HP 8562A , acquisition, limite 600points

[patrouchka]

Bonjour,

j'utilise Labview 8.5 communicant par GPIB avec un analyseur de spectre HP8562A.

Mon problème est que lors d'une acquisition je suis limité à 600points, avez vous eu cette situation? Et si oui d'ou vient cette limite?

En admettant que nous pouvons pas eviter cette limite, je voudrais faire des sous bandes. Je m'explique:

Je fais mon acquisition de 90Mhz a 115Mhz (reparti sur 600points)  ,je voudrai faire des sous bandes de 5MHz (sur 600 points (90-95 , 95-100,100-105 ....). Et ajouter tout cela afin d'etre plus precis.

Actuellement j'affiche seulement un graph entre 90 et 115, et je ne sais pas comment faire pour repartir celui ci en sous bandes. Pouvez vous m'aider?

Merci
Patrice

[chat-relotte · Accepted solution]

Hi,

You are on the english part of the forum. So, you need to post in english here. Here is the link to the french discussion forum :

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Translation :

I am using LabVIEW 8.5 communicating by GPIB with a spectrum analyser HP8562A.

My problem is that when acquiring data I am limited to 600points, did someone already encountered this situation? If yes, where does this limit come from ?

If we can't avoid this limit, I would like to use sub bands. Explanation :

I am acquiring between 90MHz and 115MHz (with 600points), and I would like to use sub band of 5MHz (with 600points (90-95, 95-100, 100-105...). And add the whole thing to be more accurate.

Right now, I am only displaying one graph between 90 and 115, and I don't know how to split it into sub bands. Can someone help me?

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Now about your question, my guess is that the limit is coming from the way you are getting the data from your spectrum analyser. Are you directly using gpib VIs in LabVIEW or an already made driver?

I have found that the 600points limit is probably due to default value that you have to change or the format you are using : Have a look at this forum post.

For the sub bands, you have to acquire data from the differents 5MHz bands with the same parameters and then you should have a table of 600 points for each sub bands. Then you can concatenate the tables using the build array VI.

Hope this will help,