Nor-5406 & nor-5112 frequency sweep


I have a frequency generator (5406) that I use to generate a frequency sweep (1 ms by frequency).

When I read the signal with a digitizer (5112) it seems that the duration at each frequency is bad.

I've attached a photo (I hope) to identify the problem.

The sinus begins here, at a frequency of 20 kHz to 1710 (coordinates, left panel).

Because I taste 3 MHz and that each stage of the frequency is 1 ms, I expect to see the next step to 4710.

That is not the case (right panel)

Any help appreciated

Also attached to this message is a copy of a part of the block diagram.

Thank you



The explanation of what you see, is that even if you ar affecting your sample NOR-5112 3 ms/s, you are actually sampling at 3.03MS / s.

If you are referring to the specs of the device , you will notice that this Council has a maximum rate of 100MS/s of sampling and can sample at a rate decimated 100MS/s/n where n is an integer between 1 and 100e6.  If the sampling frequency is not feasible by the digitizer, the pilot will force the value of the next achievable sampling frequency that is higher than what you asked.  In this case n = 33 and your actual sampling rate is 3.03MS / s.

If by your calculation for 1ms, you will get 3000 samples at the rate of sampling or 3 ms/s.  This would pass to 3030 samples at a rate of 3.03MS / s.  I think that this corresponds to what you see on the image.  To be certain of the current rate of your Board is sampling, try to use VI "niScope sampling rate" to query the actual sampling frequency of your digitizer.

-Jennifer O.

Tags: NI Products

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