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added some comments on cal_*binary() functions

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Frank Mori Hess 2003-04-30 20:36:15 +00:00
parent c5a39df702
commit 464b43a015
1 changed files with 17 additions and 3 deletions
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comedi_calibrate/README
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@ -170,8 +170,22 @@ dof indicates that linear fitting should not be used.
The functions cal_binary() and cal_postgain_binary() are used when
the caldac dependence is highly non-linear. It does a binary search
in the range of the caldac to find a decent value. Once a decent
value is found, cal_fine() should be used, since the caldac dependence
should be relatively linear in a small range around that value.
in the range of the caldac to find a decent value.
Notes by fmhess******************************************************
I would use cal_binary() always, as opposed to cal1() or cal1_fine(),
since it is the best algorithm.
cal_relative_binary() is the same as cal_postgain_binary(). I prefer
the more general name because the function is useful for more than
just postgain offsets. It adjusts a caldac so the difference between
two observables is correct (although their absolute values may still
be offset), which works for postgain offsets, but
is also good for gain calibrations when the gain adjustment
couples with the offset.
cal_linearity_binary() was added for convenient calibration of
analog output linearity on NI boards. It should be fed 3
observables that are well separated from each other. It adjusts
a caldac so that the ratio (obs3 - obs2)/(obs2 - obs1) is
correct.