as a test to see how people like it, I changed the .SMOO param on the Wind Speed monitor channels. This does some moving averaging in the server so the traces are easier to read.
This will be reverted on the next reboot, but also can be done at command line by setting the SMOO field to zero. At the moment it is 0.9. See attached plot: left side is quantized and no smoothing.
The CS channel seems to ignore its SMOO, but probably there's a way to get it to SMOO too.
The CS channel comes from Beckhoff. The other channels will eventually migrate to Beckhoff as well. Smoothing for the channels in Beckhoff may have to be done in the PLC code.
Rana, Patrick,
Can you please include your best guess as to what sort of filtering is applied by the 0.9 SMOOer? In particular at the 30 mHz to 300 mHz range? One of the open questions for the wind fence is how much turbulence is added by going over the edge of the building, and so we try to compare the free-stream spectra with the building top spectra, so additional filtering in this band is good to understand.
Thanks
-Brian
Rana is likely using the existing SMOO field in the EPICS database to modify the conversion - see EPICS wiki, among other places. Smooth runs from 0 to 1, with 0 being not smoothing and 1 being 'infinite' smooth (i.e. no value changes). The formula in the documentation iseng units = (new eng units × (1 - smoothing)) + (old eng units × smoothing)To determine the frequency of smoothing, you'll have to check the sample rate that the measurement is made at (also in the EPICS database file).
Robert pointed out that putting in SMOO will make it hard to make historical comparisons, so I returned all the SMOO to zero tonight. We'd like to make new channels which have 0.95 SMOO, so that we can maintain the historical comparison and also have smoother channels. Anyone can help with new chan making?