I really have no idea what was going on but it sure looked weird to me. The other guy did "something" and then it worked. If the scope was showing the derivative I guess that would make sense, but if the rise time for the analog output of the 7i77 is a whole millisecond, that seems surprisingly bad to me considering it is being commanded by the square wave output of Siggen.
I have him using the probes set to 10x, and he supposedly calibrated them. Would it be better if the probes were set to 1x? These are relatively slow signals we're looking at, only 100Hz square waves. Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: andy pugh <[email protected]> Sent: Tuesday, August 16, 2022 8:39 PM To: Enhanced Machine Controller (EMC) <[email protected]> Subject: Re: [Emc-users] Siggen Issues [EXTERNAL EMAIL] Be sure links are safe. On Tue, 16 Aug 2022 at 19:45, Todd Zuercher <[email protected]> wrote: > I'm trying to use Siggen to generate a square wave form and output it to the > analog output of a Mesa 7i77. This is for tuning the current loop on a servo > drive. I set up a simple config to do this, but with the oscilloscope hooked > up to the analog output of the 7i77, what we are seeing is not quite the > square wave I was expecting. With the Siggen set for a 100hz signal we are > seeing +1v for about 1ms then 0v for about 4ms then -1v for 1ms then 0v for > 4ms, It isn't quite the square wave I was shooting for. Where did I go > wrong? What does Halscope think that the output is? Is the Oscilloscope set up as AC-coupled or DC? Bsically it sounds like the scope is displaying the derivative of the square wave, which could be coupling or possibly the probes? -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." - George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list [email protected] https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctoddz%40pgrahamdunn.com%7Cb5bff9e9fee744a1b54108da7fe90a53%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637962936123477964%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2yFC1mzmig5Aw3Z9FGC7UgsAKUfOsjsGLNdQ%2FW5t6X0%3D&reserved=0 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
