Time-loop at 1 MHz

Hello everybody,

after searching for something already post on the subject, I found a lot of interesting information but none directly that can answer my issue.

I have LabView with Real-Time extension.

Until now, I succeded to make a time-loop at 1 kHz, but in the timer, the 1MHz option is in grey, so I can't choose it, even with the real-time module.

Questions :

- I heared that MS windows is limited to approtimatly 55 ms of accuracy. Is it true ? I don't really understand because in that case, why NI made a 1 MHz if it is not possible for MS windows to do it ?

- Secondly, how can I make the 1 MHz timer for my time-loop ? Is there any process to do with real-time module to do that ?

Thanks in advance for your help.

Vivien