Compression Test Signal Graph

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Compression Test Signal Graph

Postby Jabsam » Tue May 10, 2011 10:05 am

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 !
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compression.jpg
Jabsam
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Re: Compression Test Signal Graph

Postby Brian Haley » Tue May 10, 2011 4:06 pm

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
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Re: Compression Test Signal Graph

Postby Jabsam » Wed May 11, 2011 1:11 am

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
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Re: Compression Test Signal Graph

Postby Gary20202 » Sat Jan 31, 2015 2:26 am

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.

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