# divided time base

In the simultaneous measurement with AI and AO, I used SMU-6124, that supports the time base of 80 MHz clock.

I was told that I can use 80 M/n (integer) as a sampling in SMU-6124.

In order to obtain n is integer, I limited my settings for 2 to 5 common factors.

But, why the actual sampling frequency is different from the sampling frequency of entry, 1.6 MHz (n = 50).

Real rates are 1.67E + 6 (analog input) and 1.54E + 6 (analog output).

What is the problem for this problem?

Any other consideration in its sampling frequency?

labmaster.

Hi labmaster,.

0) meter tasks can use the time base of 80 MHz (20 MHz and 100 kHz are also available).  So the frequencies available, you can generate using the meter is 80 MHz/N, where N is an integer (between 4 and 2 ^ 32).  You are still limited to the average fracture, but you would work with a higher time base so you could reach the frequencies that you couldn't otherwise (for example 1.6 MHz).

(1) you can check the actual sampling frequency of the counter by using the following property node:

(2) you can run GOT it, AO and two counters at the same time in separate tasks - I'd start, AO and Ctr2 before Ctr1 so that all tasks starts at the same time.  If you started Ctr1 first, then the clock will then perform tasks would begin at different times (software-based) unless you use a trigger to start.

I'm glad to hear that this has been helpful to you, I hope all is well and good luck to you with your application!

-John

Tags: NI Software

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