Nor-5406 & nor-5112 frequency sweep

Hello

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

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Hello

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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    I can communicate successfully between the Solartron and the GPIB using Labview and the default template of GPIB.vi in Labview.Also using VISA OR interactive control allows me to communicate successfully.

    Communication via the GPIB.vi or the VISA allows me to read the first line/point of the data file created from the frequency of scanning on the Solartron.I can produce results of 1st line/tip of the frequency sweep in a txt file using the viReadtofile within interactive control of VISA. However I can't out all the points of the sweep in a txt only once file.

    If I scroll to the next point/line on the solartron, I can read that point by using the GPIB.vi and with VISA Interactive Control, write that in a txt file.

    However, as mentioned I can not all points of the sweep in a txt output file at the same time.

    Should be changed to read all of the points on the solartron VI. Can this be achieved easily? Is there solution VI for the extraction of all the points of the solartron data file?

    Thank you

    Hello

    It's old stuff was updated to version 8 so readable up to lv2010

    Maybe you like it.

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