topic Re: oscillscope project in LabVIEW

oscillscope project

kmous — Tue, 20 May 2008 15:57:14 GMT

Hi I am new to Labview , and I have a project to do using oscillscope , should i know how the oscill work before i proceed ? if yes can u give me some websites to start with ? thank you

Re: oscillscope project

smercurio_fc — Tue, 20 May 2008 16:05:24 GMT

http://en.wikipedia.org/wiki/Oscilloscope

What exactly do you need to do with an oscilloscope?

Re: oscillscope project

Ray.R — Tue, 20 May 2008 16:54:32 GMT

It is generally a good idea to know the instruments that you'll be working with.

You will need to know things such as:

1. How will you communicate with the instrument? (GPIB, Serial, Ethernet, USB)

2. Is the instrument a physical standalone one (communicate as above), or is it a PCI card (or other PC, PXI, card level unit)?

3. What measurements will you be making with the instrument? (voltage level, frequency, etc)?

4. Will masks or levels be used to determine outcome of a test?

Can you provide more description of your project and how you plan to use the scope?

RayR

Re: oscillscope project

kmous — Tue, 20 May 2008 18:39:53 GMT

Thank you guys , I did not get my project yet ...I will have it the next meeting I do , I will let you know when i start 🙂 Thx guys

Re: oscillscope project

kmous — Tue, 20 May 2008 19:18:52 GMT

1)what I know for now is that My Ni cDaq-9172 is connected to my pc using USB and it works fine.

2)I Have an analog module connected to my instrument

3) i dont have a generator yet but this is what i am gonna use to simulate my signal from the oscill and display the voltage + frequency + 4 channels on my LV front panel 🙂

so basicaly it is the same thing as what oscill does but i need it in LV ....i dont want a sol from u guys because i wanna learn but what do u suggest me a start ???

Thank you soo much

Re: oscillscope project

smercurio_fc — Tue, 20 May 2008 19:26:09 GMT

Well, you could start by looking at the "Two Channel Oscilloscope" example that ships with LabVIEW. Open the Example Finder (Help -> Find Examples), and search for "scope". The VI works by simulating two signals, but you can replace this with the data acquisition collection from your DAQ. There's plenty of examples on how to to that in the Example Finder.

Re: oscillscope project

kmous — Thu, 29 May 2008 12:31:26 GMT

hello again , i have 2 modules NI9205 (Analog input ) and NI 9263 (Analog output) whcin one i have to use to simulate an oscilloscope signal ? on cDAQ-9172

Re: oscillscope project

kmous — Thu, 29 May 2008 13:07:41 GMT

UMMM I found out zat it is the NI 9205 🙂 right ? ok now how can i connect my Generator "Generateur" to 4 ch in this module ?
I appreciate ur help

Re: oscillscope project

smercurio_fc — Thu, 29 May 2008 14:01:32 GMT

I have no idea what you mean by this:

how can i connect my Generator "Generateur" to 4 ch in this module

Can you rephrase that?

As far as connections, the analog input module would be the one that operates in the same was as a scope. Clearly, you need to provide some sort of input to it. You can provide an external signal or you can feed it one of the outputs from the analog output module. Which way you do it is up to you, and what seems easier to you. Alternatively, you can use simulated DAQmx devices and write your code that way. You can add simulated devices in MAX (Measurement & Automation Explorer). Read the documentation on how to do that.

Re: oscillscope project

kmous — Thu, 29 May 2008 14:07:53 GMT

my module has 32 channels as u know , i wanna simulate 4 signals so i have to connnect 4 channels between my module and my signal generator (oscilloscope) right ?
Do u have any example in how to implement such a situation , i wanna simulate a signal coming from oscilloscope and see the voltage and frequency on a graph ??

Re: oscillscope project

smercurio_fc — Thu, 29 May 2008 14:15:59 GMT

You are not understanding what an oscilloscope is. An oscilloscope does not generate signals. It is used to look at signals. Did you read the Wikipedia page on oscilloscopes?

Re: oscillscope project

kmous — Thu, 29 May 2008 14:21:09 GMT

ooooops I am sorry i meant "generateur des signaux analogues" what i wanna do in LV is the same thing Oscill does , show the signal , it's voltage and it's frequency ...is that clear ? 🙂 hope it helps.....
thank you again

Re: oscillscope project

smercurio_fc — Thu, 29 May 2008 14:29:55 GMT

Just take a look at the many examples that ship with LabVIEW on how to do data acquisition. You can also look at these tutorials:

Introduction to Data Acquisition
Complete Data Acquisition Tutorial

Re: oscillscope project

Ray.R — Thu, 29 May 2008 16:53:41 GMT

kmous wrote:
ooooops I am sorry i meant "generateur des signaux analogues" what i wanna do in LV is the same thing Oscill does , show the signal , it's voltage and it's frequency ...is that clear ? 🙂 hope it helps.....
thank you again

Bonjour,

Un generateur de signale s'intitule "Signal Generator" en anglais.

Est-ce que tu veux creer un VI qui te permet de simuler un generateur de signal que l'oscilloscope va mesurer?

Are you trying to create a Signal Generator VI that will be used to simulate the signals measured by the oscilloscope?

RayR

Re: oscillscope project

kmous — Thu, 29 May 2008 17:09:40 GMT

I am trying to create a VI that will be used to simulate the signal coming from Signal Generator , that means instead of using oscilloscope to show the signal , i will be using my VI so no need to Oscillo after ? got it 😞 ? wish that help
thank you for the help

Re: oscillscope project

Ray.R — Fri, 30 May 2008 01:58:24 GMT

The first portion will be to define the features of the signal generator, such as:

Waveform of the output: Square, Sinusoidal, Sawtooth (triangle)

Amplitude: Level of waveform comapatively to a voltage equivalent.

Frequency: Min & max values.

There are functions you can use to implement these.. Also some examples..

Since it will be a simulation, you can use the appropriate graph to display the resulting waveform.

RayR

Re: oscillscope project

Ray.R — Fri, 30 May 2008 02:05:06 GMT

Look at the attached example. It is a VERY basic signal generator connected to a graph.

Is this the type of vi that you are trying to create?

RayR

Example done in LV8.5

Re: oscillscope project

kmous — Fri, 30 May 2008 12:36:54 GMT

can u plz save it in LV 8.2.1 ? thank you

Re: oscillscope project

Ray.R — Fri, 30 May 2008 13:42:59 GMT

Here it is in LV8.2.

Re: oscillscope project

kmous — Tue, 03 Jun 2008 13:59:00 GMT

Hello all ,
here is an exact descripition of what i want to do : (Note : I am new to labview and i got this to do and i really need help because i am new to this language )
Well I have my NI eDAQ-9172 connected to my pc .
I have NI-9205 Module connected to this DAQ (it s for analog input 32-ch )
my signal generator will be connected to my module through 4 ch (ach1,ach2,ach3,ach4) that's what my manager said 🙂
the signal generator could be 1-"Amplificateur plate form , force plate ex : u touch a plate back and forward so u make a signal so i wanna simulate on a graph in LV " or 2-"generateur electromyographie- i think for muscles or nerfs measurement".......
would you plz make me a start VI to start with or atleast let me know how can start ?
i will really appreciate that !!
🙂
thank you