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EVM430-FR6047: Frequency Sweep Curve

Part Number: EVM430-FR6047

Hi,

I had downloaded the new USS DC app just recently and i found that the same transducer was showing different frequency sweep in two different versions of USS DC app.

 In USS 02.20.00.16,we get a peak at 1000 KHz and a drop at 1020 KHz

 while in USS 02.20.00.18 ,we get a peak at 1020-1030 KHz 

What could be the reason?

Best Regards,

Divya Harikumar

  • Hey Divya,

    We just ran a quick test here at our desks and the frequency sweep was consistent for both versions of the GUI and Library.

    Did you change anything else in the setup here? Were there changes in the pipe? Are both at zero flow when the pipe is full of water? Any changes in the GUI configuration?

    Besides the shapes of your sweeps, your second one has much higher peak amplitudes and is possibly oversaturating. You really want to keep the peak amplitude under 1000 max, so you may need to adjust the gain settings there as well.

    Thanks,
    JD
  • Hi JD,

    There were no changes in the pipe setting.

    Does adjusting gain affect the frequency sweep?

    There seem to be no other change in GUI configuration.

    Best Regards,

    Divya Harikumar

  • Hello Divya,

    Yes.  My understanding is that any change in configuration and settings can change the frequency response.  It's possible it's more pronounced in your case due to possible saturation. 

    Other factors can also change frequency responses to like temperature, etc.  

    Can you turn the gain back to the same as previous?  Do the frequency responses now look the same? 

    Do you have the last version of GUI/Library to compare against on your side?  They should both return the same information if you test back to back.   

    Thanks,

    JD

  • Hey Divya,

    Were you able to test both versions and compare the sweeps with the same settings back to back and confirm no differences?  

    I'll be traveling for the next 10 days, so my responses will be delayed.  I'm going to close this thread for now, but feel free to respond and I will review further when I return.

    Thanks,

    JD

  • JD,

    Sorry for the delay in response.

    All settings are default in both version and they look similar too except for the point where i obtain peak amplitude.

    Older version of USS(figure 1) has a peak somewhere around 995-1000khz while newer version(figure 2) seems to have a peak around 985kHz

                                                                                                     Figure 2                               

    Best regards,

    Divya Harikumar

  • Hey Divya,

    Thanks for running the test.  They also look very very similar to me.  

    I'm going to go ahead and close this thread, but I'll send this to a fellow TIer who works very closely with this to review, but it looks just as expected to me.  If he sees anything worth discussing further, I'll let you know. 

    Thanks!

    JD  

  • Divya,

    I would like to look into this difference you are seeing.  Are you using the same version of firmware in both test cases?  What version of firmware are you running?  I want to see if I can reproduce this effect first.

    Is it possible that you have air bubbles in your pipe?  I have not seen the types of inconsistencies that you are seeing.  Can you provide a picture of your pipe and setup?  Maybe try changing the orientation of the pipe to ensure that any air bubbles are not seen by the transducers.

  • Eddie,

    We were using different firmware for both cases.

    For figure 1, firmware version was 2_20_00_4 and USS 02_20_00_16 while for figure 2 ,firmware version was 2_20_00_8 and USS 02_20_00_18.

    No changes in GUI parameters

    Best regards,

    Divya Harikumar

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