I'm trying to help this poor guy on the forum and ran into an odd stumbling 
block.

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?

Yellow trace in this image is the analog output from the 7i77.
https://forum.linuxcnc.org/media/kunena/attachments/21712/DS1Z_QuickPrint1.png

and the hal file is here:
https://forum.linuxcnc.org/12-milling/44454-set-up-using-amc-ab15a100-drives-brushed-dc-motor-prototrak-plus-with-encoders?start=270#249794


Todd Zuercher
P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
630 Henry Street
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031


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