Acquisition donnée potentiostat

Bonjour,
Je souhaite réaliser un monte avec un potentiostat pour acquérir les données de celui ci, je pense qu'il faut que je récupère les signaux Y+ Y- et X+ X- mais je ne sais pas trop comment m'en servir derrière, mise a part qu'il faut que je les mettent sur un convertisseur USB 6210 qui est relie au PC.
De cette façon je peux récupère mes courbes sur LABVIEW.
Mais je ne sais pas comment brancher les sorties Y et X du potentiostat ? Ni ce qu'il en sort.
Merci d’avance

La solution, si vous aviez une carte un peu plus performante permettant le déclenchement analogique, serait justement de configurer un déclenchement analogique sur un certain seuil pour démarrer l'acquisition uniquement lorsque vous avez appuyé sur le bouton du potentiostat.
AInsi, avec l'USB-6210, cela n'est pas possible. En revanche, le déclenchement numérique est possible. Avez vous donc la possibilité de ressortir un ligne numérique de votre instrument qui changerait d'état lors du démarrage du potentiostat?
Cordialement
David S.| Certified LabVIEW Associate Developer
National Instruments France
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Erreur de VISA read et bug d'affichage pour acquisition données via balance mettler

Bonjour,
Je dois faire une acquisition de données depuis une balance mettler, j'ai fais mon programme qui marche bien, sauf 2 choses:
1) J'ai une erreur dans un VISA read que je ne comprend pas. Le message de l'erreur est le suivant:
L'erreur -1073807343 s'est produite à : Nœud de propriété (arg 1) dans VISA Configure Serial Port (Instr).vi->programme balance-5.vi
Raisons possibles :
VISA: (Hex 0xBFFF0011) Les informations concernant la position sont insuffisantes ou bien soit le périphérique soit la ressource n'est pas présent dans le système.
Raisons possibles :
VISA: (Hex 0xBFFF0011) Les informations concernant la position sont insuffisantes ou bien soit le périphérique soit la ressource n'est pas présent dans le système.
2) Je souhaite afficher l'identifiant de la balance ainsi que la mesure en continue du poids, tout cela dans deux indicateur différents. Tout marche bien sauf quand j'actionne certains boutons, que j'ai fait comme le zero de la balance, l'affichage du l'Id de la balance se fait dans l'indicateur de la mesure du poids et inversement.
Malheureusement je débute en LabView et ne suis pas habitué à la programmation graphique, donc je suis un peu nul pour détecter les erreurs dans un code.
Si quelqu'un peut m'aider ce serait super et je met mon programme en pièce jointe (désolé si le code est pas d'une propreté maximal, mais j'ai vraiment pas l'habitude de coder en programmation G)
Merci
Salutations
Pièces jointes :
programme balance-5.vi ‏62 KB

Bonjour,
Voici la discussion traitant de ce type d'erreur : erreur -1073807343 dans visa open
Cordialement,
Steve M.
National Instruments France
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>> Vidéo-t'chats de l'été : présentations techniques et ingénieurs pour répondre à vos questions

Démarrer acquisition données sur horloge

Bonjour,
Je désire effectuer des tests sur un capteur angulaire ayant une sortie série simple, 14bits de données exclusivement (aucun bit de parité ou autre...). Le capteur est conçu de manière à envoyer les données selon une horloge externe qui a à un moment un état haut 2fois plus long, ce qui donne le top.
Je n'arrive pas à faire l'acquisition de mes données ainsi.
J'ai essayé d'utiliser le DAQmx horloge d'échantillonnage mais ca ne fonctionne pas, un message d'erreur m'indique que les lignes utilisées ne supportent pas les actions bufferisé.
Je travail sous LabView 8.2 et je fait l'acquisition grâce à une PCI 6250.
Merci d'avance pour votre aide.

Bonjour.
Il vous sera impossible dans votre cas de vous servir de ce signal externe comme de l'horloge de la carte puisque l'échantillonnage se fera à chaque front et ne tiendra pas compte du fait que l'état haut a duré 2 fois plus longtemps.
Je vous conseillerais peut être de faire l'acquisition simultanément avec la 6250 de votre signal externe ainsi que du signal issu du capteur, puis logiciellement ou en post-traitement, d'éliminer les points qui ne vous intéressent pas.
Cordialement.

Mpgs in acquisition don't work

hi i just downloaded acquisition, and whenever i download mp3's they work fine, but whenever i download any videos and try to open them in quicktime, it always gives me a message saying that it's a file format that quicktime doesn't understand....am i missing something here?

There's more than one mpeg format, but this should make/allow QT to show them...
http://www.3ivx.com/download/macos.html
There are many QT Plug-ins...
http://www.google.com/search?hl=en&client=safari&rls=en&q=osxquicktimeplugins&btnG=Search

Acquisition données analogiques par SCB 68

Bonjour, Stéphane stagiaire chez EADS.
Je dois mettre en place une chaîne d'étalonnage de capteurs par le biais de Labview.
Pour cela, je dois acquérir deux signaux provenant d'un capteur à étalonner et d'un capteur étalon puis les comparer.
J'ai une carte d'acquisition Ni (SCB 68) et j'ai essayé de visualiser mes deux signaux.
Problème: je n'arrive pas à visualiser ces signaux.
L'exécution du prog m'indique une erreur 10403 (le périphérique est reconnu mais le programme n'est pas adapté à la mesure).
D'où peut provenir cette erreur?
Erreur au niveau du programme ou bien périphérique mal installé?
Dans l'attente de votre réponse,
cordialement,
Stéphane THIERRY.

Monsieur,
Quelle carte utilisez-vous? Quelle est votre version de driver?
Le SCB-68 est le boîtier de connection pour acquérir vos signaux. Vous trouverez le type de votre carte dans Measurement & Automation Explorer, sous l'arborescence "Périphériques & Interfaces".
De plus, quel type de mesure faîtes-vous avec votre carte ? Quelles fonction utilisez-vous pour faire l'acquisition de vos signaux ?
Avez-vous essayer d'exéctuer un exemple fourni avec LabVIEW ? Si oui, fonctionne-t-il? Les exemples se trouvent dans Aide >> Recherche d'exemples... >> E/S matérielles.
Sincères salutations
Isabelle Jean
Ingénieur d'application
National Instrument
Isabelle
Ingénieur d'applications
National Instruments France

Report S_ALR_87012050 - Asset Acquisitions

Hello,
The report S_ALR_87012050 - Asset Acquisitions is bringing only information from the "current year" acquisition - Tty 336, and it's not bringing information from the "prior year" - Tty 331.
Is it a customizing in the report to change it, or is it default by SAP?
Comparing to the report S_ALR_87011990 - Asset History Sheet, the values from the acquisition don't match because of this difference.
Thanks,
Barbara

Hi Barbara,
In our system we don't have ttype 331 and 336.
Have a look in SPRO what Transaction type grp you are using (31 or 33 should be in)
Financial Accounting / Asset Accounting / Transactions / Transfers / Define Transaction Types for Transfers.

BAPI_ACC_DOCUMENT_POST how to post a document relate with assets

Hello all,
I'm using this BAPI to replicate the financial accounting flow. I've achieved to post almost of document types but asset documents. I've got the following error:
"Account 'Contra account: Acquisition value' could not be found for area 01"
For example i'm trying with a document like this:
U100 1 70 17000000 000002000000 0000 1,000.00 USD
U100 2 31 00403201 adasdasdad 1,000.00- USD
I don't have any trouble when posting from FB01, but when i try to post the document across this BAPI i got the previous error. I'm pretty sure that the problem is because the bapi (i don't know what i'm doing wrong) is trying to retrieve the contra account: acquisition value), this account is not customized (because is not necessary for our requirements). When i post from FB01 the acount retrieved is: Acquisition:Acquis. and production costs.
Has anybody tried to post an assets document with this BAPI?
Thank you very much!

Hello
Offsetting Account Number
In this field the R/3 System determines the offsetting account for the
item, as long as the account is maintained in the corresponding account
assignment.
It's a clearing account or another name used in this connection is
contra account. The defintion for the contra account is:
The contra account is for an asset acquisition posting, provided
the posting was not an integrated posting with Financial Accounting.
Another example is the offsetting account for revaluation:
Reconciliation account for appreciation to the acquisition and
production costs of assets.
Information:
the offsetting account is triggered in ABZON
for the depreciation areas that post to GL in real time.
Also, any acquisition done by ABZON gets updated to all ledgers
within the same ledger group.
Unfortunately you cannot limit the posting of the APC to some
ledgers only.
If you put an offsetting account in ABZON, system will post the
acquisition to the leading and the non-leading ledgers too: the
problem is that it will post into the countra account defined for the
area 01 (leading ledger) because it is the only one that post to GL in
real time.
The other area will get the posting to the other account because it is
not in real time the posting.
Hope this helps
Ray

Help please: DAQWare or data logging software (multichannel data capture) questions

I am writing regarding DAQWare, data logging software, and the PC-LPM-16
board, which a group of us a trying to come to grips with. This is rather
lengthy, I'm afraid...
We are a group of college students in a computer programmer/analyst
program. We have a course that involves doing a project to go through the
software development lifecycle (or as much of it as can be done in a term).
For our project we teamed up with a group in the industrial hygiene
program; they have a computer (standalone) with a PC-LPM-16 (PnP) DAQ board
and the NI-DAQ software (all of this has been around for a few years, but
has not been used much), and our goal was to capture the data they are
measuring (atmospheric pollutants) to an Microsoft Access database.
We are not familiar with DAQ systems, but were shown the software they had
installed. This included DAQWare (appears to be version 2.0). We thought
we could use DAQWare to log data to a text file, which we then would import
into the Access database. We came up with VBA code to parse the ASCII text
file created, but have run into one problem: DAQWare does not timestamp
each sample, but only puts a single timestamp in the header information.
Now we could extrapolate the time for each line based on the sample rate,
except that sometimes it seems to put in 8 values per sample, sometimes 12
values. For instance, in the sample of a text file below, the capture was
run for 1 minute at a sample rate of 60, and there were 480 measurements in
the file, or 8 lines of measurements per sample. (At a sample rate of 100,
we got 800 measurements in the file etc.) This was two weeks ago. Today,
we returned to capture more data, and DAQWare was logging 12 measurements
per sample (so at a sample rate of 100, we ended up with 1200 lines of
measurements). We do not know where this factor of 8 or 12 is coming from
or how it got changed in the two weeks between captures. We would like to
be able to have them just run DAQWare, for days on end if they wanted,
capture the data to file, then use our code to parse the text file into the
database, but if we cannot put timestamps on the readings, there seems no
point.
*** Example of a capture below... ***
DAQWare File
Version: 2.0
Number of Lines in Header: 10
Comment:
Date: 10-18-1999 Time: 10:01:39
Sample Rate: 60.0
Scan Rate: 0.0
File Format: 1
Samples per Channel: 480.0
Number of Channels: 5
O3 SO2 NOX NO2 NO
4 3 2 1 0
1 1 1 1 1
0.537 0.276 0.259 -0.017 0.015
0.537 0.273 0.261 -0.022 0.012
0.537 0.276 0.259 -0.037 0.012
0.537 0.276 0.264 -0.007 0.015
*** and so on... ***
Regarding this attempt to use DAQWare:
1. Can you tell us where this factor (8 or 12 or however many more readings
than we would expect) means, where it is read from or set?
2. Is there an updated version of DAQWare that we should download that
would be better?
3. Is there some other existing software that we can download to use to
perform basic logging of multichannel analog input to a text file (with
timestamp)?
I realise that the software comes with tools (DLL functions) that one can
use to create custom software to interface with the DAQ board, but in the
limited amount of time we have we are not sure we can learn enough about
these functions to write our own datalogging software.
However, to see if I could grasp the basics, I have looked through the
examples for Visual Basic and think that a program would run something like
this:
1. at the beginning, use LPM16_Calibrate to reset the board
2. configure acquisition with DAQ_Config
3. start acquisition with Lab_ISCAN_Start
4. loop to check is acquisition done with Lab_ISCAN_Check
5. once sampling done, write data out to file
6. loop back up to 3 to get next lot of samples
Unfortunately, a sample app using Access and VBA I created came back with
an error telling me it could not find nidaq.dll (even though this is in the
Windows system directory); probably it is not a good idea to try to do this
in Access in the first place. I am going to have a go using Delphi, which
I know a bit better.
One thing I am unsure of is what the numbers will be coming out of
Lab_ISCAN; the reference file seems to indicate they will be binary
readings, not voltages, and I wonder how to correlate these with instrument
measurements (the instrumentation people we going to set it up so that
1mV=1ppm).
Any help you can give to point us in the right direction would be
appreciated.
Sincerely, Marc Bell ([email protected])

I am writing regarding DAQWare, data logging software, and the PC-LPM-16
board, which a group of us a trying to come to grips with. This is rather
lengthy, I'm afraid...
We are a group of college students in a computer programmer/analyst
program. We have a course that involves doing a project to go through the
software development lifecycle (or as much of it as can be done in a term).
For our project we teamed up with a group in the industrial hygiene
program; they have a computer (standalone) with a PC-LPM-16 (PnP) DAQ board
and the NI-DAQ software (all of this has been around for a few years, but
has not been used much), and our goal was to capture the data they are
measuring (atmospheric pollutants) to an Microsoft Access database.
We are not familiar with DAQ systems, but were shown the software they had
installed. This included DAQWare (appears to be version 2.0). We thought
we could use DAQWare to log data to a text file, which we then would import
into the Access database. We came up with VBA code to parse the ASCII text
file created, but have run into one problem: DAQWare does not timestamp
each sample, but only puts a single timestamp in the header information.
Now we could extrapolate the time for each line based on the sample rate,
except that sometimes it seems to put in 8 values per sample, sometimes 12
values. For instance, in the sample of a text file below, the capture was
run for 1 minute at a sample rate of 60, and there were 480 measurements in
the file, or 8 lines of measurements per sample. (At a sample rate of 100,
we got 800 measurements in the file etc.) This was two weeks ago. Today,
we returned to capture more data, and DAQWare was logging 12 measurements
per sample (so at a sample rate of 100, we ended up with 1200 lines of
measurements). We do not know where this factor of 8 or 12 is coming from
or how it got changed in the two weeks between captures. We would like to
be able to have them just run DAQWare, for days on end if they wanted,
capture the data to file, then use our code to parse the text file into the
database, but if we cannot put timestamps on the readings, there seems no
point.
*** Example of a capture below... ***
DAQWare File
Version: 2.0
Number of Lines in Header: 10
Comment:
Date: 10-18-1999 Time: 10:01:39
Sample Rate: 60.0
Scan Rate: 0.0
File Format: 1
Samples per Channel: 480.0
Number of Channels: 5
O3 SO2 NOX NO2 NO
4 3 2 1 0
1 1 1 1 1
0.537 0.276 0.259 -0.017 0.015
0.537 0.273 0.261 -0.022 0.012
0.537 0.276 0.259 -0.037 0.012
0.537 0.276 0.264 -0.007 0.015
*** and so on... ***
Regarding this attempt to use DAQWare:
1. Can you tell us where this factor (8 or 12 or however many more readings
than we would expect) means, where it is read from or set?
2. Is there an updated version of DAQWare that we should download that
would be better?
3. Is there some other existing software that we can download to use to
perform basic logging of multichannel analog input to a text file (with
timestamp)?
I realise that the software comes with tools (DLL functions) that one can
use to create custom software to interface with the DAQ board, but in the
limited amount of time we have we are not sure we can learn enough about
these functions to write our own datalogging software.
However, to see if I could grasp the basics, I have looked through the
examples for Visual Basic and think that a program would run something like
this:
1. at the beginning, use LPM16_Calibrate to reset the board
2. configure acquisition with DAQ_Config
3. start acquisition with Lab_ISCAN_Start
4. loop to check is acquisition done with Lab_ISCAN_Check
5. once sampling done, write data out to file
6. loop back up to 3 to get next lot of samples
Unfortunately, a sample app using Access and VBA I created came back with
an error telling me it could not find nidaq.dll (even though this is in the
Windows system directory); probably it is not a good idea to try to do this
in Access in the first place. I am going to have a go using Delphi, which
I know a bit better.
One thing I am unsure of is what the numbers will be coming out of
Lab_ISCAN; the reference file seems to indicate they will be binary
readings, not voltages, and I wonder how to correlate these with instrument
measurements (the instrumentation people we going to set it up so that
1mV=1ppm).
Any help you can give to point us in the right direction would be
appreciated.
Sincerely, Marc Bell ([email protected])

I am sampling a signal at 1kHz for every 1 second. How do i average the signal for N seconds?

I am sampling a signal at 1kHz for 1 second. After one second of pause, i sample again for 1 second at 1kHz. If i do this for Nth time, how do i average the signal over the 1 second period?

Anyway you need to have the data to compute the average... and usually you don't get the data point-by-point unless it is very low frequency acquisition.
If it is the case, you have to update your 2D vector point by point and then compute the average after each new point (much slower process indeed). You keep say 20 vectors of data and fill in the data (1, 2...20) and then( 1,2..20), so you compute the average on the last 20 acquisitions
(don't forget the rating)
Doc-Doc
http://www.machinevision.ch
http://visionindustrielle.ch
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Perform INIT, DELTA, and FULL Load from R3 to BI 7.0

Hi,
Could anyone please give me the information about how to perform the following to load data from the R3 system to the BI 7.0 system:
1. INIT Load
2. Delta Load
3. Full Load
4. RealTime Data Acquisition
Where can I find the settings for all the above in DTP?
For Real Time Data Acquisition; Don't I have to load the data from the data soruce to the PSA........
Does the data goes directly from the data source to the data target throguh Daemon Process? I read the SAP Help doc's but still little confused.......could any one please explain it in your clear way.
Thank, I will assign the points.

the first three are similar to 3.5
check out this blog by KJ for RDA
Real-Time Data Acquisition -BI@2004s

CW demo PID pour suppression de Following error

Bonjour,
J'ai déjà écrit dans ce forum, concernant un problème de retour chariot sur une table 1 axe de chez Schneeberger avec une application Labview 6.1 nécessitant une carte PCI 6035E (acquisition données), et une Multiflex PCI (remplaçant une isa sur un ancien système).
L'erreur a été trouvée dans une séquence commandant le retour, non exécutée à cause de la non détection de la position maximale dans un sens (450000 pas ou 90 mm).
Pourquoi elle ne la détecte pas? La position réelle se distingue de la position optimale par une erreur de position (following error).
Sortant de Labview, et passant sous CW demo, je fais une succession de Move + et Move - sur une certaine distance, et le problème d'erreur de position se remarque également (la position de retour à la position initiale change constamment: c'est donc un problème intrinsèque à la configuration du système et non de Labview.
Consultant le CD motion control fourni avec la carte, j'ai appris que la configuration du PID avec ses paramètres de gain proportionnel, dérivé, intégral,...conditionnait l'erreur de position.
Seulement, il ne donne pas de piste concernant les valeurs à apporter.
J'aimerais connaitre le programme ou l'endroit où je pourrais obtenir le moyen de trouver ces valeurs (puisque je ne peux les tester directement), voire même ces valeurs.
Fournie en pièce jointe, une capture écran de la présence du Following error dans l'application du CW demo (les valeurs de paramètres du PID sont celles données par défaut)
Attachments:
CWdemoreglage.JPG ‏133 KB

Bonjour,
Afin d'essayer de vous venir en aide, quelle est la carte de contrôle d'axes que vous utilisez?
Cordialement
David D.
Ingénieur d'Applications
National Instruments France

How to control instron 5582 utm thru labview

hi all
i am student and new to labview.
as a part of my project, i need to control an instron 5582 universal testing machine(UTM) thru labview.
is this feasible? can it be done thru a daq card or gpib? any information regarding this will be useful since
i just have 5 mths to complete this.

Mr. Bond,
From the way it looks in the brochure for your Instron 558x, all of the data acquisition and control is built into the hardware. I also noticed that the hardware comes with its own software interface for displaying measurements and utilizing its functionality. If the whole system is integrated, there may be no point to interface with another software program (namely, LabVIEW).
You might try contacting the manufacturer or obtaining a more detailed user manual. Specifically, you are interested in whether the controls and measurements are exposed to the user. For example, there may be a simple connector through which you can control the instrument serially. Or the data acquisition done on the device may be accessible on an output port. Also, I would be quite surprised if the device was GPIB controllable.
Hopefully these can be a few questions to ask the manufacturer to try to use LabVIEW for control and data presentation. Good luck with your application!
Mike D.
National Instruments
Applications Engineer

Triger/transmit light from projector when i sanp from camera with IMAQ PCI 1407

I want to activate projector to emit light when i snap

Take a look at the low level snap example. Put the IMAQ Trigger Drive VI between the IMAQ Configure Buffer and IMAQ Start and set the "trigger drive" input to asserted. This will drive the trigger line as soon as the VI is called. Alternately, you could choose another condition such as "acquisition done" to drive the trigger after the frame is acquired. Please note, as soon as you call IMAQ Close, the trigger line will return to the default tri-state.
Regards,
Brent R.
Applications Engineer
National Instruments

Special/Bonus Depreciation

Hi,
There is one asset on which special/bonus depreciation is applicable say @50% each year. Depreciation is calculated at the end of year. Both ordinary dep and special dep. are calculated correctly.
Now there is further acquisition in the next year to the same asset. At the end of 2nd year, when the depreciation is calculated, ordinary dep is calculated correctly but no special dep. is calculated.
The company is using declining bal. method.
What can be the error. Can anyone help me out.
Regards.

Hi
Acq yr. 2010 / no. of yrs 1,
Acq yr 2011/ no. of yrs 1,
Acq yr 2012 / no. of yrs 1,
With the settings that you have done above - you have told the system that for the Acquisitions done in 2010, Spl Dep is to be calculated for only 1 year.... Same for 2011 and 2012....
Thats the reason system is not calculating it in the 2nd year and onwards... If you want it to be calculated, Change the 1 to 2 or desired no of years.. If you enter 999, then it will be calculated each year and every year
br, Ajay M

Problème installation et configuration d'un système d'acquisition de donnée sous MAX

Bonjour, je suis un nouveau utilisateur de labview ( version d'évaluation 2010).
J'ai téléchargé sur ni.com des exercices et le troisième exercice me fait utiliser MAX (Measurement & Automation Explorer v4.7)
Il est écrit qu'aprè avoir lancé MAX :"Agrandissez l’onglet Périphériques et interfaces et sélectionnez Périphériques NI-DAQmx." puis de faire un clic droit sur "Périphériques et interfaces" et de créer le nouveau périphérique NI-DAQmx (celui-ci sera simulé)
Il se trouve que je n'ai à gauche que l'onglet "Logiciels" dans "Système" et aucun onglet dans "Systèmes déportés"...
Pourriez-vous m'indiquer comment faire apparaître l'onglet "Périphériques et interfaces"?
Avec mes remerciements

Bonjour Ordino,
Le drivers NI DAQmx 9.2.2 est bien compatible avec Windows Vista 32 bits, néanmoins certains éléments sont à prendre en considération:
NI-DAQmx 9.2.2 - Windows 7 64 bit/7 x86/Server 2003 R2 (32-bit)/XP x86/Vista x64/Vista x86/Server 2008 R2 (64-bit)
Vista x86 = Vista 32bits
Support de logiciels dans NI-DAQmx 9.2.2
Support de systèmes d'exploitation
Les systèmes d'exploitation suivants sont supportés par NI-DAQmx 9.2.2 :
Windows 7 (32 et 64 bits)
Windows Vista Professionnel (32 et 64 bits)
Windows XP Service Pack 2 ou version ultérieure
Windows Server 2003 R2 (32 bits)
Windows Server 2008 R2 (64 bits)
NI-DAQmx ne supporte pas les comptes invités sous Windows 7/Vista/XP. Vous devez vous connecter à un compte administrateur ou un compte utilisateur pour pouvoir utiliser NI-DAQmx sous ces systèmes d'exploitation.
Attention Si vous avez fait une mise à niveau de votre système pour passer d'une version antérieure de Microsoft Windows à Microsoft Windows Vista, vous devez désinstaller tous les logiciels National Instruments avant de réaliser cette mise à niveau. Une fois celle-ci terminée, vous pourrez réinstaller vos logiciels National Instruments.
Cordialement,
Rémi D.
National Instruments France
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Acquisition donnée potentiostat

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