Generate high precision frame

[Programmer_]

Hello to the community

I need help please for a new project to find a NI card

I need to generate frames with a period of 600us ± 1us (ie 1666.67Hz ± 2.7Hz)

I was thinking about a PCIe-6323

Problem is: counter accuracy is 50ppm of Base clock (100kHz) = 5Hz

Same for all the others boards I find, accuracy is 50ppm of a 100kHz Base clock...

Would you have any idea of material for this application ?

Cédric

[Kevin_Price · Accepted solution]

You're already fine.  Your error calc of 5 Hz does not apply univerally, it applies only to a 100 kHz signal.  The error is always proportional to the nominal, hence the ppm designation.

In your case, you need to be within 1 microsec out of 600.  1 part per 600 corresponds to 1667 ppm.   Your counters are *much* better than that.

So like I said, you're fine with the 6323 you've already got.

-Kevin P

[Programmer_]

Ok I understand

The board must take the 100kHz and divide it by 60 (100kHz/60=1666.67Hz)

So the error 100.000 * 50/1.000.000 = 5Hz -> this number also has to be divided by 60

Thank you