On 9/18/2019 11:15 AM, Jon Elson wrote:
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.
I've never heard of anybody getting 16-bit resolution from a load cell
or strain gauge.
There are full-bridge strain gauges with additional adjustments to
balance the common mode noise down to the minimum, but still, 16 bits
is one part in 65,536, which is really tough for
any analog electronics. Most people say that anything better than 1
part in 10,000 is getting extreme. Anyway, strain gauges produce very
small signals, so a really good amplifier that cancels out all noises
is critical. Ambient RF that gets rectified in the amplifier inputs
will likely be the greatest problem.
Jon
If you need 16+ bits of resolution to see enough the changes to drive
your servos, your control design is likely incorrect.
Try and change your mechanics or sensing method so you have a more
significant signal, otherwise noise will drive your control loop/s crazy.
Strain gauges have their limits.
Dave
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