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General Public Area >> PicoScope >> zero crossing
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Message started by Sam1 on Feb 3rd, 2009 at 2:00pm

Title: zero crossing
Post by Sam1 on Feb 3rd, 2009 at 2:00pm
speaking about crank/cam synch.
what is negative zero crossing mean?
particularly, moving from "what side" going to "what side" of the zero line?

Title: Re: zero crossing
Post by Tom Roberts on Feb 3rd, 2009 at 3:28pm
Sam,

Think of it like negative trigger.  Crossing zero going from positive to negative.  Direction negative going.

Remember that zero volts on the screen may not be zero on the sensor if you are working with a floating ground sensor.  More on this in your Nerd Series CD set.   ;)

Title: Re: zero crossing
Post by Sam1 on Feb 3rd, 2009 at 4:25pm

Tom Roberts wrote on Feb 3rd, 2009 at 3:28pm:
Sam,

Think of it like negative trigger.  Crossing zero going from positive to negative.  Direction negative going.

Remember that zero volts on the screen may not be zero on the sensor if you are working with a floating ground sensor.  More on this in your Nerd Series CD set.   ;)

Thanks Tom, that CD1 is GOOD, the guy there must be a Nerd. :)

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