VR sensor positive going zero crossing signal
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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VR sensor positive going zero crossing signal
Mocked up a 36-1 trigger wheel and VR sensor (at .030" gap). With a scope i get the same pattern as the manuals VR sensor positive going zero crossing which is good. Question: is this pattern happening at the missing tooth?
48 Chev Pick Up, 455 Olds Motor, MSII V3, MSD Ign, TunerStudio MS, Emb Code V2.920, LC1 WB, VR with 36-1 Wheel
Re: VR sensor positive going zero crossing signal
I'll help you if I can, but I'm not certain what question you are asking?
Are you not able to see the missing tooth portion on the scope?
For reference, here is a scope shot of my 36-1 wheel, and my single tooth cam sync.
http://img7.imageshack.us/img7/64/camsyncee9.png
As you can see, the red trace is the 36-1 wheel, and blue trace is the cam sync.
It's important to capture the steep crossing through zero. So in the cam sync, it would be steep through zero on the way down, from positive to negative. This is the direction coming from sensor. You must distinguish what your VR circuit is doing to the signal when it arrives at the IRQ as a square wave, which is what the software decodes. Conventional V3.0 circuit boards invert the signal from signal to IRQ, so this trace should be programmed for going high (which is backwards from what you see at the sensor).
On the 36-1 trace, as you can see, you can't distinguish polarity unless you look at the missing tooth portion. In this pic, the red trace 'floats' up at the missing tooth, and also has the steep crossing from positive to negative. Again, important to consider whether the VR circuit inverts the signal when arriving at IRQ as square wave.
Can you share the scope shot that you have?
Are you not able to see the missing tooth portion on the scope?
For reference, here is a scope shot of my 36-1 wheel, and my single tooth cam sync.
http://img7.imageshack.us/img7/64/camsyncee9.png
As you can see, the red trace is the 36-1 wheel, and blue trace is the cam sync.
It's important to capture the steep crossing through zero. So in the cam sync, it would be steep through zero on the way down, from positive to negative. This is the direction coming from sensor. You must distinguish what your VR circuit is doing to the signal when it arrives at the IRQ as a square wave, which is what the software decodes. Conventional V3.0 circuit boards invert the signal from signal to IRQ, so this trace should be programmed for going high (which is backwards from what you see at the sensor).
On the 36-1 trace, as you can see, you can't distinguish polarity unless you look at the missing tooth portion. In this pic, the red trace 'floats' up at the missing tooth, and also has the steep crossing from positive to negative. Again, important to consider whether the VR circuit inverts the signal when arriving at IRQ as square wave.
Can you share the scope shot that you have?
__________________________
Sequencer (beta) accumulating miles on E12 M90 635csi
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Sequencer (beta) accumulating miles on E12 M90 635csi
& Squirted Pontiac Bubbletop
Re: VR sensor positive going zero crossing signal
I really appreciate the help. You did answer my question. I guess im in such a learning curve that i really didnt ask the question correctly. I wish i could share my scope pattern but i didnt save it after mocking up the VR sensor. Ill know better next time. Again like any newbe, i need all the help i can get! Thanks.
48 Chev Pick Up, 455 Olds Motor, MSII V3, MSD Ign, TunerStudio MS, Emb Code V2.920, LC1 WB, VR with 36-1 Wheel