Generate Sine wave using NIDAQ

How can we generate sinewave using NIDAQ library fucntion in VC++.

Hi,
There are examples of creating a waveform in VC++ that come with the DAQ driver. They can be found here:
C:\Program Files\National Instruments\NI-DAQ\Examples\VisualC\Ao
In this folder you can select from any of the WFM examples, which will all create different types of waveforms on your Analog Output channel. There are descriptions of each example contained at the beginning of the program.
Good luck, and happy programming!
George

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How to generate finite cycles of sine wave using daq mx in vc++

Hi,
How to generate finite cycles of sine wave or for finite duration in vc++ using hardware timer without any sleepfunction in the code.
Thanks & Regards,
satya

Hello Elizabeth,
Thanks for the response.
1) I am using NI 6040E PXI.
2) I am using NI-DAQMx 8.3
3) Measurement Studio is 6.0.0.105
4) Operating system is Windows XP.
I want to generate sine wave for finite duration previously in traditional daq there was function called wave_op.In which we can mention number of cycles of sine wave we wanted to generate. That function is not available in DAQMx so we have to use sleep function to generate finite period. Any hardware control function to control generation of finite cycles please let me know.
Thanks & Regards,
satya

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

Simultaneous updation of sine wave using 2 PXI-6711 cards using RTSI Trigger

Hi ,
How to generate continuous sine wave using two pxi-6711 cards at same time without any phase shift using traditional nidaq functions.
Regards,
satya

In LabVIEW, go to Help>>Find Examples. Navigate to Hardware Input and Output>>Traditional DAQ>>Multiple Device. There is an example there called "Two E Series Shared Scan Clock". That example is for analog input, but you should be able to modify it to be for analog output. Basically you will just have to share the scan clock from one board(master) and use it as an 'external' clock for the other board(slave).
-Alan A.

Unable to generate sine wave

Hello everyone!
I am currently working on my Bachelor project at a company. i am stuck with a problem.
I have designed a labview program for vibration test system. I have used cRIO 9076 as the controller with NI 9263(as D/A) and NI 9234(as A/D).
The loop works as follows. the input is given from the labview program. it is then sent to the cRIO. the output of CRIO(that is output from NI 9263) is given to the amplifier. the vibration shaker vibrates based on the input from aamplifier. then the accelerometer detects the vibration and sends it to the NI 9234 and loop repeats iteratively. since i have designed a sweep sine vibration system, the output of cRIO is a square wave. it should be sine wave.
the probelm is i am getting a square wave as output from my NI 9263 which should be a sine wave output. I have two subVI where i use nominal to binary convertor(for NI 9234) and binary to nominal (for NI 9263) as calibration mechanism.
the question is where have i went wrong? what should I do to get a sine wave?
PS: on searching NI i found out some formulas (to generate sine wave) and designed a FPGA and LabVIEW program to generate a simple sine wave and got a sine wave. if that formulas is to be included where should i include that?
Thanks in advance.
Regards,
Vishal.

Without seeing your current code, there is no way we can even uess as to why you are creating a square wave instead of a sine wave.

How to dynamically adjust Frequency, Phase and Amplitude for a Generated Sine Wave in C/C++?

Hi,
I wonder if anybody know how to dynamically adjust Frequency, Phase and Amplitude for a Generated Sine Wave in C/C++? This is a part of my project: I need to dynamically generate a sine wave voltage signal by some calculation using the data from a simultaneous analog input and another signal.
Your help will be appreciated so much!
Marlon

Hello Marlon,
Here is an example of changing frequency and ampliude for an E-series device in Labwindows/CVI. The programming should be similar in C for your S-Series device. As is says on the linked webpage above, this process is going to be very processor intensive since you will continually be creating a buffer.
Nicholas C
National Instruments
Applications Engineering

To generate sine curve using sine pattern.vi

I tried to generate sine wave to provide sine curve to the motor. I used sine pattern.vi and the vi located before the while loop. I could not put it inside 'while loop' to change the amplitude of the sine curve while the program runs. What do I have to make some changes in the program to provide different values in 'sine pattern.vi' while the program runs?
Attachments:
AO_command_sin_input_with_position_info.vi ‏165 KB

Jae,
Looking at your VI, it seems that what you want to do is update the sinewave generated on the fly. Try using the Point by Point functions to generate a sinewave, they will give your the most flexibility. I am attaching an example that generates a sinewave point by point. If you change the value of the frequency control, you will see that the frequency of the waveform will change on the fly.
Attachments:
Generate_Sinewave_PtByPt.vi ‏32 KB

Please help simulation synchronizing dual sin wave using PLL labVIEW

Hello,
Please I want a simulation based on Lab view for synchronizing generators, as we know that the generator will generate a sin wave.
If anyone can help me with this idea the simulation can be done using to input sin waves and synchronized with each other using PLL (phase lock loop), note that the generators will be synchronized if the frequency, phase angle and voltages are equal ( synchronized). Please if somebody has simulation based on this idea to help me with it.
THANK YOU A LOT.
I will appreciate it.

Iam new on LV. what i want a simulation to synchronize two generators, the two generators will generate sin waves this sin waves will be compared to achieve synchronization its better to use PLL but i have no idea where to use it in this such simulation.
The below attachment will discuss more what i want but it it can be editted instead of using two generators from outside is to put to sin wave and prove that when this two sin wave are not equal so synchronization faild and vice versa.
no need for the DAQ it can be replaced by an oscilscope to see the two sine waves that are synchronized, any one can help me by this simulation i will bs very thankful for him.
THANK YOU ANYWAY
Attachments:
paralleling.jpg ‏145 KB

How do i measure the frequency of a sine wave using a field point counter module

I need to measure the frequency of the sine wave using field point. is it possible and if yes how. do i need to convert the sine wave signal to square wave. Please let me know.

It probably would be easiest to convert the sine wave to a square wave with a simple external circuit and then use a counter module to measure the frequency. There is a shipping example in LabVIEW that shows how to measure frequency with a FieldPoint Counter module.
JRA

Trasnmitting a single sine wave using USRP

how do i transmit and recieve a single sine wave using USRP...i would really appreciate it if someone posted that example
i already understand the blocks of the usrp...but do i need to modulate the sine wave signal or i will just send it..i am really confused
i hope that you may post the example

Hey Eldokch,
See step 4 in the following white paper:
http://www.ni.com/white-paper/13880/en/#toc4
It uses two examples packaged with the NI-USRP driver, "niUSRP EX Tx Continuous Async.vi" and "niUSRP EX Rx Continuous Async.vi".
-Jim B
Applications Engineer, National Instruments
CLD, CTD

Generating a 6X Sine Wave using an absolute encoder

How do I get an Analog Signal Generation Synchronized to six times the frequency of an absolute nine bit parallel encoders output with adjustable phase relation. I am using a PXI-6533, a PXI-6711 and have available a PXI-6070E.
Now the long version of the problem. I have a 9-bit absolute encoder connected to a motor shaft (up to 420Hz). From the encoders 9-bit (0-511) parallel signal I need to create a synchronized 6X sine wave (up to 2500Hzwith an adjustable phase relation. Picture an electronic timing chain. For every cycle of the encoder, I need to produce six full sine wave cycles with a variable tuned phase shift. I have LabView 7 w/RT.
I have tried to use the Update Clock (PFI5) to step through a buf
fer but it seems to drop an update every so often. I also have tried to monitor the bit-0 line to determine freq. and scaled the update rate accordingly but the phase shifts all over the place. Does anyone have any ideas on the matter ? I would really appreciate it! Thanx….Phil

Phil,
Another different option to solve your application would be to use the new LabVIEW FPGA module and the 7831R reconfigurable I/O hardware. Using these tools you can configure the FPGA on the board to generate the sine wave based on the 9-bit parallel input. The most simple setup would be to have a lookup table in the FPGA that has a corresponding output value to each of the 512 possible input values. This 512 sample table would contain 6 cycles of a sine wave. Every time the parallel input changes the analog output value would be updated accordingly from the lookup table. This setup would also allow to easily add a phas
e shift of the output by shifting the point in the lookup table you are reading by a known constant.
Christian L
NICS
Christian Loew, CLA
Principal Systems Engineer, National Instruments
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Generating sine wave

Hello,
I have a small labview problem.
I want to generate a sine wave pulse with labview and send this to a pc oscilloscope by using my soundcard.
First VI I made creates a sine wave and sends it to the pc oscilloscope. Works perfectly.
But now i want to create a sine wave with only one period (second VI). Problem is then that the VI blocks if i want a high frequency (I need 10kHz)
So the VI works on low frequencies but gives this error with higher frequency:
"the sound driver or card does not support the desired operation."
Can somebody give a solution for my second VI (creating sine with one period on 10kHz).?
Thanks in advance!
Jelle
Solved!
Go to Solution.
Attachments:
GeneratingSineWaveManyPeriods.vi ‏59 KB
GeneratingSineWave1period.vi ‏37 KB

Hello Benje,
The problem/difference you're seeing is indeed in the coding and also in the sound card.
In the "working" example you're using the Simulate Signal VI with the following settings:
- 44100 samples per second (sample rate)
- Number of samples 10000 (samples per generation cycle)
In the non working example you specify:
- sample rate = 1000*"Frequency Control value". This sampling info should be fixed to (for example) 441000 Hz.
- Number of samples 1000 (samples per generation cycle)
As a sidenote:
Is there any reason why you used different functions to generate similar signals in the 2 VI's?
Kind Regards,
Thierry C - Applications Engineering Specialist Northern European Region - National Instruments
CLD, CTA
If someone helped you, let them know. Mark as solved and/or give a kudo.

How do I Fix DDS Generated Sine Wave That Produces a Periodic Square Wave?

Hello,
I'm an undergraduate researcher with almost no experience dealing with FPGA semantics and other National Instruments hardware in general. Part of my project revolves around creating a sine wave signal via the FPGA on an sbRIO-9632 that is output via the board's analog I/O pins, and I found it convenient to adapt the code provided by the National Instruments tutorials (http://zone.ni.com/devzone/cda/epd/p/id/6066) to have it run on an sbRIO FPGA. The problem I'm encountering right now is that the actual output I'm seeing is a square wave as opposed to the smooth sine wave that was expected, and I've exhausted all my ideas on possible ways to debug this issue. Can anyone please give me feedback if they've seen this problem before or offer other suggestions on fixing this?
I'm currently running LabVIEW 2009 with the appropriate real-time and FPGA modules on a 64-bit Windows 7 machine. Again, the hardware is an sbRIO-9632 complete with analog I/O. I appreciate it everyone!

I am also having this issue and have not been able to find a solution in the forums. I am somewhat of a rookie so pardon me if I seem ignorant in any way. I am working on a graduate project where I need to produce some sine waves and I am getting more of a square wave when I output it and measure on the scope. The program I am running is quite simple at the moment to attempt to discover any errors by process of elimination. I have the sine wave generator in a while loop outputting to an AO port. I am using the cRIO 9022 with the 9269 AO module. I will attach screen shots of my code and my oscope image
Attachments:
sine wave.jpg ‏76 KB
code for project.PNG ‏169 KB

Generate sine wave triggered by impulse?

Dear all,
i am new to this labview software and signalling field. Ineed help on the following assignment task.
- Generate a 50Hz sine wave triggered by impulse with decay rate of 6rad/s
I know it is a very simple program but i struggle to get the program done. Help would be much thankful.
Regards
Ken

Actually, no hardware is used, we just need to virtually generate a sample sine signal that is triggered from impulse from functions in Labview. It is for analyzation usage.
Decay rate is the signal will reduce by frequency of 6 rad/s or we put is as 6Hz for example.

Capturing min and max of a func. generated sine wave

I need to identify (in real time) the min and max values of a continuous sine wave (whose amplitude may vary). I need to capture the value of each min and max and the time of each such occurrence.

If the sine wave is in the form of a waveform data type, then all you have to use is the Waveform Min Max function. This does all that you want including returning the time values. There's even an example under Help>Fundamentals>Waveforms>Waveform Operations.

Generate Sine wave using NIDAQ

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