Card NI DAQ for SinCos encoder?

We have a RON285 heidenhain encoder that uses signaliing 1Vpp for "infinite precision".  Essentially, it generates two differentials Sin / Cos signals angle and the phase between them allows you to achieve extreme precision for the angle of the encoder.    You must always send two signals with a comparator hysteresis to essentially convert the signal quadrature encoder and count the pulses.  Calculation of phase angle gives you the fractional precision.

(1) no matter who never used a capture card of data OR to read in the first tensions and make the calculations necessary to convert the singal SinCos until a high precision angle? If so, you are ready to share the code?

(2) make the SinCos--> Quadrature conversion on the card itself by splitting off the two singals SinCos in two other channels and specify these two channels is coded quadrature singals or do have external hardware do the comparator + hysteresis before it captures in the map?

P. S.

I just found this piece of hardware that does exactly what I described in #2 above, I get this same functionality using just the DAQ itself card?  http://www.motrona.com/SinCos.html

The pointed inline Heidenhain WHAT JB interpolator is exactly the kind of thing I used other suppliers.  Yes, you can introduce digital quadrature channels in a meter and other synchronization maps DAQ in a PXI chassis.   9 kHz in quadrature frequency is easily manipulated by the jury.

Setting the "pulses per rev' to 360000 and choosing degrees for units should cause the task to do the math for you, for example, when you call DAQmx Read values should already be adjusted to degrees.   Personally, I do always some reason check this scaling value to make sure that there is not a factor of 4 gap because of the differing terminology between encoder and DAQmx tasks sheets.

As to limit yourself to the Tween 20 x, I tend to agree.  If the Encoder error has been distributed randomly, I completely agree.  But because much of it is probably more systematic than at random, there is a * chance * as some other fractional resolution might be useful.  Probably a pretty small gain at best however.  Unless it's quite similar cost & time probably, I wouldn't bother to > 20 x.

-Kevin P

Tags: NI Hardware

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