Jump to content

Malcolm

Members
  • Posts

    9
  • Joined

  • Last visited

Malcolm's Achievements

Newbie

Newbie (1/4)

0

Reputation

  1. Hi @attila, Sorry, regarding my question I meant to say Network analyser instead of spectrum analyser. So is there a VI for network analyser and if not, the scripting done in Waveform can control things such as min periods, average, averaging in network analyser? For the Bode Vi, the issue was I cannot change the wavegen output amplitude to less than 3V and it works fine for above 3V. Thank you for your time @attila, you have been a great help :)
  2. Hi @attila sorry for bothering you (or any expert), I posted this question on the labview section of the forum (https://forum.digilentinc.com/topic/22764-labview-for-ad2-spectrum-analyser/)but it seems like that forum is dead already. So I redirect my question to this forum. The question is: I wanted to control spectrum analyser of AD2 using labview, but it seems like there is no vi for it, hence I used bode analyser vi. I was wondering from the bode analyser labview, how/is there a way for me to control all the controls that is shown in the image attached? Also, I encounter a problem in which when I change the amplitude lower than 3V for the bode analyser vi, it will hang. Is there something wrong that I did? The reason why I want to control the spectrum analyser is because I want 'for a step increase in W2, a fast frequency sweep (using W1) is done to get the phase difference between scope 1 and 2, which setting the values for min periods etc will allow me to get a more accurate reading. And for each sweep, I want to export the data to excel. Is there a way to do this via labview/python or any other ways to automate this process? Thanks! Digilent_WaveForms_Bode Analyzer (FGEN and MSO).vi
  3. Hi experts, I wanted to control spectrum analyser of AD2 using labview, but it seems like there is no vi for it, hence I used bode analyser. I was wondering from the bode analyser labview, how/is there a way for me to control all the controls that is shown in this image? Also, I encounter a problem in which when I change the amplitude lower than 3V for the bode analyser vi, it will hang. Is there something wrong that I did? The reason why I want to control the spectrum analyser is because I want 'for a step increase in W2, a fast frequency sweep (using W1) is done to get the phase difference between scope 1 and 2, which setting the values for min periods etc will allow me to get a more accurate reading. And for each sweep, I want to export the data to excel. Is there a way to do this via labview/python or any other ways to automate this process? Thanks! Digilent_WaveForms_Bode Analyzer (FGEN and MSO).vi
  4. Hi @attila Sorry for my lack of understanding, but I still do not get what is the function for them. E.g. If I put average as 10, averaging as 50ms and min periods as 32, does it mean that it captures 32 sine periods 10 times for a timing of 50ms and average them out? Thanks!
  5. Hi @attila and @Robin Oswald, Thanks for the help, I am now able to get the phase information that I wanted from the DUT :) @attila May I know what exactly does the average and averaging do for AD2? As I understand the Min periods function has already helped in averaging the results by the amount of cycle.
  6. Hi @attila Thanks for the information and detailed analysis! I will try and implement AD2 to my set up and hope it works. Hi @Robin Oswald Saw your post on coherence averaging and it allowed me to learn a new topic! Thanks to you and @attila , I may try out the beta version for my experiment. Thanks for your suggestion, yes I was thinking of using a pre-amplifier, although I am hoping to not add it in first as the accuracy of my experiment relies on an accurate phase information, hence I will try to minimise any components that may add phase noise or too much phase shift. But will add it in when signal is deemed to weak :D. Once again thank you both for the help and input.
  7. Hi @attila Thanks for the clarification! Looking at the related post I do see coherent averaging does improve the accuracy especially when there is huge noise of the same frequency interfering the signal. But this leads me to a question of which case should I use which averaging or is it in all cases the coherent averaging is better? In your reply to my question, you showed a very small signal with noise may I know how you created that signal in AD2 and what is the SNR of that signal? It seems that with that small signal it is still able to get a decent bode plot which increase my confidence in measuring the phase of my signal example. Lastly, may I ask what is the maximum current output when using network/wavegen as I see in documents it is 10mA and it says it varies. Does using the 5V auxiliary power supply increases its output current? Thanks alot for your time!
  8. Dear experts, May I know how the AD2 waveform 15 calculates the phase difference in the bode plot of network analyser? And how does the averaging/average function works? Does it help decrease my signal noise or is there anyway/functions to have a more accurate phase difference reading? I attached a picture, and I would like to ask if the AD2 is able to capture the phase difference between this 2 signal or is it too noisy? Thanks a lot for reading!
×
×
  • Create New...