in any case, even with lower 16-bit precision, the most important part of the design is the analog portion that sits between the load cell and the A/D converter.
On Wed, Sep 18, 2019 at 6:38 AM Curtis Dutton <curtd...@gmail.com> wrote: > Chris thanks for the info. > > I'm not exactly certain at this point what precision I need. I'll be > determining that experimentally later. I will keep in mind what you have > said, I'll deal with it after I get my hardware running. > > > On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson <albertson.ch...@gmail.com > > > wrote: > > > If you want better than 16-bits and 1KHz then you also are going to need > a > > very good quality analog signal conditioning and instrumentation > amplifier. > > The analog circuit between the A/D converts and the load cell really > does > > matter. You have to reject common-mode or the low bits will just be > > filled with 60Hz noise. And you can not simply use a "brick wall" filter > > or you will not get the desired bandwidth through. (If you are needing > to > > sample at 1K then you must care about 500Hz bandwidth. > > > > This matters a LOT more than which A/D chip you use. > > > > 22 bits is better than one part per million. Do you really need that? It > > will be hard to isolate all of the electrical and mechanical noise > > especially > > > > On Tue, Sep 17, 2019 at 2:26 PM Curtis Dutton <curtd...@gmail.com> > wrote: > > > > > I have a pet project I'm starting that will involve reading a load cell > > in > > > as near as real time as possible and using that input for servo > control. > > > > > > I plan on using mesa hardware to interface to the equipment. Does > anyone > > > know of a nice way to interface hotsmot2 to a load cell? > > > > > > I would like a fairly high resolution. 16 bit minimum, the higher the > > > better up to 22 bit I suppose. As well as the ability to sample at the > > > servo thread rate of 1 Khz. > > > > > > > > > Thanks, > > > Curtis > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > -- > > > > Chris Albertson > > Redondo Beach, California > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
