 Pressure Transducer
Replies: 16
Views: 29945

Re: Compression testing using the WPS500 Pressure Transducer

Using the same engine and cylinder above only now with a compression gauge we can see just how challenging cylinder measurements can be as a conventional gauge reads approx. 32.5 bar pressure! Why? Hi Steve, I encountered the case that the the reading from conventional gauge is much larger than the...
by eric989
Wed Jan 31, 2018 9:17 am
Forum: Diagnostic discussion
Topic: Odd COP secondary ignition waveform
Replies: 4
Views: 6841

Re: Odd COP secondary ignition waveform

Hi Ben,

You are right. Yes, we need to invert the waveform. I was misunderstood by the user before. Here I got the psdata from him. The waveform looks normal. Thanks.

And thank you Liviu2004.

Eric
Inverted.png
by eric989
Mon Jan 29, 2018 7:13 am
Forum: Diagnostic discussion
Topic: Odd COP secondary ignition waveform
Replies: 4
Views: 6841

Odd COP secondary ignition waveform

Hi,

Can somebody comment the waveform below? It looked very odd, the Dwell Period is Positive and the Burn Time is Negetive. It's from a Hyundai Sonata, the waveform from all 4 cylinders are same, and the vechicle vibrates at idle.

Thanks,
Eric
1.jpg
by eric989
Fri May 20, 2016 7:16 am
Forum: PicoDiagnostics NVH
Topic: Tire correction factor.. What is this??
Replies: 4
Views: 21376

Re: Tire correction factor.. What is this??

Thank you Steve. I asked the question before, and only knew the Tyre correction factor related to pressure,ware etc.. Now, I know how to calculate it. :D Did you have a typo here: ODB/Tyre Circumference method 11.34 Hz Engine RPM/Transmission Ratio method 11.90 Hz Apply Tyre correction factor to the...
by eric989
Thu Apr 28, 2016 1:11 am
Forum: PicoDiagnostics NVH
Topic: Can singel axis NVH convert to 4 axis NVH
Replies: 2
Views: 5879

Re: Can singel axis NVH convert to 4 axis NVH

Hi Chris,

Understood it. It's better to have 2 separate 3 axis output interfaces for "4 axis kit". Thank you for the detailed reply.

Eric
by eric989
Thu Apr 21, 2016 9:11 am
Forum: PicoDiagnostics NVH
Topic: New features of Beta NVH software
Replies: 11
Views: 23371

Re: New features of Beta NVH software

The TA149 interface have 3 output to Scope. Which output should be connected to scope when using multiple sensors mode selected microphone? I thougt any output should be ok, and the signal from the 3 output would be same. Right?

Thank you, Steve.

Eric Chen
by eric989
Thu Apr 21, 2016 8:45 am
Forum: PicoDiagnostics NVH
Topic: Can singel axis NVH convert to 4 axis NVH
Replies: 2
Views: 5879

Can singel axis NVH convert to 4 axis NVH

For the singel axis NVH (PP858) users, Can they just buy a 3 axis NVH(PP986) to combine with the PP858, then they can have a 4 axis kit?

Thank you.
Eric Chen
by eric989
Mon Mar 14, 2016 10:39 am
Forum: Diagnostic discussion
Topic: question for direct injection current waveform
Replies: 5
Views: 8580

question for direct injection current waveform

Hi all, Can direct injection current waveform tell the time of pintle lifts off its seat? There is no obvious hump point on the current waveform like the injector located on inlet manifold. The file I downloaded from waveform library. I can tell the injector closed time, Can somebody tell the start ...
by eric989
Wed Feb 17, 2016 6:40 am
Forum: PicoScope 6 Automotive software
Topic: reference waveform feature
Replies: 4
Views: 9252

Re: reference waveform feature

Hi FF,

Great, many thanks. I never noticed there is a delay option for the reference waveform before.
Cheers,

Eric
by eric989
Tue Feb 16, 2016 6:17 am
Forum: PicoScope 6 Automotive software
Topic: reference waveform feature
Replies: 4
Views: 9252

reference waveform feature

Hi Steve, Hare are you? I read your cases studies, several times I saw you overlaid the reference waveform perfectly. How can you achieve that? Take the follow image for example, I mean how can you make the 4 TDCs in one vertical line? I noted the Trigger set as None. When I use the reference wavefo...