Résistance interne sur le NI USB-6008

Bonjour,
je souhaiterais savoir quelle résistance interne est utilisée dans le boitier USB-6008?
Le boîtier doit être utilisé pour des acceptations de matériel.Comment puis je m'assurer que le boitier me donne des résultats conformes et à quelles fréquences dois-je faire étalonner le matériel.

Bonjour,
Merci d'avoir posté votre question sur le forum de national instruments,
Toutes les informations sur le NI USB-6008 sont sur les liens suivants:
http://sine.ni.com/ds/app/doc/p/id/ds-218/lang/fr
http://sine.ni.com/nips/cds/nisearchservlet?nistype=psrelcon&nid=201986&lang=fr&q=FQL:%28%28nilangs:...
Brice S.
National Instruments France

Similar Messages

Error -10401 occurred at AI Group Config - in relation to USB-6008

I'm attempting to run a simple vi that uses AI Aquire Waveforms.vi to input voltage data that I have coming in from the USB-6008 DAQ. However, when I try running the program, I receive the error:
Error -10401 occurred at AI Group Config
Possible reason(s):
NI-DAQ LV: The specified device is not a National Instruments product, the driver does not support the device (for example, the driver was released before the device was supported), or the device has not been configured using the Measurement & Automation Explorer.
And I'm not sure how to fix it. In MAX, the device seems to be working properly and everyhting seems to work fine in the test panel, so I'm slightly at a loss. I'm running Labview 7.1, and installed NI-DAQmx 7.5 which came with the USB-6008.

Never mind. I'm new to Labview, and didn't realize that I could not use the traditonal Data Aquisition components with the USB-5008 (I didn't even realize that NI-Daqmx was different).

How can i connect 24VDC to digital input (usb 6008)

hello,
how can i connect 24VDC to digital input (usb 6008), is it possible with some optocoupler?
thanks

The 6008 is a static DIO, so speed shouldn't be an issue. Therefore an optocoupler should work. Just make sure you get one the meets your specs.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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NI USB 6008 AI acquisition and DO pulse genereation

Dear LabVIEW users,
Greetings for everyone. I am a beginner of LabVIEW and I have a problem, which I have solved partially. I would really appreciate your help and suggestions as I searched for days without any luck. The problem is as following:
I am acquiring AI voltage (continous) from 4-8 accelerometers. At the same time, I am sending a digital output signal each time when the sample rate is clicked (i.e. 1000, 2000, 3000, .... if sampling rate is 1000). In other words, trying to send a digital output signal (at some frequency 'n' Hz) at regular 1 second interval (according to hardware level). So that the digital output signal will blink an LED at every one second. Further, I need to write the AI (voltage) signals, and LED blink PC (software) timestamps separately. All the above said steps are followed in my .vi program but the real hardware/software level operations are killing my timestamps. In other words each LED blink timestamps are not accurate when I use LabVIEW measurement file express VI (difference is not atleast to the third decimal place). In addition, the timestamping is somewhat OK when I disable the LVM file write VI. Onemore thing I noticed is that, physically LED blinks every two second once, I suspect this is due to the shift register and loop delay of second. Is there a way to control the blink speed (i.e. boolean state has to change at every 500ms without delaying the inner while loop).
Results and observations:
LabVIEW 2011 .vi, timestamp files with and without LVM file generator (express VI) are all attached. Please note that there is a considerable amount of drift in consecutive timestamps when LVM file generator is used, on the other hand there is 0.001 ms drift when LVM file generator is not used. The reason for PC timestamps are to roughtly align different measurements or observations or events in global time scale.
Please give me any suggestions or help me to make it atleast accurate for milliseconds within the witten VI. Lastly, is there any relatively inexpensive USB DAQ module which can send a pulse to directly from pulse channel to digital output channels when sample rate of 'n' Hz is achieved by hardware level which could be every accurate, so that software delay is fully minimized. Although there are highly sophistiated hardwares from NI, but our goal of this project is to build and test cost effective system.
Thank you and I really appreciate your inavluable time and effort. Have a great weekend!
With Regards,
Paghalaya
Solved!
Go to Solution.
Attachments:
LabVIEW File Folder.zip ‏113 KB

Paghalaya,
Software timing when using a desktop operating system will never be precise to the millisecond level. The USB-6008 has hardware timing only for the AI function. The DO is software timed.
To get precise 500 ms intevals for the DO, you will need to use a device with hardware timed digital outputs.
Some things which might improve your VI, although they will not solve all your problems:
1. Consider a parallel loop architecture (suche as Producer/Consumer). Moving the File writes to a separate loop from the data acquisition may reduce the timing jitter on the DO.
2. Acquire 500 samples twice per second rather than 1000 samples once per second. That will allow you to get the DO timing closer to what you want. It will not be perfect, but the hardware timing of the AI will help.
3. Dev1/ai0:3 (maybe Dev1/ai0:ai3) should get all four channels at once. I do not have DAQmx so I am not sure of the syntax.
4. You have the Write to Measurement File Express VI set to overwrite the file. Is that what you really want?
Lynn

I have LabView Student Edition, how can I make work a USB 6008?

The Student edition it doesnot have many Vi's that there are necesary to work with a USB 6008, I would like to know how can I make work the Usb 6008 with LabView Student Edition

Hello Jorge,
When you say "NI-DAQmx configuration" do you mean the NI-DAQmx Base Configuration Utility? Are you using NI-DAQmx or NI-DAQmx Base to communicate with the 6008?
NI-DAQmx 7.5 added support for the USB-6008. Therefore, you can use either NI-DAQmx or NI-DAQmx Base to control this device. Make sure that you are setting the USB-6008 to NI-DAQmx before trying to use the NI-DAQmx VIs in LabVIEW. To do this, Open Measurement and Automation Explorer (MAX) and select Tools >> NI-DAQmx Configuration >> NI-DAQmx USB Driver Selector. Your USB-6008 should appear in this window, indicating which driver your device is configured for. Make sure it is set to NI-DAQmx before trying to use the NI-DAQmx VIs.
When your 6008 is set to NI-DAQmx, you cannot use NI-DAQmx Base or any of the DAQmx Base examples. Likewise, when the 6008 is set to NI-DAQmx Base, you cannot use any NI-DAQmx VIs.
If you would like to use NI-DAQmx with your USB-6008, please set the driver by following the steps above and verify that "USB-6008" is listed under "Devices and Interfaces >> NI-DAQmx Devices" in MAX.
I hope this helps. Please let me know if you continue having trouble with your USB-6008.
Regards,
Sean C.

Com use I use quick mi usb-6008

Hola a todos, estaba trabajando con mi usb-6008 sin problema alguno, pero no estoy seguro si se genero un corto y enseguida la usb 6008 ya no quizo trabajar, ahora ya ni siquiera enciende el led, reinicie mi pc, despues por medio del Ni-max trate de ultilizar la opcion de self-test para ver en que estatus estaba mi usb, pero no esta habilitada la opcion cuando vulevo a conectar el usb, mi duda es como saber si el usb-6008 esta o no quemado, por su ayuda GRACIAS

Hola Mejillas:
Te sigas los siguientes pasos, para descartar cualquier opción:
Reinstala/Repara NI-DAQmx
Conecta tu dispositivo al computador
Revisa que el dispositivo USB-6008 se encuentre con los drivers de Windows correctamente instalados en el "Device Manager" de Windows
Considera tener a mano otro cable USB A to USB B, puede ser que esté fallando éste
ve a MAX y asegurate que aparezca un ícono de color verde que diga USB 6008 debajo de la sección "Devices and Interfaces"
Selecciona Test Panels y luego dentro de esa ventana presiona Start
Si luego de estos pasos aún está fallando la tarjeta, entonces yo sospecharía que el problema puede ser el hardware
Aquí tienes un par de link que te pueden servir:
Getting Started : http://www.ni.com/pdf/manuals/375553a.pdf
USER GUIDE AND SPECIFICATIONS: http://www.ni.com/pdf/manuals/371303m.pdf
Saludos
Klaus F. Breuer
Field Applications Engineer
National Instruments Cono Sur
¡Los Kudos son gratis y te hacen feliz!

Generer des impulsions avec la sortie numerique NI USB-6008

Bonsoir
je suis un nouveau utilisateur de labview , j ai un probléme dont j'aimerais que vous m'aidiez
j ai une carte NI USB-6008 et je veux
réaliser des impulsions dont je pourais régler le rapport cyclique , la fréquence et le nombre d'échantillon sur une des sorties numériques sans utiliser la sortie counter ou analogique.
Merci
Cordialement

Bonjour Midas,
Pour réaliser cette fonction vous avez en effet besoin d'utiliser une boucle while ou for avec un control logiciel, comme indiqué par Helmut O'Brian.
Pour ce qui est de la création de votre pattern numérique, il vous faut concevoir un algorithme respectant votre CDC.
Vous pouvez vous inspirer de l'exemple ci-dessous disponible depuis la recherche d'exemple LabVIEW, qui permet d'écrire des données numérique sur un port de façon continue:
C:\Program Files\National Instruments\LabVIEW 2010\examples\DAQmx\Digital\Generate Values.llb\Write Dig Chan.vi
Pour obtenir plus d'information sur l'utilisation du driver NI-DAQmx et de l'API DAQmx, je vous invite à prendre connaissance des éléments présents depuis les liens suivants:
Getting Started with NI-DAQmx: Main Page
http://zone.ni.com/devzone/cda/tut/p/id/5434
Learn 10 Functions in NI-DAQmx and Handle 80 Percent of Your Data Acquisition Applications
http://zone.ni.com/devzone/cda/tut/p/id/2835
Cordialement,
Rémi D.
National Instruments France
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>> Les rencontres techniques de NI - Mesures et acquisition de données : de la théorie à la mise en ...

Communication réseau WIFI NI USB 6008 avec Netbook

Bonjour,
Je souhaiterais faire de l'acquisition de donnée embarqué sur un karting ; je posséde une NI USB 6008, un netbook avec windows seven starter avec le driver 9.5.5 Daqmx et un PC portable sous vista avec labview 2010.
Dans cet configuration je souhaiterai visualiser des températures,pressions... en temps réel si possible ou avec une latence X en bord de piste avec mon PC portable.
Mon soucis est le suivant:
Comment communiquer en réseau wifi avec les deux PC?Suis-je obliger de créer un réseau ad'hoc entre les deux PC?Quel est la différence entre périphérique déporté et périphérique réseau?
Merci d'avance pour votre aide
Romain Cleyet-Merle

Bonjour Romain CM,
RomainCM a écrit :
Mon soucis actuel est de pouvoir créer l'exe mais un VI express récalcitrant m'empéche d'avancer dans mon projet.
Ce Vi est "écrire dans un fichier de mesure".Lors de la construction de l'exe une erreur 1502 intervient et m'empeche de crer l'exe. (Post sur le forum mais pas de réponse d'ingé NI pour le moment)
Ayant des bases trés légere en programmation, je n'arrive pas à trouver sur le net un VI capable d'avoir la meme flexibilité de paramétrage que posséde ce VI express.
Avez-vous essayé d'utiliser la palette de VIs TDMS ? ce format est utilisable de manière simple et performante, de plus vous pouvez lire le fichier sous un tableaur de type Microsoft Excel ou LibreOffice Calc.
Sans utiliser le VI Express, vous pouvez également écrire dans un fichier binaire, tableur ou texte.
De quelle nature sont les données que vous souhaitez enregistrer ? (des waveforms, nombres flottants, tableaux...).
Des problêmes similaires ont déjà été rencontrés, et corrigés par l'abandon du VI express au profit d'un jeu de VI plus adaptés.
Cordialement,
Vincent.O
National Instruments France
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Per-channel gain on USB-6008/6009?

Is analog gain controllable on a per-channel basis on the USB-6008/6009
DAQs? In other words, could AI0 be set to an input range of +/- 10V
while AI1 is set to +/- 1V?

Yes! You sure can set the range on a per-channel basis.
-Alan A.

USB 6008 power up inconsistent

Hi,
Now that I have read enough about the DAQ 6008 and know that the DIOs power up to 5V when it is connected to the USB. And, knowing that , I have worked around it. But, here is my problem. very random behavior occurs in that few channels dont power up and I disconnect the DAQ and connect it back; they do. This random behavior is affecting my system. Should I trust the internal pull up or should I myself pull the voltage up to 5V using an external 4.7k resistor?
Thanks!
V
I may not be perfect, but I'm all I got!

Hi VeeJay,
I just looked through the USB-6008 user manual and specifications (found here) on page 23 it states:
At system startup and reset, the hardware sets all DIO lines to
high-impedance inputs. The DAQ device does not drive the signal high
or low. Each line has a weak pull-up resistor connected to it.
This means that the default power up start would have each of the digital lines set for input and pulled up to 5V internally. You shouldn't need an external pull up, though you can see on page 22 you can definitely add one.
My question is what ports are not at 5V when you plug the 6008 in the first time? Also, is it possible that some of the lines you have connected to the digital ports are driving the lines low? Do you notice this behavior when you don't have anything connected to the 6008?
Eric S.
AE Specialist | Global Support
National Instruments

Rpm sensor diagram using usb-6008

Hi All,
Attached is my block diagram for the RPM sensor that I wan to create. What I'm trying to do is to get the analog input and do a pulse calculation within 60 seconds, and my RPM would be how many pulse * 60. I don't know whether I'm doing it right or not, but I have a feeling that I need to use the digital input rather than analog input. Any comment?
Thanks
Attachments:
rpm sensor design.vi ‏70 KB

Hello Dadsf,
Welcome to the NI Discussion Forums! From your post, you would like to be able to count the number of pulses from your sensor that occur during a period of time and convert this to RPM. Let me know if I have interpreted this incorrectly. Your USB-6008 manual indicates that the device has a built in counter that can be used to count falling edge signals. If your sensor outputs digital signal this would be a good way to go. You can take the number of pulses that occur over a certain period of time (perhaps between two loop iterations) to find the number of pulses per second. The longer the period of time you acquire pulses for, the more accurate your average RPM will be. This will be at an expense of how often the user is updated with a new RPM value. Check out the links in my signature for some great information on how to get started with DAQmx and what all of the different terms in the DAQ Assistant mean.
I noticed that your DAQ Assistant was set to 1 sample on demand. What this does is causes the USB-6008 to read a single sample from the analog input during each iteration of the loop. I am not sure if that is the behavior you are looking for. Another option would be to setup the task as continuous hardware timed analog input (change the Acquisition mode to Continuous Samples with you desired sample rate and the desired number of samples you would like to read at a time). This will give you a waveform of data that should show the pulses over a period of time. You could then count the number of pulses that occur over the length of the waveform. This would be the equivalent of the number of pulses per second that could be converted to RPM. This method requires a little more processing than the first method, but could give you a little better accuracy. Post back if you need more info.
Regards,
Browning G
FlexRIO R&D

Can I use more than one USB 6008 in the same program?

I am working on a project that may require up to six USB-6008 modules. Before I purchase more I need to know if I can use all six at a time in the same Lab View program. Can anyone help?
Solved!
Go to Solution.

Hello Nick,
LabVIEW is able to handel that number of DAQ tasks quite easily, however you must remember that USB has a maximum bandwidth. Therefore you would have to ensure that you have enough USB hubs on your PC. Typically there are between two to four USB slots per hub and each of these will have a maximum throughput rate which will divided between all devices attached to that hub. Therefore although you may have four USB DAQ devices attached to four USB ports if they are on the same hub you may notice greatly reduced rates of data transfer. What I would suggest rather than purchasing six or more USB 6008, why not purchase one PCI card which is able to handel many more inputs with a larger bandwidth.
Regards
Andrew George @ NI UK

Will USB-6008 DAQ be able to power and record voltage for UMS T5 tensiometer at the same time?

I would like to use my NI USB-6008 to provide power to my UMS T5 tensiometer (http://www.ums-muc.de/en/products/tensiometer/t5.html) as well as take readings from it, but I don't know if this is possible to do properly. The supply voltage for the instrument can be as low as 5V, which I can easily get from the dedicated +5V channel. I am able to power the instrument and connect it to an analog input on the 6008 and measure a voltage in differential mode. However, while reading the support literature for the instrument, I find the following:
"Potential data acquisition pitfalls: Because the pressure transducer is configured in a Wheatstone full bridge, the input voltage and signal mV output cannot be connected to the same reference (ground). Hence, the signal mV output can only be measured using a differential voltage measurement. Therefore, do not attempt to make a single-ended measurement of the pressure transducer mV output." (http://www.decagon.com/assets/Uploads/MeasuringUMSTensiometerswithnon-UMSControlandDataAcquisitionSystems.pdf)
My understanding is that the 6008 can take a differential measurement if I attach the signal "+" and signal "-" to the positive and negative analog input terminals. However, it seems that all of the Ground ports on the 6008 are grounded to the same reference, which would make my voltage measurement invalid according to the paragraph above. So my real questions is: if I attempt to record the voltage using one of the analog inputs on the 6008 in this way, is the measurement valid? Or do I need to find a separate power supply with a different reference ground to ensure that the measurement is accurate?

The specification sheet for that device is very poor. The manual is not much better. Companies which want to sell scientific equipment should publish decent data sheets or get out of business.
In section 3.4.3 General requirements the device is described as a "non-amplified bridge circuit." This information along with the bridge impedance should be in the specifications because it is essential to applying the device under any circumstances other than the nominal behavior at 10.6 V.
The answer to your question is this:
You can use it with the USB-6008. The 5 V power supply will result in output voltages slightly less than half (5/10.6) the voltages specified under nominal conditions. You can use the differential input mode on the USB-6008. The absolute input voltages will be about 2.5 V with the 5 V supply. That voltage is within the working range of the device. The differences will probably be less than 100 mV. The resolution of the USB-6008 on the +/-1 V range is about 0.5 mV so your pressure resolution will be around 1 % of full scale. The input impedance and termination voltage of the USB-6008 will introduce some errors. These may be on the order of 5-10%. I cannot predict much better without the missing bridge impedance specification. Those errors should be systematic and relatively constant. A calibration of the whole system - sensor and DAQ device together should allow you to compensate for much of that error.
Lynn

NI-DAQmx 8.3.0f0 installed but Found New Hardware Wizard shows up when plugging in a USB-6008

I have NI-DAQmx Device Driver 8.3.0f0 installed with LabVIEW 8.2 but when I plug in a NI USB-6008 I see the "Found New Hardware Wizard" in Windows XP. Since the DAQmx driver is installed shouldn't Windows recognize the device immediately?
I cancel the driver and I get the taskbar message "A problem occurred during hardware installation. Your device may not work properly."
The USB-6008 does not appear under Devices and Interfaces in MAX.
Help would be appreciated.
Thanks,
Dave

Ahh, I thought Windows performed an automatic search after cancel is clicked.
I clicked next and allowed Windows to search and it says:
"Cannot Start this Hardware"
There was a problem installing this hardware: USB-6008
The device cannot start. (Code 10)
I tried uninstalling and reinstalling the device but the results were the same.
Any ideas?

NI USB 6008: expected constant expression

I am using NI USB 6008 device. Looking at NI-DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage\Acq-Int Clk\
So I want to modify the line that has
DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,1000,10.0,DAQmx_Val_GroupByChannel,data,1000,&read,NULL));
as
    DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,numsamps,TimeouT,DAQmx_Val_GroupByChannel,data,numsamps,&read,NULL));
where the corresponding variables have been defined before like:
Int_t xx=2;
const Int_t numsamps = const_cast<Int_t&>(xx);
    int32       error=0;
    TaskHandle taskHandle=0;
    int32       read;
    float64     data[numsamps];
    float64 RatE = float64(raTE);
    float64 TimeouT = float64(numsamps)/RatE;
But when I try to compile I get this error message:
$ nmake -f makefile.mak
Microsoft (R) Program Maintenance Utility Version 8.00.50727.42
Copyright (C) Microsoft Corporation. All rights reserved.
        cl -D_MT -D_DLL -MDd -EHsc -nologo -G5 -GR -MD -DWIN32 -DVISUAL_CPLUS
PLUS -D_WINDOWS -IC:\ROOT/include -O2 -c SNatInDAQ.cpp
cl : Command line warning D9025 : overriding '/MDd' with '/MD'
cl : Command line warning D9002 : ignoring unknown option '-G5'
SNatInDAQ.cpp
SNatInDAQ.cpp(261) : error C2057: expected constant expression
SNatInDAQ.cpp(261) : error C2466: cannot allocate an array of constant size 0
SNatInDAQ.cpp(261) : error C2133: 'data' : unknown size
NMAKE : fatal error U1077: '"c:\Program Files\Microsoft Visual Studio 8\VC\BIN\c
l.EXE"' : return code '0x2'
Stop.
What does it mean 'expected constant expression'? How can I get around this?
What I want to do is pass the size of that data array from another function.

Hi novaiscool,
I think the issue is that you are declaring numsamps as a constant and the DAQmxReadAnalogF64 function wnats a non constant parameter. Have you tried calling the function with a regular int or a value? Give that a try and see if you get the same error.
You will also need to initialize numsamps to something since you are allocating an array using that variable.
Give those things a try and let me know how it works.
Thank You,
Nick F.
Applications Engineer

Résistance interne sur le NI USB-6008

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