Hi Bob,
On 12/03/14 19:26, Bob Stewart wrote:
Hi Magnus,
Thanks very much for this response! It will be very easy to add the
exponential averager to my code and do a comparison to the moving average. I
have no experience with PI/PID. I'll have to look over the literature I have
on them and relate that to what I'm controlling.
It should be mentioned that I'm more interested in the adventure than in just
copying someone else's code or formulae and pumping this out. I have an idea
of how I want to do this and...
The effect of additional filtering can be a little tricky to analyze
sometimes, but the exponential averager, the normal 1-pole low-pass
filter, is however well-understood when the cut-off frequency is well
above the normal PI-loop bandwith. K*4 seems to pop up in my head.
It's a hint which comes from experience of others as well as myself.
You can also look into the Stanford Research PRS-10 manual, which also
optionally have such a filter in it's PPS slaving mode.
Cheers,
Magnus
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