Please help on capturing two signals

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Please help on capturing two signals

Postby amcutem » Thu Sep 29, 2011 5:21 am

I want to capture two signals:

1. Injector signal, negative pulsed
2. COP, positively pulsed 4volts

Is there a way to do this?
amcutem
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Re: Please help on capturing two signals

Postby Lee » Tue Oct 04, 2011 2:20 pm

Dear Sir/Madam

Please find the file attached which should suit your requirements
Injector vs COP.psdata
(7.44 KiB) Downloaded 844 times

In terms of set up,

Channel A - BLUE has been set up to look at 100V Signal, common injectors can vary between 60 - 80 Volts so 100V range should comfortably accomodate the one you wish to capture. It has been set up with the X20 probe in conjunction with using the 20:1 attenuator as you havent mentioned which scope you have so this will protect the scope input if your using an older 200 series or 3000 series Scope.

Hardware wise you need to set the channel a up as follows using the following accessories:-

SCOPE > 20:1 Attenuator > BNC to 4mm Test Lead > Acupunture Probe

Channel B - RED has been set up to look at a 5V signal. This will appear in the lower half of the screen and this should give you in which im assuming is the trigger signal for the COP Unit.

Hardware wise you need to set the channel b up as follows using the following accessories:-

SCOPE > BNC to 4mm Test Lead > Acupunture Probe

The timebase has been set up to 20ms/div. This should hopefully give you 2 Injector signals on the screen i.e. 720 degrees of engine rotation in which you can also see the trigger signals.

I have also added a repeat trigger to channel A so this should hold the signal steady to make it easy for you to look at. If for any reason you cant get an Injector or COP signal and the connection you have made are all good then simply switch the trigger off as it maybe not right for this particular engine your working with.

Be advised you may need to alter the timebase according to the engine/vehicle you are working with but this should help get you on your way.

If you need any further assistance please dont hesitate to repost or get in touch.

Kind Regards

Lee - Automotive Technical Specialist :D
Lee
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