When using events in labview, only the labview application is
monitored for any sort of activity. Which means if the labview
application window is not in focus there will be no effect.
There is a Windows API Toolkit (written in LabView) you can use to
monitor any keyboard activity (regardless
Oops - don't you just hate it when you get halfway through a reply and
hit the wrong key. Sorry.
In terms of locking the screen, you'll need to interface with the
microsoft Windows SDK (the .dll's inside of Windows itself) to get the
lock screen like that. Have a look on the internet in general if
It really depends on what version of office you are using. Some
methods have different set of parameters or even different names,
labview does not adjust them accordingly, even though the code might
execute but it will fail during build process. You must reselect the
methods manually in order to
For labview 6.0 I have not been able to find or make a program which
takes already obtained data and is able to rerun that data saved in
excel into a waveform chart or graph. Is there an example that I
could use for this?
Another way is to use the Decimate 1D Array.
-Joe
Hallo,
The Configuration File VI's create a text based file which I can also edit
with an text editor.
I want to insert comment lines into such a file manually. Can I do this?
If yes, how can I mark them as comment lines
(maybe like /*This is a comment*/ as in C)
Thank you
Oliver Friedrich
I would like to choose the information saved on the header. Moreover,
headers are perfect if file saved are .lvm and opened with Notepad,
but they are not easy to read and interpret when written as.xls in
order to open file with Excel and try data operations.
N.B. What I do to choose the type of
I have two vi's. In the first VI I want to make configurations and
after that I want to start an second VI out of the first VI with an
simple OK Button.
I need help in placing text, controls and indicators so that they
float on top of Tab Controlled windows. Some components already do
this but others seem to attach themselves to a Tab layer. There
appears to be an unwritten convention here, that may be part of an IQ
test which I am failing, that
If you drag anything into a tab control, that object becomes part of a
page. If you first place the object outside the tab and then move it
using the cursor keys, that object is not part of a page but will
appear on all pages. You will see some weird shadows when you do this.
One one to avoid that
The easiest way to do that is to use the event structure (7.0). and
edit the events of the structure to handle the OK button. If you do
not have a version of labview that has the event structure capability,
then you can use a statemachine. Look at the examples for further
info. I'll try to attach
-Original Message-
From: Brett Scott [mailto:[EMAIL PROTECTED]
Sent: Friday, 16 April 2004 7:50 PM
To: Info-Labview
Subject: datataker dt50 Labview
Hi everyone
Has anybody here any experience or used any of the datataker in particular
the dt50 Range of DAQ boards /boxs . I am simply
Thank you John.
I will give this a try.
Van
This is not so bizarre. LabVIEW icons are internally really Macintosh
resources and there is some translation necessary to get them into
Windows format. Also by being able to convert the icon alone you are
still not there. Putting them into the target executable is a little
tricky at best.
Rolf K
Oliver Friedrich wrote:
Hallo,
The Configuration File VI's create a text based file which I can also edit
with an text editor.
I want to insert comment lines into such a file manually. Can I do this?
If yes, how can I mark them as comment lines
(maybe like /*This is a comment*/ as in
Without a block diagram, you cannot open a VI in a newer version
because the block diagram is required for the recompile. The only way
to upgrade is to find the original VIs with the source code. No one,
NI included, can recover a block diagram once it has been deleted.
Sorry about that, the site has been saying it's down for maintenance
when I try to attach the files, I have been checking since Friday and
it still isn't working ... is there something else I should try to get
you these files?
I am tyring to produce a power spectrum graph for a Tachogram data,
related to Heart Rate Variability Analysis. This data can be thought
to be as a random signal, but has a frequency spectrum range of 0 -
1HZ.
The problem that I am facing is, I am getting very high values for
very low frequency
Use Image Toolbox / Read Image File.vi. Take a look this web page:
http://www.geocities.com/gzou999/imgtool.htm
George Zou
http://gtoolbox.yeah.net
As mentioned on our web site, the download version does not include
all of our drivers. You can request the CD version of the evaluation
software a
href=https://sine.ni.com/apps/we/nigb.main?code=GB_LVEVAL;here/a,
and it includes the driver CD.
Alternatively, the latest versions of many of our
Thank you both for your helpful replies. I eliminated the shadows by
bringing in the objects with a back drop. The remaining problem is
placement consistency as various Tabs are selected i.e. there are four
FFT Graphs which are, unfortunately, of slightly different size and
position. Is there a
The array is up to 4 (FG color, BG color) pairs. Color pairs include
False, True, True to False, and False to True. Each pair is a cluster
of two colors. You can then make an array of up to 4 clusters that
refer to the four cases listed above.
Hope this helps!
AllenP
Applications Engineer
Thanks Rolfk.
I will give this a try.
Van
I'm using a 6052E with LabView6.1. I need to simultaneously trigger
two devices. The first is to send a trigger signal to another LabView
program via Trig1 to tell it to begin collecting data. I can't modify
that progam. The second is a TTL pulse to another device. This pulse
needs to be between
Irene,
I just wanted to re-iterate the other postings. You can have multiple
release versions of LabVIEW on the same PC, however they all must be
in separate directories.
But more importantly; remember that the beta agreement states that you
can not use the beta versions of our software for
If you can change both application, consider using datasocket. It is
much easier and very reliable as well. In the VB application, add
datasocket activeX control to use it, not only you can read data in
labview application, you can update data as well.
-Joe
What is your sample rate, how long is your measurement time and what
window are you using? These are just few questions that would need
answers in order to help tracking your problem.
So it could be very helpful if you could post your VI with the actual
input data you are analyzing (saved as
Thanks v much for your help, I now managed to figure it out.
I am very grateful to everyone who has helped me so far, I am not a
programmer and do find it difficult to get to grips with some LV
functionality, but this forum has greatly helped me to develop, not
only by my own questions being
What are the differences between the academic and the regular versions
of LabView?
Hello:
Please try out the example Write 1 Pt to Dig Line (E).vi which can
be found using the LabVIEW example finder. You use the DIO VIs
located on your DAQ palette.
Good Luck!
Sincerely,
Brooks B
Hi,
LabVIEW will only look in certain directories for VIs. It sounds like
the source code control program that you are using could be moving the
VIs to another directory. You can change this information under Tools
Preferences Paths. I would suggest adding the directory that
your VIs are
You can import gif image into labview, however, there are no VIs
provided by NI to read GIF files because of patent. If you want to
display gifs in picture control then you can find some comercial VIs.
To import it, goto Edit - Import Image from File and select a Gif
file, then use Paste to
Post any time you want. There are probably 20 lurkers out there who
would like to know the answer too, but are too shy to ask.
Les
Does anyone have a driver for a Watlow 96 controller. I found a reference to
Watlow96.llb in the Info Archives, but have not found the library anywhere.
Thanks,
Wayne Lewis
Blue Ridge Test
Forest, VA
Work (434)525-7312
.BlueRidgeTest.com
Thanks for responding to my question. The annwer for your questions
are: Measurment time : 300seconds, Sampling Frequency : 2 Hertz, and
Window Type : Hanning. Hope you could hint me on this soon.
Thanks for responding to my question. The annwer for your questions
are: Measurment time :
--446938.1082401701043.JavaMail.quiq.tekken
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Your second question is not quite clear. Are you talking about
generating a ramp of consecutive integers?
The attached image shows a quick solution for that.
Hello, I would like to generate a pulse train that has a coulpe cycles
from high to low, then remains low for awhile, and repeats the
sequence. Here is a little ascii waveform of what I want to do:
_ _ _ _
_| |__| |__|
Bei der Installation von LabView 7 Express free 30-day Evaluation
Software unter XP Pro bekomme ich folgende Fehlermeldung:The Windows
Installer Service could not be accessed. Error: The system cannot find
the path specified.
Auch das empfohlene Neustarten und neue Ausf=FChren der setup.exe war
Thanks for responding. I don't know anything about LabView, but I'm
involved in a project that uses LabView for data acquisition and I'd
like to know a bit more about how it works. That qualifies as
personal education :-)
My question ought to have been phrased as Will the academic/student
Hey Nitim,
If you choose to download the driver off our website then here's the
link to our driver versions page.
a href = http://www.ni.com/support/daq/versions.htm NI-DAQ Driver
Support for Windows /a
This page allows you to quickly find the latest version of the driver
that your board supports
It's on an internal network and I'm just testing out creating
services. Current properties on the CookieService are:
+*
I will go back and attempt to add specific flavors there and see if it
recognizes things.
Well... maybe we shouldn't blame the Dell PC just yet!!
Did you get that message when selecting, copying a Case Statement and
pasting it into a brand new vi? Then trying to run the vi from which
it originated before saving or changing the new one? (although you may
have changed the original
Need to learn how to use Windows Media Player 9 in Labview 6.1 and 7.
Are you calling a C/C++ function directly from within a vi? Are you
using a Call Library Function Node?
JLV
Again that would help if we could see the actual data and results.
Your frequency resolution is 1/300 Hz so when you say your problem is
near dc how near is it? only around the first bin? the first few
bins? Is there a sharp transition between the problem region and the
rest of your spectrum.
Well, you can always get a free evaluation copy of LabVIEW. It runs
for a month (I think).
Most of code is compatible between regular and student version. (See
the a href=http://www.ni.com/labviewse/labviewse_faq.htmFAQ/a).
There are probably some limitations with respect to to use of external
tell me what you would like to do with it and I will help you. Do a
search on activeX in the examples and you will find how to do it with
activeX.
Joe
Hi,
I have a one dimensional array which has n numbers in it. Now I need
to write this array data to a text file.
In the textfile the first line should be I1.
The second line should be NODES.
The third line should be the number of numbers in the array say n.
And the fourth line should have all
ok, I see you posted parts of your VI in a different location. There
is a sub-VI missing though ( Spline Interpolate.vi). But I
re-constructed your data and can see the following things:
1 - Your signal has a significant DC-offset (approximatelly 1000) and
this will result in a power value for DC
==
subscriptions to info-lv are on hold so Alex asked me to send this on his behalf.
==
Dear List,
As many of you know, I have been the editor of the Info-LabVIEW FAQ since it's
inception in 1999. While I was with ICON
Technologies, ICON provided the web space and resources to host the
==
subscriptions to info-lv are on hold so Alex asked me to send this on his behalf.
==
Dear List,
As many of you know, I have been the editor of the Info-LabVIEW FAQ since it's
inception in 1999. While I was with ICON
Technologies, ICON provided the web space and resources to host the
As we informed you awhile ago, the Info-LabVIEW is moving. We hope that this will be
accomplished with very little disruption. The new list is up and functioning and all
the addresses have been transferred.
1. Announce the new email addresses and activate the lists at FSU. That should
be
I am trying to use the VerQueryValue function in Version.DLL through a
code interface node.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/Resources/VersionInformation/VersionInformationReference/VersionInformationFunctions/VerQueryValue.asp
First of all, could you try not to create a new posting for every
answer. Just reply by pressing either the Answer this Question or
the Comment this Answer button. Otherwise this discussion thread
will end all over the place making it difficult to keep track of its
progresses.
So to answer this
localDSP, you suggested removing the DC componet from the signal and
then apply fft on it. How do I extract the DC component from the
signal without affecting it.
How would I excatly know this is my DC value and then
edit my random data according to it. Your suggestion would be well
appreciated.
I really appreciate you taking the time to answer my questions,
localDSP. Too bad, I have to go with this nick.
Why do you say But overall there is not much signal left once you
remove your DC and eventually the very low frequency signal. DC just
brings a shift to the analog signal, and it
Hello:
The 8253 counter chip is a 16-bit chip which means it reaches its
terminal count (max count) at 2^16 - 1 = 65535. So, if you are
counting pulses at a rate of 100 kHz then it will roll over in about
0.66 seconds - I understand your problem!
We have several examples for cascading two of
Since your signal contains a lot of DC (approx. value = 1000), you may
consider removing some of it before computing your Power Spectrum. The
problem is to figure out what the exact dc value is and make sure you
do not remove part of the interesting signal. Unfortunately in your
case, as I
I guess when saying Code Interface Node above, you really mean the
Call Library Node. Because if you had a CIN you had some C code to
write and in there you could do whatever you wanted.
As I have pointed out at other places here you could use a little
LabVIEW voodoo to get at this information.
Chris,
The MSI Error implies that the Microsoft Installer(MSI) Engine
crashed. This is the software that handles all installation and
uninstallation on your computer.
I am assuming you are using Windows 2000. If so you can download and
install the MSI engine from Microsoft a
I got to point out something here. The vertical axis unit for the time
domain signal is milliseconds,and not volts. I am a bit lost here,
would the term DC apply to our case here ? Let's we call it the DC
offset, can't we remove it by taking the mean of the raw data and then
subtracting the values
Well DC was the term used under the assumption that it is an
amplitude y-axis (DC = Direct Courant). It may not be the correct term
to use if the y-axis is in ms but as you say let's just call that
dc.
Yes you can remove the dc by subtracting the mean value but by doing
this you define your dc to
I would like to Thank you all and special thanks to Peter.
Hi,
I am a beginner in labview. I am trying to use case structure to reset
an output number (basically, if the output is greater than 360,
subtract 360 from it and display the remainder). I checked the help
section for case structures, but couldn't figure out. I know this is
very simple task, but
We have been asked to repeat the NIWeek session -- The Good, the Bad,
and the Ugly.
Basically it is the review and attempted improvement of LV diagram code
by a member of the LV development team. The presentation is typically a
slide or two of overview for an application, then jumping into LV
We have been asked to repeat the NIWeek session -- The Good, the Bad,
and the Ugly.
Basically it is the review and attempted improvement of LV diagram code
by a member of the LV development team. The presentation is typically a
slide or two of overview for an application, then jumping into LV
We have seen some strange problems when the aplication was not built on
the
same platform. Was the application built on a WIN2K machine? If not, I
would suggest that you try that among the first things.
Honestly, there is only one version of LV for Windows, and it will
produce exactly the
this is really unfair from national as VIs can migrate from one platform
to another
and embedding VIs in multiples standalone engine (one for each
platform) should be quite easy to do.
VIs are source code. Exes are a produced image of the source code.
While it wasn't easy making platform
Is it just me
or is this the most hideous, haphazard ragbag since the invention of the
Windows toolbar? I counted *at least twelve* different styles of xy graph
in
this collection of supposedly 'consistent' symbols.
While it is always good to get feedback, it is even better to get
Sorry to do this twice, but I forgot to change the Subject.
We have been asked to repeat the NIWeek session -- The Good, the Bad,
and the Ugly.
Basically it is the review and attempted improvement of LV diagram code
by a member of the LV development team. The presentation is typically a
What is the name of this control (???.ocx) and where is it normally
found
thx
Wow! What a product, check out this card and price $2,995.00 model 7041.
Getting some awesome analog sampling, analysis and real-time response code
working on this card.
Jack Hamilton
Hamilton Design
[EMAIL PROTECTED]
www.Labuseful.com
714-839-6375 Office
Its ok now, i FINALLY found the vi.llb directory and added the
addons\_office\ _wordsub.llb and _exclsub.llb as instructed from the
readme.rtf file in that directory (Add as Dynamic VI in Build Source
Files)
Don't know why it was so complicated to find this though!
Himes, Allen [EMAIL PROTECTED] wrote:
Thanks to the guys that offered suggestions. I forgot to mention that
the application from where I need to grab data is a .exe. The methods
suggested only worked (or I couldn't make them work, anyway) for a
regular VI and not an .exe. What I initially
Infos - Bien Entendu [EMAIL PROTECTED]
this is really unfair from national as VIs can migrate from one platform
to another and embedding VIs in multiples standalone engine (one for
each platform) should be quite easy to do.
Well it has economical as well as technical reasons. First integrating
Hi everyone
I try to find a way of subtracting two hours. I have a starting hour and an
ending one and I would like to take out the delta hours
I get hours from the Get Date/Time String vi and wonder if it's possible to
convert a string data to a number data and then find the difference.
Thanks
From: Greg McKaskle [EMAIL PROTECTED]
Date: Mon, 19 Apr 2004 22:04:03 -0500
To: [EMAIL PROTECTED]
Subject: Re: appbuilder
[skipped]
Of course if you want
to buy Virtual PC and LV for Windows, then it really is easy, and fair.
Big warning regarding VirtualPC (up to 6.1). The floating
i downloaded the driver (LabVIEW) for the multiplexer (MUX 3499B)but i
do'nt know how i can define my connector in this programm und i do'nt
understand what means instrument Handle in or out in this
programm.
i would happy if somebody can help me.
HI!
My problem was in low and upper cut of frequencies. When I set them so
that they crossed for example: lower 50 Hz and upper 49 Hz, the
problem occur. When I set the program so that the limits can't cros
-- everything works fine.
Neuvos
Jed Davidow [mailto:[EMAIL PROTECTED] wrote:
Is there a way to set windows permissions thru labview on
XP/2000? I'm not talking about the simple rwx file flags,
but actual windowsNT security settings.
Has anyone written a library that uses the SDK, or is there
a command line hack/script
You should use get time/date in seconds from the String and Dialog
Palette. Have an initial one outside the loop and one inside, then
subtract the the two after you stop the loop. This will give you the
difference in secs which you can convert to hours.
Hello!
I have the same requierement today (April 2004) have you solved the
problem?
Thank you for getting in touch
Best regards
Jean-Bernard
Hello,
To download the driver, you should pass by the technical support of
Alliance VISION.
So, in the web site, go to Support technique and click on Ask
question. There, you can ask the engineers to provide you the driver
of your device.
Sanaa TAZI
Application Engineer
National Instruments
Hello Behzad,
I'm no expert but quite experienced with LabIEW features.First, is
that running remote panels is possible only for version 6.1 and
7.0.For you to run remote panels successfully (which I did in our lab
with five remote panels sharing a motorized microscope) you must see
to it both
Hi, everybody
Our company's busines/economy system is accessible via web services. Is it possible to
use web services in Labview? Do you know if there are any resources (books, web pages
etc.) where I can learn about web services and specifically how to use them in Labview?
Andreas Nilsson,
Bonjour,
restait il suffisament de m=E9moire disponible sur le disque au moment
o=F9 l'erreur s'est produite?
Quand vous parlez de temps ind=E9termin=E9, est ce un temps relativement
long ou le probl=E8me peut se produire tr=E8s rapidement.
Avez-vous de nouveau =E9t=E9 confront=E9 =E0 la m=EAme
Bonjour,
Le VI Counter start trigger vous permet de configurer un trigger
(d=E9clenchement) pour votre carte. Dans les sp=E9cifications de votre
trigger, il vous faut choisir sur quelle ligne (PFI ou RTSI) votre
signal de d=E9clenchement est connect=E9.
Les broches des lignes PFI sont
I've purchased an RF transmitter and receiver with the RS-232
interface to control a remote control device from my laptop. I need to
send PWM (pulse width modulated signals) to the reciver to control
some servos. All examples I have seen only involve DIO cards. Is it
possible for LabVIEW to send a
- Il rester 15 Go libre sur disque...
- Je n'ai eu le probl=E9me qu'une fois ... apr=E9s 4 =E0 5 h de
fonctionnement ...
- Je n'ai pas reformat=E9 le PC...
- Je n'ai pas reussi =E0 reproquer l'erreur sur ce PC ... ni sur un
autre (j'ai laiss=E9 tourner l'application tous ce week-end ...
I am developing an application to detect rolling element bearing
defects, for that I need to do envelope spectral analysis on the time
domain data, this envelope analysis is to be done in 1/3 octave band
of 10KHz. how do i do this in labview
[EMAIL PROTECTED]; Forum LabView
i agree that building a cross compiler wouldn't be so easy to
do and not a profitable option
But having to pay for a whole development system is really
expensive as
you already bought it for another platform
why not just selling an application builder as
Thanks David for your reply but how to substract the two strings, has you
mentionned? that 's where I can't find the answer.
I can't use the normal substract vi it gives me error and I don't find the
right vi to convert string should this be necessary
Thanks again
Gerard
--
Gérard Férini
Hi Ninskaya,
if you are using LabVIEW versio 6.1 or higher and NI-FGEN 2.1 you
could use the following example:
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B53A24EA9791426CE034080020E74861p_node=DZ52290p_source=External
THis is the only way to solve your problem, because
Hi,
I suggest you use AI Config and then AI Start (placing a 0 for the
input # of scans to read - means continuous acquisition) out of your
while loop. In your while loop use the VI called AI Buffer Read. Don't
forget to use the AI Clear vi when your program finishes.
Hope this helps !
Julien
What I believe you want to do is a retriggerable pulse train
generation (this is assuming the pulse is a consistent frequency/duty
cycle when on). There is a DAQmx example called multi-function Ctr
Retrigg Pulse Train Generation for AI Sample clock which should give
you a good starting point
Hi Peter,
Thanks a lot for your help. I will use that vi.
Ninskaya
In Labview, it is under Communication - Datasocket. In VB, I
believe it is called something like Datasocket . In Labview, goto
Help - Find Examples and search for datasocket, there should be
some examples.
-Joe
How to draw an angle on XY graph
I think if we use multiple plot =E0
1.We have to first draw base line. As plot1
2.select a point on plot 1 using cursor
3.At this selected point , with respect to base line(ie plot 1)
we must draw an angle (this line can be part of plot2)
This is what I am
How to draw an angle on XY graph
I think if we use multiple plot =E0
1.We have to first draw base line. As plot1
2.select a point on plot 1 using cursor
3.At this selected point , with respect to base line(ie plot 1)
we must draw an angle (this line can be part of plot2)
This is what I am
I have a video camera which plugs into my PCI TV card and I would like
to view the video on a VI front panel. How do I communicate with a PCI
card? I am using LabVIEW 6.1
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