Beginner question on labview and transducer

i'm trying to understand what a transducer does and what labview can do
to it.
are these assumption correct?
1) with labview, i can change the frequency of sound waves emitted from
a ultrasonic transducer. if i want maximum amplitude of the sound wave
(loudness), i would set the transducer to its internal resonant
frequency (1 mHz) with labview. if i set the transducer to any other
frequency with labview, i would not get max amplitude.
2) input power of the transducer is 100 W which is the max amount of
power i can supply to the transducer. the more power i supply the
higher the amplitude of the sound wave (with 100 W the maximum power the
transducer can handle) regardless of the resonant frequency. Resonan
t
frequncy and the amount of input combined both effect the amplitude of
the sound waves.
3) can labview change the resonant frequcy and amount of input power to
the transducer by itself by simply clicking a switch or turning a dial
on the labview front panel?
4) any good books to help me write a labview GUI for a ultrasonic
transducer to measure the distance traveled and the time taken of a
reflected sound wave in water?
5) what is beamwidth (3 degree) and depth rating (100 m) of a
transducer?
thanks

[email protected] wrote:
> i'm trying to understand what a transducer does and what labview can do
> to it.
A transducer by definition changes one form of energy into another.
Typically it turns some sort of input to a voltage (a microphone
changes sound waves to a voltage) or it changes a voltage
to some form of output (a speaker changes voltage to sound waves).
I am not familiar with the transducer you are using but I will try to work
using
some assumptions and my used brain.
>
> are these assumption correct?
> 1) with labview, i can change the frequency of sound waves emitted from
> a ultrasonic transducer. if i want maximum amplitude of the sound wave
> (loudness), i would set the transducer to its internal resonant
> frequency (1 mHz) with labview. if i set the transducer to any other
> frequency with labview, i would not get max amplitude.
Can not say since I have no idea how your transducer works.
But this sounds reasonable
>
>
> 2) input power of the transducer is 100 W which is the max amount of
> power i can supply to the transducer. the more power i supply the
> higher the amplitude of the sound wave (with 100 W the maximum power the
>
> transducer can handle) regardless of the resonant frequency. Resonant
> frequncy and the amount of input combined both effect the amplitude of
> the sound waves.
Again dont know but this sounds reasonable.
>
>
> 3) can labview change the resonant frequcy and amount of input power to
> the transducer by itself by simply clicking a switch or turning a dial
> on the labview front panel?
Not by itself since LabView is software, you will need some sort of hardware
to connect to the transducer and Labview to control that hardware
>
>
> 4) any good books to help me write a labview GUI for a ultrasonic
> transducer to measure the distance traveled and the time taken of a
> reflected sound wave in water?
>
> 5) what is beamwidth (3 degree) and depth rating (100 m) of a
> transducer?
> thanks
Consider a flashlight. Turn it on and point it at the wall. The size of the
spot it makes
is its beamwidth (or maybe half of that). It is measured in degrees because
it is defined
as the angle between the center and the edge.
I am not sure about the depth rating. Since you are talking about water this
may be
how far down you can put it.
It sounds to me that you will need a few pieces of hardware to accomplish
your task.
1) Some sort of Digital Acquisition board (DAQ) NI makes several.
2) Some sort of amplifier to get the 100W of power.
3) A PC and Labview to tie it all together.
I cant help you with the hardware (maybe some one else here can.) If you
need help
with the Labview portion, this is a good place to ask.
Hope this was in some small way helpful.
Kevin Kent

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LabVIEW and custom controls

Hi all,
I'm an italian PhD student working with Polytechnic of Bari.
I'd like to submit to this forum a question about LabVIEW and custom controls in form of ActiveX components.
Some introductory word about my problem will be helpful: in the past few months here at Polytechnic of Bari my colleagues and I developed some useful ActiveX controls with custom functionalities to use in LabVIEW.
For example we developed a "contraves", an
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However we are experimenting some difficulties with the integration of these controls in LabVIEW; the controls are correctly imported in our VIs with using the ActiveX Container but...
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Please, do someone of you know if (and eventually how) is it possible to integrate more deeply the controls in the LabVIEW environment?
Do someone of you know if it exist an hypothetical "Custom Controls SDK" for LabVIEW more advanced of that integrated in LabVIEW 6.0?
Any hint would be appreciated.

> Please can you specify in more detail how I can obtain the ActiveX
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>
The first step is to build a VI that contains the panel and diagram
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Hope that helps.
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Beginner question regarding 32-bit mixing and mixdown workflow

Hello
I have a beginner question regarding 32-bit mixing and mixdown.
If I edit some 16Bit, 44.1kHz Stereo WAV Files and put them into multi-track view to do crossfades, how should I do the mixdown?
Audition shows me in multi-track view, that it is doing 32-Bit mixing.
Can I just mixdown to 16Bit, 44.1kHz Stereo without any dithering (as the files are 16Bit, 44.1kHz Stereo to begin with), or will I lose quality that way?
I will be performing a normalization to 96% to the mixdown and then split to tracks in Audition, as in the end I want to to have an audio CD.
I guess I could mixdown to 32Bit, then normalize and in the end save back to 16Bit, 44.1kHz Stereo WAV (with dithering, I suppose?), but I want to avoid any unnecessary converting steps.
Greetings

Any time you do any processing on a 16bit file in 16 bit only it will degrade the audio slightly due to rounding of the calculations. Working in 32 bit floating point (Audition's default) takes account of all bits generated due to processing.
So it is always best to work in 32 bit, even if your originals were 16, all the way through until the last stage of saving the files for CD burning. Any losses due to conversion will be insignificant against those due to working 16 bit.

Questions on Saving and mining data with Labview and DIAdem

Hi,
I am sampling two signals at 200k sampling rate. I am trying to save the data on harddisk and analyzing the data using DIAdem.
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I used the software Clampex and pCLAMP(Axon Instruments) before. At the same 200k sampling rate and also acquiring two signals, these programs save the data as .atf format and the size is only 400 MB for 10 mins' acquisition.
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Hi, Jonathan:
I tried the TDM binary file format. The file size is 800 MB per min acquisition and it will take a long time to just open these files. For my application, I have to take data for several hours. I am looking for a way to reduce the size of files.
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Merging labview and mathscript array question tia sal2

Greetings,
I really like mathscript functionality it’s just taking a
while to learn how to merge labview and mathscript together. I can get an XY graph out which plots the
correct wave function (thanks to the forums help) the problem is going from 1-D
Array of cluster 2 elements to 1-D of waveform Double so I can get a sound representation
of the waveform.
Anyone have any suggestions.
Tia sal2
Attachments:
mathscript formula to sound with waveform graph.vi ‏248 KB

Sorry not sure what happened internet gremlins maybe...here's the vi and graphic image
Second try Hopefully this will work
Attachments:
mathscript formula waveform graph.vi ‏1 KB
image_of_mathscript_to_labview.jpg ‏108 KB

Questions about LabVIEW

Dear support team,
Could someone please respond to Eric's questions? Eric works at Bonneville Power Administration and they are gearing up for another major LabVIEW and DSC project. He may have LabVIEW 7 beta. I am on my way out of town for two weeks and won't have access to phone or email. Thanks!!
Tricia Lee
DSM Inland Northwest
[email protected]
"Pierce, Eric - TNCB-TPP-2"
05/01/2003 08:05 AM
To: [email protected]
cc:
Subject: The list of question i never sent
Sorry for the long delay, things have been very busy here with this new project. I have questions / concerns about the DSC, OPC and LOGOS; first here is our architecture.
We will have two servers running windows 2000 server. Both servers will be live and need to have all DSC components installed. One server is to act as the primary server and the second is to act as a failover server. We have custom components that manage all of our custom services, if one of the custom services stops responding the failover service will shut down all custom services on the primary server and start all of the custom services on the secondary server, thus, the secondary server becomes our primary live server.
My understanding is that we will have to load a *.spf file on each HMI that tells the HMI where the server is, at the same time we need to initialize the DSC and OPC with *spf and *.lpd files. Now I might have the file extensions wrong but the idea is the same. We have all of our data in a SQL 2000 database, how do we make sure that all of the configuration files match the SQL 2000 db? We have several GUI's that can edit the SQL 2000 data, how do we update the DSC / OPC configuration files?
So in short here are my current questions:
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How can we ensure that DSC / OPC / Logos configuration files match the data in SQL 2000?
Does any of this make sense? This labview stuff is very new to me.
Eric Pierce
ACS Group, Inc.
Sr. Software Engineer
w. (360) 619-6284

Hi Eric,
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Problem with Labview and an ARM Cortex

Good morning,
I am currently trying to use Labview with a board from ST Microelectronics (MCBSTM32) with an ARM Cortex Processor.
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But, when I try to launch the program (the simple loop as write in the tutorial n°2 : http://zone.ni.com/devzone/cda/tut/p/id/7029 ), Keil gives me an error via Labview:
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It seems that Keil does not allow an ARM Cortex from ST as the device.
Moreover, after having this problem, I am unable to use a Keil project ,even a project which worked before, without Labview. I need to restart the computer.
I also try to launch the Keil project generated by Labview, without using Labview, and it works. But as soon as I use Labview, I have the error.
Did anyone already have this error or know how to solve it
Thank you for your answer and sorry for my bad english.
Regards,
Raphaël VAISSIERE

Hi Raphi,
So let me make sure I understand,
The project created in LabVIEW errors out with the message "Argument 'DARMSTM' not permitted for option 'device"
If you open the same project in Keil uVision, it runs fine
Here are my questions:
1. So how does the code run when run through Keil? does it deploy and run fine?
2. Did you follow the porting procedure completely?
Your target STM32F103RB is techincally supported by Keil but you need to port the RTX kernel to it. This paragraph explains it:
To determine if your target already supports the RTX Real-Time Kernel, browse to the \Keil\ARM\Startup directory, then browse to the folder that corresponds to the manufacturer of your ARM microcontroller. If there is an RTX_Conf*.c file for your target, then the RTX Real-Time Kernel has already been ported for your ARM device. If no such file exists, skip to chapter 4 for more information on the RTX Real-Time Kernel and a guide for porting RTX to your ARM microcontroller.
You also need to port the Real-Time agent to it.
I just want to make sure that you have followed the guidelines. If you have and are still having problems, we will continue to explore this.
Thanks,
National Instruments
LabVIEW Embedded Product Support Engineer

Problems with Labview and Windows XP with error -2147217865

Hello. Im a new beginner in Labview and am having a problem with a error message
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The program is written by a guy on my university, and logs voltage from
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find out what's wrong.
The error message is as follows :
Error -2147217865 occured at Cmd Execute.vi->DB Tools Insert
Data.vi->Solcelle.vi
Possible reasons :
Exception occured in Microsoft OLE DB Provider for ODBC Drivers,
[MySQL][ODBC 3.51 Driver][mysqld-3.23.38-log]Can't open file :
'solcelledata.MYD'. (errno: 145). in Rec Create - Command.vi-
>Cmd Execute.vi->DB Tools Insert Data.vi->Solcelle.vi
I really hope someone can tell me what's wrong and specifically what to do
with it, or possibly guide me to someone who could suggest a solution to this
problem.
Reguards
chrisdee

Hi Chrisdee,
(.. not to discount what TimoS has suggested, however...)
Embedded in the error information you provided:
... Can't open file : 'solcelledata.MYD'.
Sounds like the program needs this file? Has the program been moved to a new location?
just a wild guess!
Cheers
Message Edited by Dynamik on 10-06-2005 04:53 AM
When they give imbeciles handicap-parking, I won't have so far to walk!

Communicating between LabVIEW and Basic Stamp 2.0

Hello,
We are trying to control the movement of a Parallax Boe-Bot (robot with
Board of Education) via LabView programming. The BOE operates on
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motors.
Is there a way to establish communication between LabVIEW and Basic
Stamp 2.0? We need to send commands from LabVIEW to the
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The ultimate goal is to do this with wireless communication, but for
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Any ideas?
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Hi Adam,
You can communicate with a BASIC Stamp microcontroller over GPIB using VISA. To see some LabVIEW example code, just search for GPIB in the NI Example Finder (Help>>Find Examples). This will show you the basics of GPIB communication in LabVIEW. I also found this link by searching the NI discussion forums for "basic stamp"
http://www.parallax.com/html_pages/downloads/software/software_basic_stamp.asp
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Large applications - Labview and other programming languages

Hello Labview Users,
as the forum saw this very interesting thread about large applications programmed in Labview
(see: http://sine.ni.com/niforum/niforum?requireLogin=False&forumDU=http://forums.ni.com/ni/board/message?... ) I would like to ask the community about their experiences with Labview applications in combination with other programming languages.
In advance: I have several years of experience in programming Labview applications starting from quick-and-dirty solutions which had to run within few hours and complex test solutions. I saw Labview growing and becoming better with the released versions and lot of things I missed in former times got implemented in the meantime. Actually I have to develop a complexe ATE solution with numerous equipment to control and numerous data to be captured and archived. Despite the Verison 8 I still feel still some drawbacks of the LV concept which let me hestitate to setup the solution completly in Labview:
1) It is alway hard to re-use code of complex applications since it is not possible to do some kind of global search an replace of functions
variables etc. It nearly impossible to re-use approved code structures (e.g a state machine) if the "inner part" is changing more the a little bit.
2) If the application requires a certain flexibility (e.g. exchangeable test equipment of varying vendors) this is hard to implement since you have to define a lot of parameters through your hierarchy if you dont want use global variables which slow down your application and hide
the code functionality.
3) Despite modern PCs the look and feel of LV applications appears somewhat slow compared to other applications. For complex user interfaces the polling methode generates a lot of complex code. (I dont have expierence with the event-structure).
Now my questions:
Do you have experience of implemention of complex solutions dividingthe code modules using Labview and other languages? Which other
languages did you use? Why did you use these languages (speed, flexibility of text based code, available library functions)? Did you found out this to improve your development time and code maintainibility?
(I concider a solution where I do the single tests with Labview-VIs but delegate all the test sequencing and data collection stuff written in PERL which allows really very compact code)
I'm curious what your experiences are.
rainercats

Given that you're asking these questions in a forum for LabVIEW users the opinions given are going to be somewhat slanted towards the general like of LabVIEW. I've been working with LabVIEW for a long time, ever since 2.something on a Mac. I've written numerous large-scale applications as well as "mundane" instrument drivers. As you've noted you're experienced with LabVIEW, so you know some of its strengths and weaknesses.
To address your specific questions:
(1) Yes, that has always been a limitation in LabVIEW, but I don't believe it is an overriding one to choose C over LabVIEW. Putnam provided one workaround for the search and replace of VIs. Once you've programmed in LabVIEW long enough you get used to doing it this way. Is it clumsy? Yes. As for the re-use of code structures, that's not entirely true. You can create a "template" VI (a regular VI, not a .vit) that contains the code you want to re-use and place in your palette with the "Merge VI" option set. That way you can select it from your functions palette, plop it down on your diagram, and you get the "template" VI's diagram placed right into your new VI.
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Reference Library for Converting Between LabVIEW and XML Data (GXML)

Please provide feedback, comments and questions on the Reference Library for Converting Between LabVIEW and XML Data (GXML) in this thread.
The latest version of the NI GXML Library is availble in VIPM on the NI LabVIEW Tools Network repository.

Francesco, Thank you for the feedback. With this component it was my intention to make a more "terse" version of the LabVIEW Flatten to XML VI that was also supported on RT and that gave the user more flexbility regarding the structure of the parsing type definition. I think you are right that the XML parser is not compliant to section 2.11 of the XML spec. The parser does specifically looking for a #D#A and this appears to be an oversight on my part. Please confirm for me, the specifcation is saying that the XML parser should be able to recognize three possibilities as an "end of line" character: #D#A, #D, or #A. Am I reading this right?There are more efficient (and in some cases much more efficient) ways of sharing data between LabVIEW and LabVIEW: some examples are flattened binary strings and the datalog binary format. XML is slower than these optons but the upside is that it is human readable. Furthermore XML is inherently hierarchical which is convenient for complex data structures like clusters of arrays of clusters, etc. If you don't care about human readability then you are correct XML doesn't make as much sense.I will return to the GXML source code and try to fix this in the near future but I would hope that instead of creating yet another custom VI from scratch that you could reuse what I have provided for you. I included enough documentation in the source code so that users could make some modificiations themselves. The target application for this reference library was LabVIEW to LabVIEW communication. As such I documented the schema on the dev zone document from a LabVIEW perspective. It includes all the supported datatypes and all the supported data structures (cluters, arrays, multidimensional arrays, clusters of multidimensional arrays, etc.) I do see some value in making a more conventional XML spec but the time investment required didn't really line up with my intended use case. Were there any other downsides to GXML that I have missed? Best Regards, Jeff TippsSystems Engineer - Sound and VibrationMessage Edited by Jeff T. on 04-21-2010 10:09 AM

Please help me with my electrical engineering homework : temperature control and watering system for greenhouse using labview and arduino

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spesification :
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Duplicate thread. Please keep the discussion in that thread where you already have a response. It is also the more appropriate thread for your question.
Lynn

Use NI LabView and LabView RT with third party PXI chassis

I want to use NI LabView and LabView RT, some PXI chassis of N.I and
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More simply
Third party PXI chassis and controllers support LabView RT or not?
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"You can't. I think NI bought Pharlap, and they do not offer board support packages (BSPs) for non-NI PXI controllers. There is no way to get LabVIEW-RT running on a controller not purchased from NI. You will have to use a standard RTOS like Linux,VxWorks, or QNX.
Regards

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http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/cb3434da94466dd286256e9e006bb775?OpenDocument
http://sine.ni.com/nips/cds/view/p/lang/en/nid/13751
Instead of using LabVIEW Real-Time for ETS, you could use LabVIEW Real-Time for RTX instead. This system allows you to run Windows and the Ardence Real-Time eXtensions (RTX) real-time kernel concurrently on one machine. Currently device support for LabVIEW RT for RTX systems is limited to RIO devices. This is all described in the below link.
http://zone.ni.com/devzone/conceptd.nsf/webmain/9cc60298315a687e86256e78007b3a96
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Beginner Question

Hello all, hopefully I have posted this to the correct LiveCycle board!
I'm new to Acrobat and LiveCycle in general. I'm working out of windows LiveCycle Designer 8.x and my question is as follows....
I'm working off of the "Quote" Form Template and what I am looking for is a way to make the rows of the Table expand as needed. I will be converting this Template into a "Purchase Order" form, and there will be many occassions where I will need to increase the table rows - perhaps onto a second or even third page - due to the volume of different items I will be seeking prices on at a given time.
Long story short I would like to take this "QUOTE" form template and make it such that if needed, I can expand the table size one row at a time, pushing the content beneath (Comments, subtotal, etc) onto the next page....
Hoping I have explained my query well enough, Could anyone provide me a solution or point me in the correct direction?
Many thanks!

As a followup, so as not to clog the board with numerous threads I have another beginner question
For the sake of hypotheticals I am creating a dynamic PDF form. This pdf is a Purchase Order Form, with a table in the Body that will expand/contract as the form user needs. (EXA- Default table size is 5 items, however user is creating an order for 12 items, he/she can increase the table rows to desired capactiy.) It will be a very simple layout. All data for the form will come from manual entry, no XML data binding going on.
My new question is as follows:    Is there a way I can have this user's Adobe reader or Adobe acrobat software remember previous data entries, so that if 4 weeks after ordering widget X he/she needs to place another order for widget X, the software will autofill the table as he/she types into the table cell?
This would be similar to how Excel will start to autofill if it recognizes a previously entered value from some other cell in the worksheet (workbook?)
EXA-
[NAME]   [MODEL]   [QTY]   [PRICE]
Widget           A            433        $30.00
Would it be possible for the software to notice that I'm typing the word "widget" somewhere after typing "wid" ???
Many thanks for any and all followups, I'm a teenager trying to help out in my father's small business. They are in the darkages here and I'm doing my best to self teach.
Thanks.

Beginner question on labview and transducer

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