Sampling rate of 5133

[alex.]

I read the manual and get as below, it seems the sampling rate varies continously. But normally the sampling rate varies discontinously as step by step.

Any suggestion?

Internal sample clock frequency ........

100 MS/s
(USB-5133) sampling rate with
decimation by n, 1 < n < 65,535

[KateB]

Since you don't explain your problem clearly, I guess you wish to know available sampling rate of 5133.

Well, its maximum is 100 MS/s, and you can divide it by integer to get a lower sampling rate down to 1.526 kS/s which is 65536 division.

[alex.]

If this is really true, does that means the config of the data length of collection may not be very accurate.

[KateB]

Why do you think it's going to be in accurate?

Could you please share your idea in detail so that I can explain to you?

[alex.]

I need to config the exactly the wave length for data processing and storage.

Such as each wave 100 points or points.

[KateB]

Then, just configure Record Length to 1000 points.

I don't see anything concern with sampling rate.

[alex.]

The sampling time period is fixed, when user change the sampling rate, I need to know the exact number of sampling points.

[KateB]

Then, you can divide sampling period by actual sample rate property of niScope to find out what is an actual record length you should have.

[John_P1]

Hi Everybody,

Thanks for the suggestions Kate!  You can also read back the Actual record size directly through the niScope API--in LabVIEW it can be done with an niScope Property Node:

If you were looking for something else don't hesitate to let us know.  I hope this helps.

-John

Message Edited by John P on 12-01-2009 07:25 PM