XHC Motion Card, MK3-III

[Tom J]

Another issue...
My LG inverter gives ~12V signal not 10V like required so I used voltage regulator 78L10.
Now I have nice 10.1V but module output (AVI) is not linear, and I can get only 9.3V output.
I could compensate voltage input in spindle parameter so 9,3V would give me 400Hz.

I decided to use resistor or pot. in series to 10V input, now I can adjust voltage to get ~5v at 200Hz or ~10V at full 400hz
I should use voltage divider but inverter needs only 15mA so resistor is easier.
I use power 24V from motion card rather than from Spindle output - sound strange. Input in inverter still got 0V (CM) and signal from V1 from motion card (AVI).
All that gives me better result than those from table below.

I have set spindle speed (pulley menu) at min 6000 rpm, 100Hz, 2.5V voltage input and to max 24000 rpm 400Hz 10V input signal.
Table below shows how output voltage from card very from desired (this was before adjusting input voltage)


I deleted linearity.dat file from Macro file and still can not get nice linear output - any suggestion?

I start playing with 0-1000rpm, everything was ok - close (I mean voltage output wise)
I used different source of power than a spindle output 10V.

Does anybody use this card? seems to be popular for being usb type not LPT.