Compression Test Signal Graph

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Jabsam
OneWave
OneWave
Posts: 25
Joined: Wed Mar 09, 2011 1:17 pm

Compression Test Signal Graph

Post by Jabsam »

Hi all,

I right-click the compression bar graph,and select the "Signal" to bring up a Signal Graph.Could you tell me what is the meaning of the Signal Graph ? Thanks in advance !
Attachments
compression.jpg

Brian Haley
Newbie
Posts: 3
Joined: Wed Aug 18, 2010 3:46 pm
Location: Olympia, WA - USA

Re: Compression Test Signal Graph

Post by Brian Haley »

Hi Jabsam,

From what I understand, the bumps represent the acceleration of engine RPM for each cylinder firing event.

You could use a sync probe or secondary lead on channel B as a reference point to help narrow down the faulty cylinder as shown here.
Pico Diagnostics.jpg
Brian Haley
Autonerdz.com

Jabsam
OneWave
OneWave
Posts: 25
Joined: Wed Mar 09, 2011 1:17 pm

Re: Compression Test Signal Graph

Post by Jabsam »

Brian Haley wrote: You could use a sync probe or secondary lead on channel B as a reference point to help narrow down the faulty cylinder as shown here.
Thanks,Brian。It help me much.Cheers

Gary20202
Newbie
Posts: 4
Joined: Sat Jan 31, 2015 12:18 am

Re: Compression Test Signal Graph

Post by Gary20202 »

How do you connect the sync probe, I have tried and never see the sync signal on the channel B. Obviously I am missing something in my setup.

Thanks for any help.

Gary

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