Problème de graphe (temps relatif) - acquisition de données en temps réel.

[Madje55]

Bonjour à tous,

J'ai parcouru le forum mais je n'ai pas trouvé de réponse à cette question.

Voila je fais une acquisition de tension via le boitier NI USB 6008. Mon but est de tracer une courbe sur une certaine durée (1 heure voire plus).

Le problème que je rencontre se situe au niveau de l'axe des abscisses (temps). Je voudrais plutôt afficher la durée sur l'axe (temps relatif), plutôt qu'un format "heures : minutes" (temps absolu). Le souci c'est que quand je mets "temps relatif", j'ai des valeurs aberrantes sur mon graphe (du genre 5832696). J'ai cru comprendre que Labview comptait à partir du 1er Janvier 1904, mais je ne trouve pas l'endroit où modifier ce paramètre.

                                                                                      Cordialement, Madjé.

[muks]

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Translation

I went through the forum but I did not answer this question.

 I make a purchase via the voltage NI USB 6008. My goal is to draw a curve over a certain period (1 hour or more).

 

The problem I encounter is at the x-axis (time). I would rather see the time on the axis (relative time) rather than format "hours: minutes (absolute time). The concern is that when I put "on time", I outliers on my graph (the genus 5832696). I understand Labview counted from 1 January 1904 but I can not find where to change this setting.

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You can try the french board

[James_W]

Je suis Anglais,

Je pense je vous comprendes.

Je pense le problem est:

Daccord?

James

[James_W]

C'mon Muks, Thats half the fun. I was practising my (very rusty) language skills. Posting a translation before I posted makes it look Like I didn't work it out myself!!

[Madje55]

Hi,

I didn't see i posted in the english board, sorry.

Thanks for translating and answering. But i meant i don't want to use "absolute time" with my X axis, but just the duration of the acquisition (0 to 60 minutes for exemple).

I tried like you posted, but it still doesn't display correctly when i choose "relative time" in the properties.

:mansad:

Message Edité par Madje55 le 03-25-2010 07:30 AM

[JB]

Please post your VI or at least a screenshot of the graph properties.

[Madje55]

Of course. Here's my VI (Labview 8.2).

[muks]

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James W wrote:
C'mon Muks, Thats half the fun. I was practising my (very rusty) language skills. Posting a translation before I posted makes it look Like I didn't work it out myself!!

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[James_W]

Have you tried using a Waveform Chart instead of a Waveform Graph? They should always restart at 0 (I think)

(IDIOT)

Change the data type from Dynamic to Double, then you loose the time data

Message Edited by James W on 03-25-2010 12:56 PM

[Madje55]

I'm using a french version of Labview but it seems like i'm already using a waveform chart (Graphe déroulant).