Re: problem with color
Hi thanks for your ans. I had use color to RGB vi, and find it's RGB component I am more interested in starting with a color and move it towards black or white I was unable to do it. can you tell how to achieve it, Can I use color ramp for this If yes then how to use it. if possible send example vi Please help.
How to apply 1/3 octave bandpass filter of about 10Khz on a signal
I would like to know if octave filtering is possible in Labview.
problem with NI- TIO Examples
bonjour, mat=E9riel utilis=E9: lab view 7 et driver nidaq et carte pci-6602 je dois simul=E9 8 signaux de facon synchrone c est =E0 dire =E0 partir de to,et qui sont non periodique. j'ai donc utilis=E9 pour r=E9aliser une partie du probleme, le code librairie Multiple Pulse-Train Generation with Phase Shifts (NI-TIO)(qui me permettra de simuler 4 signaux) NI-TIO =3D qu est ce que c est ? est ce un driver ? est ce compatible avec la PCI 6602 et NI DAQ? je n arrive pas a synchronis=E9 via une gate (je rentre un signal exterieur sur la gate du compteur 0 tout en validant les autres criteres n=B0device , freq utilis=E9e, duty cycle ). Cependant j arrive =E0 obtenir un signal qui est periodique en mettant le start trigger en mode disable. Or il faudrai que le mode soit enable pour la synchro mais cela ne fonctionne pas. j espere avoir clarifi=E9 ma question. cordialement, dider
Re: Passing parameters to VIs
If I'm not mistaken, all data operations done on references must be done in the UI thread. Depending on what thread the sub-vi is normally running in, this can have severe performance issues. Have a look a href=http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101RPAGEID=135HOID=506500080026CBUSEARCHCONTEXT_CATEGORY_0=_49_%24_6_USEARCHCONTEXT_CATEGORY_S=0UCATEGORY_0=_49_%24_6_UCATEGORY_S=0;here/a for more information. Shane.
Re: NI-IMAQ 1394 image display
Hello, I didn't manage to find where to download the driver on this website ( I subscribe to the technical support but the driver is not there ). Could you give me the complete URL ? thank you very much !
How to apply 1/3 octave bandpass filter of about 10Khz on a signal
I am unable to retrieve the time signal after doing the 1/3 octave analysis.
pci-6602 :comment fonctionne le vi counter start trigger et a quoi sert_il?
j utilise l exemple multiple pulse train with phase et je veux synchronis=E9 mais signaux via une gate exterieur (que je connecte sur la gate du compteur 0) j'obtiens bien un signal mais non synchronis=E9 cordialement, didier.
Re: CIN memory problem
You are 100% right! Thank you, Pier
Re: TRANSFORM A TEXT FROM TXT FILE
Please, can you send another time your vi? I can't charge it with my labview, my computer said: there was an error. Perphaps the problem is that my labview is 5.1 version. Thanks a lot. IMMA
Re: TRANSFORM A TEXT FROM TXT FILE
Please, can you send another time your vi? I can't charge it with my labview, my computer said: there was an error. Thanks a lot. IMMA
Re: how to exchange data between two labview programs running on independent machines?
One of the easiest ways would be to use the VI server. There are many examples on how to do this that come with labview.(7.0) Do a search on server and you will find many ways. Joe
filter data
Hi I need to filter some data, its basically ratio values verses time for a temperature sensor. I'm already using an averaging filter but the overall response of the sensor changes. This is shown when you run the attached VI and select the text file. One graph shows prefiltered data while the second shows filtered data. Can you suggest a filter that would filter the data without changing its response, any help at all would be greatly appreciated, Best regards, Mary.
Re: How do I get the tools palette to be visible in labview 7? It is not listed under windows
I'd turn this option off as the others pointed out. It is annoying. You can also get the Tools palette by holding the 'Shift' key down while right-clicking. This works on both front panel and block diagram. This is nice to know if you use the auto tool as it's a quick way to get to the tool palette.
Re: how to implement only if statement using case structure
Thanks buddy, It just worked the way I want.
Re: filter data
Please repost your VI. Second any of the filter Vi's should work.
How do I get the tools palette to be visible in labview 7? It is not listed under windows
The winow dropdown list does not even list show tools pallete. The auto tool is driving me crazy
Probleme sur ecriture disque,
une application labview qui ecrit des donn=E9e ( toutes les 50ms) dans
des fichier texte ( format texte tabul=E8) ... le nom du fichier
changeant environ toutes les minutes , provoque une erreur ( apr=E9s un
temps d'execution ind=E9termin=E9...) :
Ecriture d=E9cal=E9 =E0 echouer : Windows n'as pu sauvegarder toutes les
donn=E9es dans le fichier \Device1\HarddiskVolume1\Donnee\Fichier1.tsv
..cette erreur peu =EAtre du =E0 une panne mat=E9riel ou r=E9seau...
##
dans le gestionnaire d'=E9venement l'on trouve
--
Type de l'=E9v=E9nement=A0:=09Avertissement
Source de l'=E9v=E9nement=A0:=09Disk
Cat=E9gorie de l'=E9v=E9nement=A0:=09Aucun
ID de l'=E9v=E9nement=A0:=0951
Date=A0:=09=0915/04/2004
Heure=A0:=09=0922:37:01
Utilisateur=A0:=09N/A
Ordinateur=A0:=09PCTEST
Description=A0:
Une erreur a =E9t=E9 d=E9tect=E9e sur le p=E9riph=E9rique \Device\Harddisk0=
\DR0 au
cours d'une op=E9ration de pagination.
Donn=E9es=A0:
: 04 00 22 00 01 00 72 00 .r.
0008: 00 00 00 00 33 00 04 80 3..?
0010: 2d 01 00 00 15 00 00 c0 -..=C0
0018: 00 00 00 00 00 00 00 00
0020: 00 aa 36 56 04 00 00 00 .=AA6V
0028: 00 00 00 00 00 00 00 00
0030: 00 00 00 00 2a 00 00 00 *...
0038: 02 84 00 00 00 21 05 00 .?...!..
0040: 2a 00 02 2b 1b 55 00 00 *..+.U..
0048: 11 00 ..
-
Puis :
Type de l'=E9v=E9nement=A0:=09Avertissement
Source de l'=E9v=E9nement=A0:=09Ftdisk
Cat=E9gorie de l'=E9v=E9nement=A0:=09Aucun
ID de l'=E9v=E9nement=A0:=0950
Date=A0:=09=0915/04/2004
Heure=A0:=09=0922:37:01
Utilisateur=A0:=09N/A
Ordinateur=A0:=09PCTEST
Description=A0:
{Perte de donn=E9es en =E9criture retard=E9e} Le syst=E8me a essay=E9 de
transf=E9rer des donn=E9es du fichier depuis les tampons vers
\Device\HarddiskVolume1. L'=E9criture a =E9chou=E9, il se peut que seulemen=
t
quelques donn=E9es aient =E9t=E9 =E9crites dans le fichier.
Donn=E9es=A0:
: 00 00 04 00 02 00 56 00 ..V.
0008: 00 00 00 00 32 00 04 80 2..?
0010: 00 00 00 00 00 00 00 00
0018: 00 00 00 00 00 00 00 00
0020: 00 00 00 00 00 00 00 00
0028: 15 00 00 c0 ...=C0
ensuite :
Type de l'=E9v=E9nement=A0:=09Informations
Source de l'=E9v=E9nement=A0:=09Application Popup
Cat=E9gorie de l'=E9v=E9nement=A0:=09Aucun
ID de l'=E9v=E9nement=A0:=0926
Date=A0:=09=0915/04/2004
Heure=A0:=09=0922:37:01
Utilisateur=A0:=09N/A
Ordinateur=A0:=09PCTESt
Description=A0:
Application popup=A0: Windows - L'=E9criture d=E9cal=E9e a =E9chou=E9=A0: W=
indows
n'a pas pu sauvegarder toutes les donn=E9es pour le fichier
\Device\HarddiskVolume1\AppLW\Donnee\Cycles\8464.tsv. Les donn=E9es
ont =E9t=E9 perdues. Cette erreur peut =EAtre due =E0 une panne de votre
mat=E9riel ou de votre connexion r=E9seau. Essayez de sauvegarder ce
fichier =E0 un autre emplacement.
Ensuite les 2 evenements suivants se r=E9p=E9te
--
Type de l'=E9v=E9nement=A0:=09Avertissement
Source de l'=E9v=E9nement=A0:=09Disk
Cat=E9gorie de l'=E9v=E9nement=A0:=09Aucun
ID de l'=E9v=E9nement=A0:=0951
Date=A0:=09=0915/04/2004
Heure=A0:=09=0922:37:02
Utilisateur=A0:=09N/A
Ordinateur=A0:=09PCTEST
Description=A0:
-
Une erreur a =E9t=E9 d=E9tect=E9e sur le p=E9riph=E9rique \Device\Harddisk0=
\DR0 au
cours d'une op=E9ration de pagination.
Type de l'=E9v=E9nement=A0:=09Avertissement
Source de l'=E9v=E9nement=A0:=09Ftdisk
Cat=E9gorie de l'=E9v=E9nement=A0:=09Aucun
ID de l'=E9v=E9nement=A0:=0950
Date=A0:=09=0915/04/2004
Heure=A0:=09=0922:37:02
Utilisateur=A0:=09N/A
Ordinateur=A0:=09PCTEST
Description=A0:
{Perte de donn=E9es en =E9criture retard=E9e} Le syst=E8me a essay=E9 de
transf=E9rer des donn=E9es du fichier depuis les tampons vers
\Device\HarddiskVolume1. L'=E9criture a =E9chou=E9, il se peut que seulemen=
t
quelques donn=E9es aient =E9t=E9 =E9crites dans le fichier.
#
=E0 la suite de ce probl=E9me le PX : PXI-8175 sous Windows 2000 pro ,
avais des probl=E9mes pour ecrire sur disque dur ... un red=E9marrage et
un scandisck =E0 remis les choses en place
auriez vous une id=E9e sur l'origine et la cause du probl=E9me ...
merci d'avance
Re: While installing LabVIEW 7 Express on MS2000, I get Fatal Error Unhandled MSI Error
i had the same problem and i 'think' i neede to get the latest installer... good luck
Feature request and how-to info for EXE icons
I would like to request for future versions of LabVIEW, support for higher resolution, and higher color resolution, icons imported into the compiled application. Currently it is possible to use an icon editor to create an icon with several images of different size and color resolution that can be imported as an independent icon in the VI application building process, by selecting the Application Settings tab and loading a custom icon. Currently however the LabVIEW application builder will only import 4 of the images into the executable. These are: 32x32, 16 color black/white 16x16, 16 color black/white Windows however (newer versions anyway) will support higher resolution 48x48 true color icons, which definitely have a more realistic appearance, especially when using shrunken pictures as part or all of the icon. As a workaround, using a resource editor these higher resolution icons may be 'hacked' into the compiled executable, but cannot be imported during the build process using a pre-constructed icon (*.ico) file. This is great if you're into doing things manually just to get the job done, but it requires time and effort for each build, and also makes it an out-of-the-question option when building applications from controlled source code. For those reasons, I would like to request this be changed in future versions of the application builder. For those interested in icon modification, here are some freeware utilities to try: google: IconEdit32 -- iedit32.zip -- Icon editor capable of saving multiple icon variations to a file... easy to use for changing the icons of a LabVIEW app that is going to be compiled. google: peresourceexplorer -- PE Resource Explorer -- Utility to 'hack' into an executable and modify icons so they are higher resolution and higher color resolution than LabVIEW will allow by default. google: Irfanview -- Highly functional image browsing program -- good in this particular case for resizing jpgs down to icon size so they can be cut and pasted into an icon editor.
Re: TRANSFORM A TEXT FROM TXT FILE
Have you tried the Read From Spreadsheet File function (File I/O palette)? Use a , as the delimter and it should work just fine for your file. If it doesn't, could you post the text file you're trying to read?
Re: Can i make the communication of Raynger MX4/MX6 ?
It should be fairly easy to do. Start with the shipping examples for serial comm (i.e. LabVIEW - Serial). Both the writes and reads are terminated with CR/LF so for the VISA Configure Serial Port, you need to specify xDA for the termination character and inside that function, add the Serial End Mode for Writes to the VISA Instr property node and use TermChar as a value.
Looking at drwatson logfile, can you tell me why my app crashed?
--3456573.1082135248519.JavaMail.quiq.tekken Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit I recently updated one of our PC test systems to SP4 (WIN2kPro). It has AMD cpu 1 GHz, 256 MB RAM. It ran a test for the past 13 days then my LabVIEW app crashed this morning. The drwatson logfile pins the rap on my LV app. I wonder if it had something to do with the recent update of the OS (just before starting the test). The event log shows there was not a reboot, and the drwatson log shows the same time as the last entry in the data file the test was producing. Does anyone at National Instruments know how to use the drwatson log file to discover the direct cause of the crash? --3456573.1082135248519.JavaMail.quiq.tekken Content-Type: application/octet-stream; name=drwtsn32.log Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=drwtsn32.log Content-Description: DrWatsonLogFile Microsoft (R) Windows 2000 (TM) Version 5.00 DrWtsn32 Copyright (C) 1985-1999 Microsoft Corp. All rights reserved. Application exception occurred: App: svchost.exe (pid=416) When: 3/22/2004 @ 10:59:11.193 Exception number: c005 (access violation) * System Information * Computer Name: SS100-DUR4 User Name: SYSTEM Number of Processors: 1 Processor Type: x86 Family 6 Model 4 Stepping 2 Windows 2000 Version: 5.0 Current Build: 2195 Service Pack: 2 Current Type: Uniprocessor Free Registered Organization: Registered Owner: Delphi * Task List * 0 Idle.exe 8 System.exe 168 smss.exe 192 csrss.exe 188 winlogon.exe 240 services.exe 252 lsass.exe 416 svchost.exe 444 spoolsv.exe 476 svchost.exe 504 mgabg.exe 592 regsvc.exe 608 MSTask.exe 732 Explorer.exe 808 PDesk.exe 816 CreateCD50.exe 844 DirectCD.exe 780 PLXTASK.exe 648 drwtsn32.exe 0 _Total.exe (0100 - 01005000) (77F8 - 77FFB000) (77DB - 77E0B000) (77E8 - 77F35000) (77D4 - 77DB) (77A5 - 77B46000) (77F4 - 77F7C000) (77E1 - 77E74000) (7619 - 761CD000) (7800 - 78046000) (77C1 - 77C6D000) (7503 - 75043000) (7502 - 75028000) (77BE - 77BEF000) (74FF - 75002000) (7798 - 779A4000) (7505 - 75058000) (74FD - 74FEF000) (7501 - 75017000) (785C - 785CC000) (7734 - 77353000) (7752 - 77525000) (7732 - 77337000) (7515 - 7516) (7517 - 751BF000) (751C - 751C6000) (7795 - 77979000) (779B - 77A4B000) (773B - 773DE000) (7738 - 773A2000) (7783 - 7783E000) (7788 - 7790D000) (774E - 77512000) (774C - 774D1000) (7753 - 77552000) (77B5 - 77BD9000) (77C7 - 77CBA000) (7736 - 77379000) (775A - 77625000) (777E - 777E8000) (777F - 777F5000) (754B - 754B5000) (782D - 782EE000) State Dump for Thread Id 0x19c eax=0025 ebx= ecx=0024 edx= esi= edi=0048 eip=77f82861 esp=0006fc38 ebp=0006fca8 iopl=0 nv up ei pl zr na po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs= efl=0246 function: NtReadFile 77f82856 b8a100 mov eax,0xa1 77f8285b 8d542404 lea edx,[esp+0x4] ss:00aed20b= 77f8285f cd2e int 2e 77f82861 c22400 ret 0x24 * Stack Back Trace * FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name 0006FCA8 77DC9385 0048 0006FD80 0216 0006FCD0 ntdll!NtReadFile 0006FCD4 77DC9225 0048 0006FD80 0216 0006FD0C advapi32!StartServiceCtrlDispatcherW 0006FD50 77DC8F76 0048 0006FD80 0216 00074738 advapi32!StartServiceCtrlDispatcherW 0006FFB0 0100113D 00074738 006C0061 0044 77E97D08 advapi32!StartServiceCtrlDispatcherW 0006FFF0 010010B8 00C8 0100 svchost!nosymbols * Raw Stack Dump * 0006fc38 b6 73 e8 77 48 00 00 00 - 00 00 00 00 00 00 00 00 .s.wH... 0006fc48 00 00 00 00 80 fc 06 00 - 80 fd 06 00 16 02 00 00 0006fc58 00 00 00 00 00 00 00 00 - 0c fd 06 00 2b 73 e8 77 +s.w 0006fc68 80 fd 06 00 00 00 00 00 - 01 00 00 00 c0 55 07 00 .U.. 0006fc78 94 fd 06 00 00 00 00 00 - 70 00 00 00 50 47 07 00 p...PG.. 0006fc88 a0 01 00 00 00 00 00 00 - 60 fc 06 00 40 fd 06 00 [EMAIL PROTECTED] 0006fc98 40 fd 06 00 5b 61 e8 77 - e8 73 e8 77 ff ff ff ff @...[a.w.s.w 0006fca8 d4 fc 06 00 85 93 dc 77 - 48 00 00 00 80 fd 06 00 ...wH... 0006fcb8 16 02 00 00 d0 fc 06 00 - 00 00 00 00 c0 55 07 00 .U.. 0006fcc8 80 fd 06 00 00 00 00 00 - 00 00 00 00 50 fd 06 00 P... 0006fcd8 25 92 dc 77 48 00 00 00 - 80 fd 06 00 16 02 00 00 %..wH... 0006fce8 0c fd 06 00 38 47 07 00 - 00 00 00 00 00 f0 fd 7f 8G.. 0006fcf8 cd df d4 77 90 47 07 00 - 94 fd 06 00 00 00
Re: [WinXP/LabView7.0]Reading parallel port is too slow...
If you're trying to acquire a 16-bit sample at 1MS/s, using the parallel port, it will not work. In fact, many full-fledged DAQ cards do not support this high sampling-rate/resolution combination. Look at what NI has available here, in the S and E series DAQ boards--this should give you a feel for what's out there and what a professionally manufactured piece of equipment is capable of: http://sine.ni.com/apps/we/nioc.vp?cid=10955lang=US http://sine.ni.com/apps/we/nioc.vp?cid=1038lang=US As you noted already, a parellel port is going to be extremely slow for your needs, and likely not only be slow, but also have a pretty fair amount of timing jitter, since the timing of your read calls will be indeterminate. I would definitely recommend you look into some other hardware acquisition option besides your parallel port... it won't get you very far unfortunately, because that isn't what it's really designed for.
Counting more than 65535 count with ICTR_CONTROL.VI
I want to count pulse at a rate of 100 000 Hz, how can I do that with ICTR control? I use 8253 counter and the COUNT_EVENT.VI
Re: how to implement only if statement using case structure
I think something strange is going on here. Placing the indicators in the True case and not writing to them when you do not have a match should leave the last value written displayed. I do this all the time and have never had this problem. I dropped a new meter and connected it to the same place inside the true case right beside the original meter, and it holds the value while the original goes back to zero. I even copied the original meter and it works as it should. Try deleting your indicators and dropping new ones to see if that fixes the problem. Ed
Re: LabVIEW Licensing question
On Thu, 15 Apr 2004 10:40:45 -0500, s wrote: I have purchased one copy of LabVIEW Full Dev. System 6.0. It has since been upgraded to 6.1 and 7.0. My questions are about licenses: 1. Am I allowed to install LabVIEW 7.0 on multiple machines, if I'm the only developer who will use LabVIEW at anytime? 2. Can I legally install LabVIEW 6.0 on one machine, 6.1 on another and 7.0 on a third for use by different developers? Hello Stephen, That's a big NO to everything you asked. There is another option. I see from your header that you're a Linux user. Is it possible that you're using LV for Linux too? If yes, then you should consider thin clients. For more info go to ltsp.org. Then dig through the NI software license agreement (NISLA). You should find it interesting. Contact me directly if you have questions (just look at my header and remove the killspam).
Source Control Error 25581
LabView 7, VSS 5.0, eror 25581, Win 98. Source Safe worked with version 6.1. I used an error cluster to find what 25581 is - and it came up with a bogus result Error undefined.. When trying to connect to VSS error 25581 states Visual Source Safe does not appear to be installed. Is there a fix? Is there a work-around to use VSS w/LabView 7.0?
Re: use start trigger with pci 6602 with driver ni daq
Hi Didier, NI-TIO is the chipset of counter/timer devices, so that you need to use NI-TIO-referenced examples. You can find examples from www.ni.com/examples and specify your software and hardware. To synchronize your counters, you can use one of them to generate a clock and then connect this clock to the gate of the other counters. You have to specify that you use external clock in the VI, which configure the device. The driver for using your device is NI-DAQ. Isabelle Jean Applications Engineer National Instrument
Re: LabVIEW Licensing question
Hello Stephen, According to the Software Licensing Agreement you can have only one active copy of your software installed at a time. Also, in this agreement, the term software includes all upgrades provided by NI. So, Joe is correct with his statement about your upgrades falling under the same agreement that was initially purchased for 6.0 and you are legally allowed to have one of these copies active at a time. For more information about licensing please visit a href=http://www.ni.com/license/;www.ni.com/license/a. Regards, Jyoti F National Instruments
Re: Using GPIB to talk to HP4083A Switching Controller.
Hi Lori, Your attachments are all showing 0 bytes, could you try them again? Thanks, Scott B. Applications Engineer National Instruments
Re: Complex data structure.
I like the typedef constant wraped in a sub-VI. Alot less space on the diagram, and no issues when the typedef is modified and the updated constant on the diagram ending up larger than the structure it is in. Another plus is that it can be used to establish default values. Any filed of the typedef that should have a specific default value can be implemented by doing a bundle by name inside the sub-VI. I have seen code fail because a constant on a diagram lost its default values when the type def was updated. This makes sense to me becuase if a new field is added to the structure we do not know what its defaults should be. So you get 1) Smaller diagram foot print 2) Ability to define global default values by wraping the default in a sub-VI. Ben
Re: Filter Express vi building appllication problem.
Neuvos, This problem with the Filter express VIs built into exeuctables has already been reported to LabVIEW engineers, and they are working on a solution. For now, a workaround is to convert the particular filter express VI into a regular VI. To do this, right-click on the express VI and select Open Front Panel. Select Convert in the dialog window. Then just save the opened VI into your project directory. Zvezdana S. National Instruments
Re: use start trigger with pci 6602 with driver ni daq
I wrote you a long reply in the Measurement Hardware -- Counter/Timer forum recently, but it was all in English. (I studied French in school, but remember only enough to *mostly* understand your note.) Please reply in the Counter/Timer forum if you need translation help. Perhaps someone out there who's fluent in both French and English can help.
Re: How do I determine the number of plots on a waveform graph?
Sounds like you really want to know how many waveforms are in the dynamic data. In your Convert from Dynamic Data node, change from 1D array of scalars - automatic to 1D array of waveform and then use Array Size on that.
Re: Application Memory Full - how do I stop this?
Rolf: Thanks for your input. I'll look into the loops. randy
Re: Menus and EventStructures
If I understood correctly, you've got 2 Event structures. If so you have to be very careful if they are placed in a loop. I suggest you use only one Event Structure. See in labView help (Event structures) for more info on things to take care of when using event structures. On menu items, you're doing the right thing when handling the event This VI - MenuSelection (User), the Tags enable you to process the events in a case Structure. A single event is generated when selecting a menu item. Hope this helps ! Julien
Re: 4-20ma output of ph controller connection to pc to monitor
Brett, I looked at the specs for the datataker dt50 and I noticed that it has a serial port interface. You may be able to send commands to the dt50 from LabVIEW and the dt50 may respond with data. You will need to get the command set from datataker. Here are some links to tutorials that explain getting started with serial programming: http://zone.ni.com/devzone/devzoneweb.nsf/Opendoc?openagent14A5CB349BD18D20862568210005EB0A#2 http://zone.ni.com/devzone/conceptd.nsf/webmain/C553228FD78A7ADD862568F9006E9129?opendocument http://zone.ni.com/devzone/conceptd.nsf/webmain/D48BA43C59B60277862569EE000501FD?opendocument There are also some good serial communication examples that ship with LabVIEW. Go to Help Find Examples Hardware Input and Output Serial Regards, Bill B.
Re: continuous transfer function
Coefficients of the numerator of the transfer function, starting from lowest to highest order. b[0] =3D 1.00 and does not need to be entered. Only enter b[1], b[2], and so on. For example, the 3rd order polynomial as described by the 3-element array B[0...2] would be 1 + B[0]X + B[1]X^2 + B[2]X^3 Coefficients of the denominator of the transfer function, starting from lowest to highest order. For example, the 2nd order polynomial as described by the 3-element array A[0...2] would be A[0] + A[1]X + A[2]X=B2
Re: source code for 2d cross-correlation fx?
thanks, i will take a look...The correlation fx uses the FFT so I suppose if starting from scratch with the FFT and knowing the algorithm for correlation, I can make the modifications as needed. Cross-correlation involves multiplying the FFT of one fx by the complex conjugate of the FFT of the second fx (I believe). Since LabVIEW and IMAQ have all these operations, I should be able to work with this. Sincerely, Don
Re: Continuous data acquisition and writting to file
Thanks a lot.
While installing LabVIEW 7 Express on MS2000, I get Fatal Error Unhandled MSI Error
Setup program fails after the second aceptance screen.
Re: Can Labview 6 be used with a Validyne UPC 607 DAQ board?
The best place to get drivers and information on them is from the vendor. See if they offer a set of LabVIEW VIs that you could use instead of the shipping DAQ functions that only work with NI boards. If they don't have any VIs, then ask what kind of programming interface they offer. If it's a DLL, then you'll need documentation on the function names and parameters. You can then use the Call Library Function. If they offer an ActiveX interface, then you'll need documentation on the available methods and properties. LabVIEW has ACtiveX functions on the CommunicationsActiveX palette.
Using labview, Is there a keypad system to seperate and distribute LN2?
Currently we are using labview to account for building usage. We would like to use this and be able to break down each users total usage of LN2. The is a new fill station being installed. A meter from Micromotion is already metering the usage from the tank. We would like to find a solution to break this down to user groups, with possible keypad. For accounting purposes
Limit to the sampling rate for an HP4192 Impedance Analyzer?
I'm running my HP 4192 Impedance Analyzer in a FOR loop to take a new measurement (of Capacitance) at set intervals. I can't get the intervals any smaller than 1 second, regardless of using the Labview Wait ms sub vi. Also this doesn't seem to be a Labview issue, because when I remove the instrument sub vi from the FOR loop, it can execute as fast as I choose. Does the HP 4192 have this known sampling rate limitation? That would not surprise me, I know it's an old piece of hardware.
Re: How can I get the x-value of first (or last) element in history-data of a chart?
Hi Chrisger, If you don't have an X scrollbar, the last element in the history should always have the X value XScale.Range:Maximum. Then this formula should bring you the X value for the first element in the history buffer: XScale.Range:Maximum - (HistoryLength * XScale.Multiplier) If you are using a scrollbar, then I can see no way of calculating the correct X values, since you cannot read the scrollbar's position. The best way to solve this problem is propably to track the number of data points while writing to the diagramm. Then you don't need any X scale information from the diagramm, you just use it's history buffer to store your data. Richard H. National Instruments
Re: Continuous data acquisition and writting to file
Hello Azad, Since the PD2-MF-16-400/14H is not a NI board and does not use the NI-DAQ driver, we do not have any examples that you will be able to run with your hardware. We do, however, have examples that show how to continuously acquire data and write to a file using the NI-DAQ driver. These programs are included in your example finder when you install the NI-DAQ driver. I suggest looking at these programs as a model for your own program which will be using the appropriate DAQ driver. After you install NI-DAQ, the example programs will be located under Hardware Input and OutputTraditional DAQAnalog InputStream to Disk in the NI Example Finder. Please click a href=http://digital.ni.com/softlib.nsf/websearch/C1F802E457EA042586256DD1B0C9?opendocumentnode=132060_US;here/a to download the NI-DAQ 7.1 driver. I hope this helps! Regards, Jyoti F National Instruments
Re: how to exchange data between two labview programs running on independent machines?
Hello NELCO, One very simple solution for transferring data between two LabVIEW programs running on different computers is to use DataSocket. Take a look at the DS Reader.vi and DS Writer.vi which are two examples that are shipped with LabVIEW. You can find these VIs by going to the NI Example Finder and typing datasocket in the search tab. Regards, Jyoti F National Instruments
Re: external clocking proble with NI-DAQ 6534 after driver upgrade
Michael: What version of NI DAQ did you have? What version did you upgrade to? Is your 6534 a PCI board or is it an AT/ISA based device? Have you changed your code at all? You code should be fully compatible with a new version of NI-DAQ... Please provide more exact details of the problem so I can help futher. Are you getting errors or is it just not working? Sincerely, Brooks B Applications Engineer National Instruments
Re: problem with color
yesterday evening i solved my problem , my internet connection was down so couldn't reply you. I manage to find vi. how can i assigned the shads i get to the LED as it's color because LED take array as input to it's color property thanks for reply
Re: labview 7 Beta
LabVIEW default installation is in it's own directory - typically program files\national instruments\LabVIEW 7. If you tell it to install in the same directory as 6.1 (program files\national instruments\LabVIEW 6.1), then it will overwrite everything there.
Re: unload dll
I have a LV application that have some Exit problems. LV hangs. I think the problem is related to unload problems of a dll. Normally the dll is unloaded then the application is closed. Can I programmely unload the dll before i close the application? The best way to do this is to wrap the DLL in a VI. Give it a nice connector, etc. Then dynamically load and unload the VI. Greg McKaskle
failed to launch measurement and automation
I downloaded the Labview 7 Eval and it seems to be missing something. When I click on config on the splash page I get failed to launch measurement and automation explorer, it may not be installed (I've reinstalled 3 times just to make sure... files downloaded from the website). When I open a block diagram, I do not see the DAQ assistant in the menus, and opening the Inst assistant gives me Measurement Automation Explorer or the Instrument IO Assistant is not installed correctly. Please install these from the LabVIEW driver CD. Please advise.
Re: labview 7 Beta
LabVIEW has always been very good in allowing multiple versions installed on the same PC. Just stick to the default installation paths and all will coexist nicely. HOWEVER, be also aware that beta releases bcannot easily coexist/b with other betas or final releases of the same version and special installation or removal instructions might be needed. There might also be other special release notes alerting to bugs, etc. The bofficial release/b of LabVIEW 7 has been out for a while, so there should be no need to install a beta version of it except for historical curiosity. Once the final version is released, the beta license agreement terminates and the purpose of the beta ceases to exist.
Re: Menus and EventStructures
The funny thing is: If I click let's say the item Create new profile this event seems to be produced twice. The first occurence is handled by EventStructure A. EventStructure B which is called after EventStructureA is also configured to handle Menu Selection (User) and it triggers immidiately returning the same ItemTag than StructureA. I can't accept this behaviour. 1. Do I have to consume the first event that it won't be handled a second time by another EventStructure. How could this be done? 2. Maybe there are two events produced. The first when I press the mouse button on the menu entry, the second on releasing. Is this correct. 3. What exactly is MenuTracking and Block menu ? You already have warnings about multiple event structures, but I thought I'd explain what is happening and how you can keep them if you need to. The issue is that you have two event structures that are registered to the menu event. These are apparently implicitly registered, not using dynamic registration, and thus you have two event queues registered. When an event fires, it is duplicated to be placed in every queue that is registered for it. If you don't want all menu events for the panel all the time, you can use dynamic registration to specify when your registration queue is interested in the events, and when it is not. The simpler approach, as others have mentioned, is to question why you have two structures. It is typically possible to collapse them back to one and further simplify things. 1. Each event structure feeds off a registration queue. If implicitly registered, it is a private queue. If using dynamic registration, it is the queue wired to the structure. The queue can be sent to different structures over time and can unregister or reregister for specific events at any time. Events are duplicated and placed on every queue registered for them, and consuming an event from one queue has no affect on other queues. 2. Nope. The Menu Selection event is on menu select, which is always mouse up I believe. The duplicates are due to #1 above. If using Menu Select? events, they take place first and determine if the event is discarded. The Menu Activation happens earlier and allows for the menu to be updated before the user views it. 3. Menu tracking is the term we use to describe the user's interaction with the menu with the mouse or keyboard. If tracking is enabled, the menu responds to the end user, if disabled, it ignores them. Blocking is something introduced before LV had the event structure. It is pretty much the same as the Lock Panel option. It says that while processing this menu item, do not let the user choose another option until you release the block. This is used when the menus will be changed, items inserted, deleted, checked, enabled, or disabled because of this selection. Greg McKaskle
Re: How to add visa usb support to the application builder?
Thank you Jyoti and Rolf for the tips, it's very useful. By the way, do you know if it is possible to separate usb driver (or any other component) from VISA installer? And do you know if it's possible to configure the setup process? I mean following thing: when you enter VISA setup it suggest to install all of it's components. And if you need only usb support you should deselect all other unnecessary drivers. So the question is: can i change default VISA installer settings?
Re: i'm reading value from memory addresses one at a time. How can I store my values in an array?
The bad way: Using a shift register and a build array function node append them to the array. The good way: wiring the value to the loop boundary and enabling autoindexing. Autoindexing is enabled by default on a For Loop, but needs to be enabled on a While Loop. Rolf K
Re: how to read x and y position of curser
I have a graph, Using 2 curser I am fixing two points on a graph I want to calculate slope using these two points. So ,my problem is how to read XY co-ordinates of point, pointed by curser Using a property node, set the active cursor property to the cursor you want to read, then read the property for cursor position. You can also read the cursor list and loop through the array to do this. Greg McKaskle
Re: Any idea how to send stereo 8 bit data to SO write.vi and make it work?
Thanks for the quick response and an accurate answer.
i'm reading value from memory addresses one at a time. How can I store my values in an array?
How can I store values in an array as I read them in from memory?
Would NI consider posting old copies of LabVIEW
I just watched the NI tutorial A Simple Thermocouple Measurement - 1994 and 2004. It shows writing a VI in LabVIEW 7 vs. LabVIEW 3.1. It got me wondering just what the really early versions of LabVIEW were like. Seeing as the early versions were on a handful of floppies, they wouldn't be a big download. I even have an old Mac in storage, so LabVIEW 1.0 would be an option. Anyway, I can't see how releasing the 1.0-3.1 versions as freeware could possibly hurt sales of 7.0. Every year at NIWeek they have old machines running the old software, so NI must have a few copies that are easy to get to. Maybe have the person in charge of that booth add them as a bonus on the 2004 NIWeek CD.
Re: if no screen activity happens for a predefined time show dialog
That depends upon how your LabVIEW program is written. Some of mine run in loops: Check the inputs / do something / wait 250ms / repeat I can easily put a counter in that: 4 loops/sec * 60 sec/minute * 5 minutes. Reset the counter if a change (input) occurs. Run lock/login if counter hits the 5 minute limit. Is there room for that in your program? [EMAIL PROTECTED]
Re: PCI-6601 for limit switches.
Hello Brooks, You are right. I would need a mechanical relay to make those connections. However, I would still like to control those relays using labview, and the connecting criteria of the lines remain the same. I am going to get the relays today, and i am wondering what blocks in labview I can use to send signals to the relay. If you need more info to be able to help, please let me know. Thanks.
How to trigger an action when OK button in Dialog Box is clicked
In my program I collect data from analog inputs and store that in a binary file. My problem is I need to trigger another action when ever the user gives the file name to store the data and clicks the OK Button inside the Dialog box. Is there any way I can get the boolean signal when ever the OK button is pressed?
Re: HTML printing in Labview running Sun Solaris
We are creating html test data files in labview and would like to print them on the Sun Solaris. Labview for Solaris can print the files but just prints the source code (doesn't format the code into nice tables, etc). You can also print the front panel but it resizes all the data to one page (very small and not easily modified). Currently we have to manually open a browser (i.e. hotjava) and then print the files. I haven't played with it, but you should be able to invoke your browser via the System Exec command line tool. Put the html file on the command line and it should load it. I'd hope there is an option telling it to print or just print without opening windows. You'll have to look in the apps help or get someone's input more familiar with that browser under solaris. Greg McKaskle
Re: TI PCI-2040
Programming hardware is NOT the task of an application, and LabVIEW is an application running in user space. Trying to do that right away will cause a General Protection Fault error on any reasonably modern OS. You can of course try to access Port IO addresses through the Port IO VIs, but PCI bus addresses are not anymore fixed and need access to privileged OS services to resolve properly. Otherwise if you start to use fixed addresses for this using Port IO access, it will most probably only work on a particular computer and may even fail next time you restart your computer or resume from standby with a different PCMCIA or whatever card inserted. These are all things only a device driver can do properly and so if you want to access hardware behind a PCI bridge, you really have to develop a device driver for this hardware to work under any Windows NT type, Linux or OS X system. The PCI bridge on the system board is not really programmed by you anyhow but by the OS which provides you with services to make use of the hardware. Fortunately developing a device driver only requires advanced C knowledge nowadays, it used to require also profound assembly language knowledge only a few years ago. Rolf K
Re: Feature request and how-to info for EXE icons
I took a look at this. The actual functions doing the icon work in the application builder seem to be called by reference from vi.lib\platform\icon.llb\Read Icons From ICO File.vi and Write Icons To Application.vi. One problem is that even though the read VI does read all types of icon formats, the write does only overwrite existing icon formats in the resource fork of the executable and that contains currently only those four images. So I would believe by adding the other resource types you would like to the applibs/lvapp.lib file (which really is an executable to startup the LabVIEW runtime engine and is used to create the actual exectuable file) you could get the Application Builder to replace those resources with the ones from your icon file. There is a problem though and it is not very simple. If your icon file does not contain certain icon types the old ones will stay in and might be picked up. Removing them or adding new icon types not in the original file requiures to resize the entire executable and fixup quite some offsets in the resource table for this. There are some Win API functions which are supposed to help with that, but I'm not really familiar with them. Rolf K
Re: Looking at drwatson logfile, can you tell me why my app crashed?
time as the last entry in the data file the test was producing. Does anyone at National Instruments know how to use the drwatson log file to discover the direct cause of the crash? Unfortunately, there isn't as much information there as it might seem. There is a stack frame for the thread that crashed, and in fact that points to something other than diagram code since LV diagrams execute without the stack and have the stack register setup to something else. I'd recommend running the same VIs in the LV editor and seeing if it is reproduceable. If so, you can set breakpoints at various points, turn on execution hiliting for VIs, put in probes, etc. The first place I'd recommend you look is at any DLL calls. Since the stack was setup, it looks like you might have been in either a LV callback into the runtime engine or in a DLL called from the diagram. Hopefully you can track it down to a particular DLL call either crashing immediately or corrupting memory. Greg McKaskle
Re: Chromatogram generator
Shenz wrote: Hello, I want to create a signal generator that creates signals equal to these from HPLC chromatograms (examples can be found at http://www.cobertassoc.com/hpgrams.htm). Can anybody give me directions of what the best way is to do this? Thanks a lot! Egwin Use an arbitrary waveform generator card with the MAX scripting capability.
if no screen activity happens for a predefined time show dialog
Hi I need to lock my screen, ie bring up a login screen if my vi has been left with no activity for a predefined time(say 5 mins). How do I do this? I have considered the wait for front panel activity but i am not really too sure how to work this. Any help gratefully accepted Alexi
Crash when passing a pointer of an initialized U8 array to my dll file.
I need to pass the pointer of an initialized 1D array of U8 type to my Dll file. At first, I set the length of the 1D array and initialized it. Then I configured the Call Lib Node and made the input parameter as 1D Array Pointer of U8 type. The prototype of the called function in my Dll file is: EXPORT void Grab(unsigned char *LVPict) Also, I had a goble pointer of 1D buffer in my Dll file, defined as LPBYTE pImage, and I wrote the data in the goble buffer to the 1D array, using for (DWORD i=0; idwSize; i++) LVPict[i]=pImage[i]; But after I run the VI, LabView crashed down every time until I reduced dwSize, the legth of buffer, to 1. That means, I can not write anything from the buffer to the array. I'm very very sure the array initialized in LabView is far far huge than the goble buffer.
Re: How to apply 1/3 octave bandpass filter of about 10Khz on a signal
Can you post a simple example program?
Remote monitoring and control of a Labview program
I would like to control and monitor my robot program written in LV version 6.1. It runs inside a professional firewall at my company. I need to see and control the main VI and any other VI's that may pop up on the target machine from my home PC. Can this be done in a secure way? PS: I only know my own IP address, the target IP address is probably not available to me due to firewall protection. Also I am not expert in TCP/IP protocol.
Re: problem with color
I had use color to RGB vi, and find it's RGB component I am more interested in starting with a color and move it towards black or white I was unable to do it. can you tell how to achieve it, Can I use color ramp for this If yes then how to use it. if possible send example vi As I said, there is a VI in the picture palette, near the Color to RGB that returns the hilite and shadow of a color. You can repeatedly call this VI passing in a percentage, or you can look at its diagram. Greg McKaskle
labview 7 Beta
Can I install LabVIEW 7 Beta onto the same directory as LabVIEW 6.1 that I already have?
Re: Is it possible to programmatically set the size and names of...
What you are asking to do is not possible with the present release of LabVIEW. As Dennis points out, there are some unreleased features that might do what you want. You can learn about them on the LAVA forum but to find exactly what you need may require a lot of patience if it even exists.
Re: PCI-6601 for limit switches.
Hello: I am sorry but I need more information to provide a good response. The PCi-6601 board you have can output TTL 5 V or 0 V signals (but not drive much current) or be used for counter operations. According to your explanation and the JPG of the limit switches, it looks to me like you need switch or relay module to connect / disconnect different pins - is this correct? This board will not work as a relay. Please let me know exactly what you are trying to do in terms of what signals, what connections, etc and maybe I can help you out or suggest a more appropriate piece of hardware for you. Sincerely, Brooks B Applications Engineer National Instruments
Re: problem with color
thanks for ans.
Re: sound generator application crashes
kevinm, I have reproduced this behaviour with your reduced application. The problem has been reported for investigation. I will inform you about the status or the solution on Tuesday 20. Arkadiusz Roszczewski National Instruments
HTML printing in Labview running Sun Solaris
We are creating html test data files in labview and would like to print them on the Sun Solaris. Labview for Solaris can print the files but just prints the source code (doesn't format the code into nice tables, etc). You can also print the front panel but it resizes all the data to one page (very small and not easily modified). Currently we have to manually open a browser (i.e. hotjava) and then print the files. Thanks in advance for any help.
Re: How to trigger an action when OK button in Dialog Box is clicked
You can't get the OK Pressed directly, but you can check the error output. An error code 43 is generated when a user hits cancel in the dialog box. If you're using a vi from the File I/O pallet (like Write to SGL File), they unfortunately don't have the error cluster wired as an output. They do have an output of the selected path. This is set to Not A Path if the user selects Cancel. Test the output path - if it is equal to the Not A Path constant, then the user hit cancel. Tim
Re: Remote monitoring and control of a Labview program
Thank you Teccor. I have not yet studied your links but I did save them from the title's I can see you obviously have given me some very good tips! I will try your suggestions Thanks again
how to read x and y position of curser
I have a graph, Using 2 curser I am fixing two points on a graph I want to calculate slope using these two points. So ,my problem is how to read XY co-ordinates of point, pointed by curser
Re: if no screen activity happens for a predefined time show dialog
Questions about Labview don't belong on the Labview Discussion Forum? Exactly what do you think this is for? If the best you can come up with is to suggest ... try experimenting with LabVIEW ..., may I suggest you leave the answers to people who are interested in helping out.
Re: Crash when passing a pointer of an initialized U8 array to my
I need to pass the pointer of an initialized 1D array of U8 type to my Dll file. At first, I set the length of the 1D array and initialized it. Then I configured the Call Lib Node and made the input parameter as 1D Array Pointer of U8 type. The prototype of the called function in my Dll file is: It sounds like you are doing things correctly, but this is pretty unforgiving stuff. My advice would be to initialize the 1D array of U8s in LV to something you can recognize when debugging the DLL. Either make the entire array be your favorite integer, like 255, or make it a pattern like a ramp going from 0 to 255. Then set a breakpoint at your loop and look at the memory pointed to by the array. One thing I've seen happen before is to use the initialize array node giving two integers -- which is the size and which the data -- oops, other way around. Anyway, this will let you see what you are being passed and you can watch where the DLL is writing. Once you have some more info about how it is behaving, you can post back if you still don't know what is causing it. Greg McKaskle
Re: How to apply 1/3 octave bandpass filter of about 10Khz on a signal
Hello Pavitra, The Sound and Vibration Toolset has many powerful tools for octave analysis. Please refer to chapter 8 of the a href=http://digital.ni.com/manuals.nsf/webAdvsearch/C31B0809E0EE1934862567B5004F30F6?OpenDocumentvid=niwcnode=132100_US;Sound and Vibration Toolset Reference Manual/a for more information on these VIs. Sincerely, Jyoti F National Instruments
Re: Complex data structure.
of the cluster. My question is - what do you use in these situations? Of course, I always typedef my complex structures, and I know that there is a default value for them, because other language features depend on there being a default. Is there anyway to get the default value for a typedef? Not seeing one, I have taken to creating a Global or Dummy VI for each typedef that returns a default data structure, which is what I use in all these situations. What other approaches have you seen? You can right click on a wire or terminal and create a constant for the type already there. This will sometimes fool you if you are wanting the input to a shift register since the types flow downstream and you want upstream. Just click somewhere where the type is known, create the const and move it where you want it. The BIG downside to this is that typedef constants tend to be BIG. My favorite solution is to make a subVI that returns the default for the typedef. Put it in user.lib and it is readily accessible. You can think of it as a constructor for your datatype, if you want. In fact you can make several of these or parameterize it to return different flavors. Being the size of all other icons, it fits nicely into the diagram and adapts to typedef changes. Greg McKaskle
Re: TRANSFORM A TEXT FROM TXT FILE
Please, can you send another time your vi? I can't charge it with my labview, my computer said: there was an error. Perphaps the problem is that my labview is 5.1 version. Thanks a lot. IMMA
Re: Reference Trigger. Continuous Acquisition. Is it possible with a PXI-4472?
Giulia, yes, that is exactly what we mean. The way to implement this depends on what version of LabVIEW you are working with. If you are working on LV 7, then there is a good library of functions called Signal Manipulation that would allow you to easily handle and work with your data once they have been acquired. Basically you should go through your scans and check when the trigger has come in. Depending on the position of the transition (from 0 to 5 V I guess) you can roll back N samples and save those N + M samples you are interested in (being N the number of pretrigger samples and M the number of posttrigger samples). I think it would be best if you call directly by phone one of our Engineers at NI Italy and discuss the problem directly with us. AlessioD National Instruments
Re: labview 7 Beta
When LabVIEW 7 was in Beta, you could install it on the same pc with 6.1. I'm not sure you can still install the Beta version however, as the Beta period expired when it was released last year.
Re: How to apply 1/3 octave bandpass filter of about 10Khz on a signal
There is a toolkit for octave analysis. a href=http://sine.ni.com/apps/we/nioc.vp?cid=3122lang=US;NI LabVIEW Sound and Vibration Toolset/a
