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Author Topic: Trigger noise?? dual hall trigger  (Read 11782 times)

Offline Arvid

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Trigger noise?? dual hall trigger
« on: March 22, 2009, 08:22:33 am »

Can someone check my trigger wav?  :)  I wonder if I have some noise prblemer.  ??? I use firmware 1.1.47.

Email aolause@online.no
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Offline rob@vems.co.uk

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Re: Trigger noise?? dual hall trigger
« Reply #1 on: March 22, 2009, 01:48:53 pm »
Noise is unusual on Hall setups, it one of their advantages.
What engine and trigger setup are you using?
How did you record the wav?
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Offline Arvid

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Re: Trigger noise?? dual hall trigger
« Reply #2 on: March 22, 2009, 06:59:53 pm »
Quote from: rob@vems.co.uk on March 22, 2009, 01:48:53 pm
Noise is unusual on Hall setups, it one of their advantages.
What engine and trigger setup are you using?
How did you record the wav?

It is a volvo B230. Gt1 hall trigger, 2 bolts on flywheel, and original volvo B230 distributor (Bosch) with hall trigger, which is rebuild to give one signal hall trigger camsync. (4+1).
I record the wav with the notebook sound card.

http://www.vems.hu/wiki/index.php?page=ElectronicDesign%2FSoundRecorder

I've sent the wav file to you by email :)
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Offline rob@vems.co.uk

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Re: Trigger noise?? dual hall trigger
« Reply #3 on: March 23, 2009, 01:05:16 am »
So I've stuck it in Audacity and this is the wave form:

I've never seen anything like that before...
What type are the triggers?
« Last Edit: March 23, 2009, 01:09:56 am by rob@vems.co.uk »
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Offline GintsK

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Re: Trigger noise?? dual hall trigger
« Reply #4 on: March 23, 2009, 02:19:38 am »
Graphs are maimed by AC character of oscilloscope. And signal is to "loud".
IMO normal signals.
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Offline Arvid

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Re: Trigger noise?? dual hall trigger
« Reply #5 on: March 23, 2009, 04:54:23 am »
Quote from: rob@vems.co.uk on March 23, 2009, 01:05:16 am
So I've stuck it in Audacity and this is the wave form:

I've never seen anything like that before...
What type are the triggers?

 Crank:Honeywell Gt1 hall trigger.
 Camsync: Bosch hall trigger  (volvo b230 distributor)
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Offline rob@vems.co.uk

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Re: Trigger noise?? dual hall trigger
« Reply #6 on: March 23, 2009, 03:07:55 pm »
Apparently the sound card isnt good at sampling a Hall trigger because it has a decoupling capacitor that will screw up the signals - and make them look like that ???

What are the symptoms that are leading you to suspect noise?
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Offline Arvid

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Re: Trigger noise?? dual hall trigger
« Reply #7 on: March 23, 2009, 10:26:45 pm »
Quote from: rob@vems.co.uk on March 23, 2009, 03:07:55 pm
Apparently the sound card isnt good at sampling a Hall trigger because it has a decoupling capacitor that will screw up the signals - and make them look like that ???

What are the symptoms that are leading you to suspect noise?

Have problem with misfire. (dvell 1ms 1800-2100rpm misfire) (dvell 3ms 1200-1400rpm misfire)   ???
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Offline PeepPaadam

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Re: Trigger noise?? dual hall trigger
« Reply #8 on: March 24, 2009, 03:14:16 pm »
When misfire gets worse with increased dwell, then it's time to check the coils and wires, one of them probably sparks to chassis.
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