How to generate 3 phase sine wave to output on ELVIS

Hi .I need to make a star or delta connected circuit on ELVIS board.2 make this circuit I need 3 wave generator( with 120 phase shift) and one common ground
and because the ELVIS function generator can only generate one wave I decided to generate countionuos sine wave in Labview.
Now I can generate 2 continuis sine wave in labview and output them on the analog outputs of ELVIS.Ao-0 and A0-1
but I dont know what to do for the third signal.the elvis board just has 2 analouge output and when I use Ao-0 and A0-1 I cant use ELVIS function generator after that.so would u please help me on this problem.how can I output 3 contious sine wave in Elvis.I have attached my VI to this post
Attachments:
new.vi ‏38 KB

Hi, I am also having some problem in generating two signals from two AO. Could you please tell me how to generate two different signals from two AO. I have attached vi which generate square wave from one AO 0. I need the inverted signal in AO 1.
Attachments:
Pulse Width Modulation.vi ‏48 KB

Similar Messages

Help needed with generating a sine wave with NI-5640R card

Hi there,
I have created a simple programe using the 5640R card, and i am attaching the programe to this question. Using a "sine generation" function/block i am generating a sine wave and outputting to one of the o/p ports and then i am connecting that o/p port to one of the i/p ports using a cable. Then i am plotting what ever i have recieved through the i/p port (this has to be same as what is generated using "sine generator" ). The graph shows that i am not receiving aything from the i/p port, but when i plot the o/p of the "sine generator", i see that the sine generator is generating the sine wave. Please refer to the attached figure and please tell me what mistake i have made in this simple programe.
Thanks,
Sandeep.
Message Edited by sandeep palreddy on 07-08-2007 12:46 PM
Sandeep Palreddy, Graduate Research Assistance
The Microwave Remote Sensing Laboratory (MIRSL)
University of Massachusetts
151 Holdsworth Way
Amherst MA 01003-9284
Attachments:
figure.doc ‏27 KB
figure.doc ‏27 KB

Hi sandeep
This small segment of code will not work on the NI PCI-5640R. This module does not support running the FPGA Vis directly. A Host VI must be run that calls to the FPGA Vis.
I suggest that you look at the ni5640R Analog Input and Output example that is installed by the NI PCI-5640R software.
Jerry
PS: Make sure that you are using the NI PCI-5640R software version 1.1.

Generating a sine wave using PXI 5441

How to generate a sine wave using PXI 5441 (Arbitrary Waveform Generator)?
Can anybody post a vi that generates a sine wave with frequency at a user defined frequencies.
Thanks in advance.

Hi Venki,
When using an arbitrary waveform or user-defined
waveform, you provide the actual waveform you want to generate to
the device, so it is easy to also just connect a graph to the waveform
and see what it looks like. Unfortunately, when using standard function generation (which is the method used in this example), you are not providing a signal that is created in software. Because the standard function
generation is happening on the FGEN and not in software, there is
really no way to display the exact signal without measuring
it on a scope or some device. You can, however, simulate the signal in
software such that the parameters which are given to the FGEN functions
are the same parameters that you use to generate a simulated wave. This
would be somewhat complex since you can change parameters such as
frequency and amplitude on-the-fly, and also you would need separate
functions for each of the different signal types available for the
FGEN. You would need to place the software waveform generator in your
inner loop and have a waveform graph connected to it in the loop as
well to display the signal. The main thing to keep in mind is that this
will only be a simulated signal and so it may not exactly match what is
being generated (this also depends on how you program the simulation to
work). Hope this helps,
Daniel S.
National Instruments

How to get the sine wave sample of the input and output in the same time?

I discovered that the samples were acquired did not in the same time in my vi.Could you tell me how to get the sine wave sample of the input and output in the same time?
Output:9263;
Input:9201
Attachments:
singal requency.vi ‏104 KB

Hello Yun_Zhu,
Your VI looks like you started from an example, and you are on the right track.
To clarify are you trying to synchronize the input and the output waveforms? If you you will need to share a time base and a start trigger. Check out the synchronization examples from LabVIEW
Anthony F.
Product Marketing Engineer
National Instruments
Attachments:
HIODAQmxSyncMultiDev.png ‏70 KB

How to use pci 6229 to generate a sine wave?

Dear friends,
I want to use pci 6229 to continuously generate a sine wave by 5000 sampling rate to output to drive a loudspeaker.
Does any one can post an example so that I can learn from it?
Many Thanks
Probiee

Dear Denis,
Thank you for your reply. I have done with this following vi. please see the attachment.
please give me some feedback with my vi.
Many Thanks
Probiee
Attachments:
danforum.JPG ‏119 KB

Analog input to modulate triggered sine wave analog output

I'm new to Labview and having trouble getting my app to program correctly.
I would like to use an analog input (AI) to modulate the amplitude of a
100 kHz sine wave and output the results to an AO. This is a real
time application: the AI will change every few 10's of ms so during one
"cycle" the amplitude will be modulated many times. Plus, the entire AO
will be triggered on and off with a digital input TTL trigger. The
waveform "cycle" will run continuously and so will the AI.
I've used an example included with Labview to read
the AI and a separate one to generate the sine wave and trigger it on
and off, but cannot combine the two together. I assume what I need to
do is implement a loop properly but when I try I can only trigger the
AO on and off and the AI does nothing or is static. I assume that the
vi just takes one point from the AI and uses that to determine the
amplitude of the sine wave, but doesn't "redraw" the sine fast enough
to respond to the AI changes.
Thanks,
Ethan

Hal,
I do not think I have Labview Realtime (unless it comes standard with the full version of Labview ). Do I need to have that? I have a 6251 DAQ board.
I've enclosed my program- it has the name of the original included program in its file name so you can see that I didn't do much to change it. I made some changes today (to make it non regeneration) but now can't get the AI to read at all. And I have no idea how to modulate the sine amplitude using the AI.
The sine wave works fine and triggers as needed. The one problem is that the sine wave doesn't end at the same point (phase) each trigger period so during the times between triggers the DC level on the AO is variable (which I do not want). Is there a way to end the sine wave at the same phase (at the zero crossing) while still triggering it with a digital input.
Thanks,
Ethan
Attachments:
ERB6-Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi ‏157 KB

How do I simulate sine waves up and down several triangular waveforms?

I need to simulate a number of sine waves at about 10 or 20 Hz and run these up and down a number of triangular waves. I am using the "Simulate Signal" box which generates the sine waves but am not sure what or how to connect to this to "ramp" the sinusoidal waves up and down triangular waves. The triangular waves would run at about 1 Hz.
thanks
Martin

Martin,
It seems as if you could use a second "Simulate Signal" VI, set it for a triangle pattern at your desired frequency, and then add the resulting waveform to the sine waveform. If I run that in a loop, I get a nice ramping sine wave (see attached image).
Hope it helps,
John
Attachments:
triangle_sine.png ‏8 KB

How to generating three phase sine wave simutiously with Vistual C++?

Here I want to generate three phase sinewave at the same time with the phase angel 120 continiously. I can creat a task that contain 3 AOs, and generate 3 same sine wave at the same time. But I can not create 3 individual task which contains one AO channel, and write data to FIFO. Please tell me how to realize it?

Hello, Rilee,
Thank you very you very much. But I am still confused. The website I can not open. As you said, I shall create a data array to contain three phase data, for example, sinedata[750], sinedata[0:249] contains first AO, and sinedata[250:499] the second, and the rest is the third. then
1. send the data for sinedata[0] to sinedata[249], to the board. with DAQmxWriteAnalogF64;
2. send the data for sinedata[250] to sinedata[499], to the board. with DAQmxWriteAnalogF64;
3. send the data for sinedata[500] to sinedata[749], to the board. with DAQmxWriteAnalogF64;
and or so.
Is all the above description right?
Here I have several questions:
1. When shall I send second section sample data? I think it shall be all the first data have been written to the board. And How can I know that all the first section data have been sent to the buffer?
2. If I call DAQmxWriteAnalogF64 to write the second section data to buffer after the have finished first section data written, will this function affects the wave of the first section data?

How can I calculate the frequency of a 2-4Hz three phase sine wave in 50msec?

I want to calculate the frequency of a sine wave using either all three phases or just one, but I want to know the frequency after 50 msec, I don't want to have to wait for a full period.

I have a mathematically sound suggestion but I do not know how well it will work in application. Most period measurements measure the time between a full period or several periods to eliminate the error introduced by the measuring device. Essentially the device error is made insignificant.
Mathematically you can do much more but there is a tradeoff between recording less information and knowing (or assuming) some values. For instance, if one knew the amplitude and could calculate the derivative of the signal, one could calculate the frequency. A sine wave can be represented by the function: A sin (BX)=C , where A is the amplitude, B is the frequency, C is the present measured value. If the equation is solved for X, we get: X=(sin^(-1)(C/A))/B. The d
erivative of the first equation is AB cos(BX)=C. If the equation for X is now substituted into the second equation, we get, AB cos(B (sin^(-1)(C/A))/B)=C. Solving for B we get B=C/(A cos(sin^(-1)(C/A))). Remember, we already know A and C, so we are done.
Practically every step and assumption in the above argument introduces possible error which will affect the accuracy of the frequency. Unfortunately it is a trade off and that is why at least a whole period needs to be measured to get an accurate frequency.
Jeremy Braden
National Instruments

How to view different sine waves in an array and make an fft of these and display it in one graph

How can i cannect the output of my mathscript in the Spectral Measurements VI SIgnal Input. I'm having a problem since the output of the mathscript file "D" is DBL 2D. I dont know how to convert this data type in order to be connected to the signal input of the Spectral Measurements VI. I also want that the waveform graph connected to output of the Spectral Measurements VI, will display the FFT of the three sine waves in one graph.
Attachments:
1.JPG ‏32 KB

Duplicate
LabVIEW Champion . Do more with less code and in less time .

Generate n sine waves and add them together

Hi
I'm new to Labview and I want to generate n number of sine waves and add them together to form one signal that can be out put through a DAQ card. Each successive wave frequency will be the multiple of a base wave all will be the same amplitude.
This to me suggested a For loop with a sig generator and a passback in it but when I tried this it threw an error because the dt were different.
Any help will be appreciated.
Thanks

Show us what you did.
LabVIEW Champion . Do more with less code and in less time .

How to obtain a sine wave polar representation?

i need some hint

LabVIEW has a polar plot. I do not know if the Base Version has the featur though. Goto functions >> graph >> ctls >> polar plot indicator. This places a combination VI and picture control on the diagram and front panel. The data terminal for the VI is an array of clusters of mag and phase in degrees. You can easily construct the data for a sine wave in a For Loop by bundling 1 with the i and building an array of 360 elements.

How to generate a Spool based on output type in SAP Script

Hi all,
Is it possible to generate a spool based on output type for a SAP Script (without explicitly trigger in Tcode VF02 and selecting output type from there )
Actually a background job will be scheduled to process output types selected in VF01 / VF02
When output type is ZABC in the background a work flow is called pdf is generated

Any suggestions please

Generate two sine waves with time delay

I have not been using the waveform generation tools so I hope this is an easy one for somebody. I want to create two sine waves at different frequencies say F1 = 1.00 KHz and a second at F2 = 1.20 KHz. I know that to combine them into one I can just add them. Them problem I have is that I want F1 to start first then a few millisecond later have F2 sum into F1.
T0 = F1
T0 + Delay = F1 + F2
Is there a VI capable of a time delay? Tried to sum individual signals together but seems more difficult because of the waveform cluster format.
Any help is appreciated,
Matt
Matthew Fitzsimons
Certified LabVIEW Architect
LabVIEW 6.1 ... 2013, LVOOP, GOOP, TestStand, DAQ, and Vison

Would the attached VI work for you?
Attachments:
Add Delayed Sinewave.vi ‏54 KB

GRC AC 10:How to generate Access Rule? No output from User or Risk Analysis

Hello Gurus,
We have done configuration of GRC AC 10, and uploaded files via
SoD rules -->Upload Rules
After that we generated SoD rules for Risk Id : B001 and B002
Now when we go to NWBC --> Reports & Analytics >Access Dashboards>Access Rule Library
The report shows (for Group Rule level : Action)
Number of Active rules : 0
Number of Disabled Rules : 0
Number of Functions : 151
Where as for Group Rule level : Action Risk
The report shows
Number of Active Risk : 42
Disabled risk : 161
Nmr. of functions : 151 .
When we perform Risk Analysis at User Level or Role Level, the output is empty !!!
Note: All the background jobs have run successfully.
Also the SoD files also have been uploaded successfully.
Will you please guide how can i activate the "rules" for the uploaded risk ??
regards,
Victor

Hello Victor/ Inder,
For Risk ID B001functions are BS02 and BS11 if you open any one of them you can see system maintained as SAP BASIS which is SAP_BAS_LG (logical connector group).
Post installation you can check in SPRO>Governance, Risk and Compliance-> common Component---> integration framework-> maintain connector and connector types->select SAP and click Define connector Group.
BUSINESS     Business Roles     SAP
SAP_BAS_LG     SAP Basis     SAP
SAP_CRM_LG     SAP CRM     SAP
SAP_ECC_LG     SAP ECCS     SAP
SAP_HR_LG     SAP HR     SAP
SAP_NHR_LG     SAP R3 - NON HR Basis Logical Group     SAP
SAP_R3_LG     SAP R3     SAP
SAP_SRM_LG     SAP SRM     SAP
(If not present then manually you can create the same)
Select SAP_BAS_LG and put connector type as SAP, select SAP_BAS_LG and click Assign Connector group to group types as AM & LG, then click on Assign Connector to connector group and maintain you connector.
Post this activity re generate SOD for B001 and then check for user level and role level analysis.
Hope it will resolve your issue.
Regards,
Sudesh

How to generate 3 phase sine wave to output on ELVIS

Similar Messages

Maybe you are looking for