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Messages - KevinRSA

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General Mach Discussion / Re: Am I loosing Steps, and what should I do
« on: August 05, 2016, 10:37:30 AM »
Hi Russ, I can't see from the video that there is any problem there(especially not one that would create a 1.4mm error). I would go with Jim's advise and pursue the electronic suspects.

Like I said in my mail to you, I would expect to see a reasonably clean square wave on the pulse output, Once we have established that the pulse output is indeed good I would be keen to see if reducing the steps/rev has any effect.

Kevin

This is the Pulse+ wave form from a Jamen controller

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General Mach Discussion / Re: Am I loosing Steps, and what should I do
« on: August 01, 2016, 02:26:11 AM »
 "Pulse + to scope A in and scope ground to pulse -"

This is not recommended as it could damage the line driver on the Jamen board, rather connect both channel 1 and 2 ground to ground and channel 1 to pulse plus and channel 2 to pulse -.
This will show the full differential output.

This link has some explanation on measuring differential signals.

http://electronics.stackexchange.com/questions/76514/how-do-i-measure-differential-signals-like-rs-485-or-dmx-on-an-oscilloscope

Kevin

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