7i76E + THCad 10V

According to the manual^

"THCAD outputs a 1 MHz reference frequency that is synchronous with the
output pulse train. This may be used as a frequency counters gate reference source. The
advantage of using the THCADs reference frequency as a gate source rather than a local
crystal clock is that it is synchronous with THCADs frequency output and therefore
eliminates the +- 1 count uncertainty that comes from using a asynchronous gate."

Is it possible to use this FREF signal with the 7i76e board?

regards,
Oleg

No, its not possible currently

Right at the moment I have no clue why my system appeared in bipolar mode, and I see luck of information from the manual to put right parameters to config.

According to manual
"Measured input voltage can be calculated from the THCADs output frequency
using the following formula:
V= VFS * (FOUT - FZERO) / (FFS - FZERO)
Where FOUT is the output frequency of the THCAD, VFS is the unipolar full scale
range 10V or 300V or custom value determined by external resistors.
FFS is the full scale
output frequency on the calibration sticker, and FZERO is the 0V input output frequency
on the calibration sticker."

So I have the calibration data on my card, and FZERO for unipolar mode is 120000, FFS =926100 and VFS=10
How can I convert these parameters to bipolar mode?

Oleg

Not sure why you would you want to
Plasma systems will always be unipolar so W1 should be down and the unipolar settings are correct
(if you run in /32 mode, divide the FZERO and FFS by 32)

And how to convert these constants if board running bipolar mode? There are no info for this mode in the documentation...

You can take FZERO and add 1/2 of FFS for bipolar mode FZERO

But if this is being used for a plasma height control you dont use bipolar mode at all