Can we design analog to digital signal conversion block diagram (ADC) in labview

hi every one,i've doubt i.e can we convert function generator output (i.e analog signals) to digital signal in labview......can anyone help me how to create ADC circuit that means ADC Block Diagram in LABVIEW.....please give me solutions for my problem

Hi guru,
from signal generation VIs you get arrays containing float values (aka DBL). Those floats are just digital values made of 0s and 1s…
Any value in your computer is digital!
To provide a solution you need to rephrase your question! What exactly do you expect as result of your operation?
Edit: kkkkkkk ur ckt ???
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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You went a little too far. the while loop I was talking about was the one around the digital write. You've now taken the digital write completely out of the loop and closing it. You can't do anything with the digital when the analog in is running. You've also closed the analog write while the analog in is running. The attached is more like what I was talking about.
Even with the diagram cleaned up, it sounds like you still have a problem. I don't know the details of your hardware setup but I would start by looking at the analog signal you are generating and verifying that it is correct to your hardware. It would help if you had a scope to troubleshoot. If the signal is correct to the hardware, then trace it through to the connection to the DAQ's analog input. If it's correct there and you still don't see the signal, then you may have wired up the DAQ incorrectly. You haven't specified the connection type (differential, RSE, etc) and I believe it will default to differential.
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Single Channelv 2_mod.vi ‏535 KB

Urgent Help! How can i execute in the same block diagram two separate labview codes each one with diferent execution timings?

Dear All.
I have 2 application progrlams in the same block diagram. the intention is to use the 2 programs at different excuting time for different application, and each have stop and start button ofcourse i will have master stop. But when i run the program, it only works one program at time , that is the 1st block which i make it active only , when i tried to make active the second block it will not work, only works when i stoped the1st one. So, this it to request ur hlep how can i solve my problem. here i have attached some of my program.
Regards!
Solved!
Go to Solution.
Attachments:
2_block application.vi ‏14 KB

Usually you set up a task that has all the channels from all the modules configured. When a loop starts it reserves that task and the cDAQ can't be used by other loops unless you start and stop tasks.
You can have one loop acquire all the data and if you want certain channels to go to other loops you can use the producer/consumer design pattern. If you wanted a third loop you would add another queue and the third loop would dequeue that data. See attached.
Eric
Attachments:
prod-cons.vi ‏69 KB

How can I open a vi and show the block diagram?

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OK, I can come up with a reason. I have written a program that will search the entire VI Hierarchy of a program and update all of the descriptions for all VIs with the top level program part #, the name of the top level program that the VI is used in, the company copyright info, the ITAR notice, company address, the name of the engineer performing the update, along with the date and time. This will also place as a background image on all the VIs, a watermark of the company name, legality stuff and the copyright. It works very slick in that if there are thousands of sub-vis, such as what I'm working on now, it goes through all of them, makes sure the data is there as per company policy without having to open every one of them look at them and update or not whichever the case may be. The one portion that is tough is that the program will detect if there is a description written about what funtion the VI performs and if there is not a description, then it pops up a dialog requesting the user to write a description. The problem is that without looking at the block diagram for the VI, it can be nearly impossible to write a description for the functionality of the VI. So is there a way to programmatically open a VI, show its block diagram (this would only be in the case of a missing description) and then upon completion of the updates, close the block diagram? (I already open and close the VI programmatically in order to read the VI DESC and update as needed, but that is in the background and of course you can't see the block diagram).
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Analog to digital video conversion

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How can i execute in the same block diagram two separate labview codes each one with diferent execution timings?

Hello guys. I have been trying to solve this by a long time now...but i cant solve it....
I have my main code in labview beying executed in one timed loop of 1second.....but now i need to pulse a lazer very fast than one second...
my ideia was like executing the lazer pulse code in paralel with the main code but with a mutch faster timed loop....but when i put the second timed loop outside of the main one....it hapens that the aplication keeps runing only the faster loop and the main loop doesnt run....
I really dont know how to solve this....
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JOSE

JOSE,
your code is really difficult to read. Please do some cleanup work, your diagram should be only little larger than an average computer screen. What I have glanced so far is that your code has a lot of beginner mistakes (overuse of local variables).
For multi-loop applications, you shoul have a look at the tutorials concerning Producer-Consumer design pattern. The quick and dirty approach is to use locals (a bit contradictonary to suggest using locals here after I stated an overuse of them). The drawback will be, that you lose the latch mechanism of the button and must code it on your own (and make a big set of mistakes, using locals always attracts race conditions). Most important is that you write to your button only once, after all loops have finished spinning.
Felix
www.aescusoft.de
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Attachments:
act04-02.vi ‏41 KB

.WAV is a digital "signal". It uses Pulse Code Modulation to encode analog signal. You don't need a DAQ device to "convert" it to analog. Any computer with a sound card, and media player can "convert" a .wav file to the analog audio signal it represents
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Error -89137 occurred at DAQmx Start Task.vi:3
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Source Device: PXI1Slot2
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Export Waveforms To Spreadsheet File (1D)_wo extra line.vi ‏33 KB
Multi-Device Synch-Analog Input-Finite Acq-Analog Start_Claire_wDigitalin.vi ‏105 KB

Hi ClaireJ,
Sounds like a reference clock conflict. This KnowledgeBase (KB) talks about this error when using simultaneous sampling. Also, might want to check the device routes in Measurement and Automation Explorer (MAX) as discussed here. Finally, if you are routing your PFI line over a RTSI connection, this error can occur. This KB discusses it.
As to your second question, this post should help.
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Hi again ftts (having a little trouble pronouncing that)
I went to the Sony web site and simply downloaded the operator's manual for that camcorder...
http://esupport.sony.com/US/perl/model-documents.pl?mdl=DCRPC350
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How to convert digital signal to analog

Hi..
I am using NI 9375 (DIO module) to read the output from flow sensor.
The output of the flow sensor is in the digital signal.(Boolean=True/False).
How can I convert the digital signal to the analog to get the reading of the flow sensor?
I had tried before to convert the digital signal to the frequency so that I can make the conversion from frequency to the flowsensor reading,
but it doesn't work.( I am referring to http://www.ni.com/white-paper/14549/en/ ).

nhan91213 wrote:
Hi..
I am using NI 9375 (DIO module) to read the output from flow sensor.
The output of the flow sensor is in the digital signal.(Boolean=True/False).
How can I convert the digital signal to the analog to get the reading of the flow sensor?
I had tried before to convert the digital signal to the frequency so that I can make the conversion from frequency to the flowsensor reading,
but it doesn't work.( I am referring to http://www.ni.com/white-paper/14549/en/ ).
FYI - If your flowmeter pulsing frequency is higher than 500Hz then you won't get reliable reading using your algorithm, and it will be very unreliable above 1kHz because fastest that loop runs is 1mS (1kHz). In that case you could tie the timed loop to a higher rate (hardware) clock source to go faster than 1mSec loop time. If no hardware then I think you can use high resolution timer (in LV2014, not sure if it was also available in previous version) and a regular while loop with algorithm modification for a faster timing.
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Advice Wanted: Analog to Digital Conversion

I have a load of Hi8 tapes requiring analog to digital conversion.
My initial thought was to buy a Canopus ADVC-110 for conversion and transfer into Final Cut Express. However, once converted, I would never use the device again (because I would buy a digital camcorder for future use).
Alternatively, I could buy a top-of-the-range Sony Digital8 camcorder for a similar price to the Canopus ADVC-100. This has the ability to play-back and convert Hi8 tapes for transfer to Final Cut Express. The problem is that Digital8 is a dated format.
Third, should I instead buy a MiniDV camcorder, and use my existing Hi8 camcorder connected to the MiniDV and transfer from Hi8 to MiniDV?
Does anyone have experience of these alternative solutions, and what is the better solution in terms of ensuring quality of video transfer?
Also, from what I've read elsewhere, is Firewire still a preferable transfer method over USB?

I have both methods covered.
I have found that using the ADVC-100 gives better results, especially as I time base correct the Hi-8 first with a standalone TBC from GTH electronics.
The Hi-8 in a Digital-8 camera works OK, but clips the peak whites a little, losing some detail in any over modulated footage. I can tweak the vision signals, with the GTH TBC first, to avoid this.
I now use the ADVC as a digital converter for recording television programmes, and I can use if necessary (though not strictly legally) for nabbing clips from DVD or VHS for some home movie fun as my GTH removes the macrovision pulse.
On the camcorder front I would always opt for Digital-8, here's why.
Mini DV had significantly reduced head life compared to Digital-8, and has always suffered from compatibility issues between machines, thus footage shot on one camcorder will not necessarily play on another.
In my job I have encountered many problems because of this. Also, Mini DV tapes should only ever be used for one recording. They are very fragile and prone to slight stretch and many drop outs. They are not to be considered for archive purposes or data backup.
Digital-8 on the other hand copes well with old Hi-8 tapes I had long ago consigned to the no good pile. The transports are very stable, being based on proven video-8 technology, and the heads seem to last for ever!
I have abused my Digital-8 camcorder (a DCR-TR7000E) for 6 years, its been on my motorcycle tank many times, and despite being shaken about like a monkey on a spin cycle, give consistently perfect results. I cant remember losing any footage through drop outs. I also use for data back up (using DV backup) of very valuable files, tape still having the longest shelf life of currently available large storage media.
The digital 8 camcorders are rather larger than Mini DV, but if you are serious about video then a tiny camcorder will not be required.
If you are entering the semi-pro arena, and require a high quality front end camera on the camcorder you will be stuck with mini DV. However I get near broadcast quality footage from my D-8, with nothing more than a circular polariser stuck on the front.
Note also that some mini DV camcorders do not have an analogue recording capability, even if they have DV in enabled.
Firewire is better than USB2.
Sorry about the length of this post, but I am passionate about video formats (its my job) and am annoyed when inferior formats win out.
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Powerbook 17", 1.67 Mac OS X (10.4.3)

MyDAQ - Generating a digital signal and displaying it on an analog waveform graph

Hi,
I am using the NI MyDAQ to generate a digital waveform with an adjustable frequnecy. This is being implemented into a program I have already written which generates a TTL "like" pulse out of the sound card. I am displaying the output on an analog waveform graph, and I'd like to be able to display the digital waveform generated by the myDAQ on the same graph. (Not at the same time, either one or the other, toggled by a button). I've been messing with arrays and conversions but I cant seem to really get anywhere with it all.
This is the vi I have made to generate the adjustable frequency digital signal with MyDAQ. Any suggestions on the proper way to do this if the following is wrong would be great too as I just got the MyDAQ a few days ago. I would think there must be a better way but this is the best I could come up with so far.
Solved!
Go to Solution.

Hi Jonny,
The general logic you are using to create a digital pulse train is fine. This VI you've written should work and will create the pulse train based on software timing (which is fine because you don't have hardware-timed DIO on the myDAQ anyway). However, it is usually good practice to start the DAQmx task just before your while loop and then clear the task after the while loop when you press stop.
For reference, there are some pretty good LV examples that I recommend looking at for this application too. If you are just trying to create a digital pulse train, the example Gen Dig Pulse Train-Continuous.vi is a good example that uses a counter to create a digital pulse train of your desired frequency. This is generally the prefered method to create a pulse train if you have the hardware available to do so (the myDAQ does have a counter). Alternatively, there are some DIO examples that continuously write to a digital line/port.
If you're not familiar, you can find the examples by going to Help >> Find Examples... in LV. Then, navigate to Hardware Input and Output >> DAQmx >> Generating Digital Pulses or Digital Generation.
Also, here is some additional information about the myDAQ and its counters:
myDAQ Counters
myDAQ Manual
Hopefully this helps.
Chris G
Applications Engineer
National Instruments

How to input/output a digital signal and acquire an analog signal at the same time?

Dasylab, version: 8.0.04
Acquirement Card: PCI1002L
When I use DasyLab to acquire the analog signals is no problem without digital inputs and outputs,
and when I use DasyLab to input or output a digital signal is no problem also, but when I do that at the
same time, DasyLab tell me the rate is too high and stop.
so, I searched the manual book1 (user guide) for that, it showed me :
To internally equalize measurement time and system time in the analog input, digital input and counter
hardware modules, use the following settings:
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   Sampling rate: <= 5Hz
   Block size: =1
the problem is, if I set the Sampling rate to 5Hz, the speed of the acquirement datas is not enough for my
application.
so, how to improve it? who can give me a example programm for me. thanks!
by the way, I come from China, my English isn't good, I'm sorry.
Allen, China.

Hi,
Have things changed over the years?
I need to syncronise a digital output (Modul NI9474) and an analoge input (AI-Modul NI9203) module. I need to measure time intervals from a flank in signal A to a flank in signal B. I would like accuracies of the order of 1 ms. Currently, the signals are not synchronised, with errors of the order of 2 times the block length (block size x sample rate), sometimes much higher. The best I got so far was a block size of around 20 with a sample rate of 1 kHz.
If I use the master and slave settings on the RTSL settings, my program doesn't run properly.
If I use digital signals for input and output, I can syncronise them with RTSL settings and everything is good, but I can't always do that.
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Can we design analog to digital signal conversion block diagram (ADC) in labview

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