Malcolm
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Posts posted by Malcolm
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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!
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Hi @attila
Thanks for the explanation!
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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!
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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!
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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.
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Hi @attila
Thanks for the information and detailed analysis! I will try and implement AD2 to my set up and hope it works.
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.
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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!
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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!
AD2 Network analyser
in Test and Measurement
Posted
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 :)