mesurer à partir d'un changement de tension

[axa-stenman]

Bonjour,

Je suis e train de créer un programme de mesure de tension sous Labview 2011 avec un module Ni9219.

Je voudrais pouvoir mesurer ma tension en continue et enregistrer toutes modifications de tension de 0.01v avec le temps au bout duquel la tension a chutée.

Je ne peux piloter mes mesures que avec une fréquence de temps. Je n'arrive pas à passer d'une fréquence de temps a une fréquence de tension.

Merci de votre réponse

Cordialement

[ThiCop]

Hello axa-stenman,

Just to make sure i'm understanding you right:

You want to measure your voltage levels continuously and only log when the voltage changes with 0.01 V (or more).

Are you measuring voltage drops of ad DC voltage? 

In which chassis are you using the NI 9219? How fast do you need to sample? What is your analog input range?

Which VI's are you currently using?

[axa-stenman]

Hello,

Yes, I want to measure your voltage levels continuously and only log when the voltage changes with 0.01 V (or more).

I measure the voltage drop of a DC voltage in a Ni cDAQ-9171 and Ni cDAQ-9174.

I want to do 1 sample with a frequence of 10Hz. And the input range is between -10V to 10V DC.

Now i using a VI's with DAQ-mx task with a Express exit write measure in Labview 2011.

But i have seen another way. Is to using a E/S node in Labview FPGA but i don't know how to use this system and where it is.

Kind regards.

[ThiCop]

Hello Axa-stenman,

Using FPGA I/O nodes requires and FPGA.

In the cRIO platform you have an FPGA, but not in the cDAQ-platform.

Is the voltage drop compared to the first value you ever read or to a theoretically set one?

Or is compared to the value you have read 0.1s before.

Do you already have some code available?

Then I can adapt this to behave the way you want it to.

[axa-stenman]

Hello,

I want compared to the value i have read 0.1s before.

I have no already available code, just this code to modify or somthing like that.

[ThiCop]

Hello,

I have tried to keep the code as closely as possible to the original.

Is this what you had in mind?

[axa-stenman]

Hello,

I have a problem with the Vi's. I can't download the file. I have a message "Le fichier ne peux pas être téléchargé. Le site n'a pas pu être trouvé ou n'es pas bon. Veuillez réessayer ultérieurement"

Perhaps can you send me the file in a mail.

Thanks

[ThiCop]

Here's another try.

There were soms issues with the server, so here's a second try.

[ThiCop]

There were soms issues with the server, so here's a second try.

[axa-stenman]

Thanks,

My problem is solved.

Best regards.