I have generated two square wave forms using NI-9221. These two Square waveforms are suppose to be 90 degrees electrical from one another.

I have two square wave forms from an encoder wheel. I can not seem to generate or calculate the phase of the waveforms. I have tried to extract the data but it is not accurate? I can not use a true false statement with the extracted data either. I have to have the one waveform 90 degrees electrical from the other waveform. Any Suggestions?

Fist thank you both for responding so quickly. I am using a half encoder wheel and the waveforms are certainly show the phases correctly. The operator of this program will not have access to the graph only the data and measurements collected. The reason I am trying to get the phase is because that is going to be a major factor in if the board passes or fails. I extracted the phases from the waveforms but it’s not accurate at all. I think I may try to trigger when to measure the wave and when to stop measuring. Is that Possible?
J. Powell

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Here it is in question form
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In many so ways . Currently I own the Ipad 1 and 2 Let me tell you now the ipad 2 camera ***** compare it to the iphone 4
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I am using an NI PCI 6024 E board device for an analog output application. Can I generate two independent waveforms, one on each analog output channel?

I am using an NI PCI 6024 E board device for an analog output application. Can I generate two independent waveforms, one on each analog output channel? In attach I send a example of my vi to control one chanel, but i need to control both but with diferent waveforms.
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Generating a square waveform of 100 KHz from one of the Anolog output channels of PXI-6713 ?

Hi
I am trying to generate a square waveform from one of the anolog output channels of PXI 6713.
I am developing my application in VC++
My requirement is a continous 100 KHz square waveform with 90% duty cycle and 1.5 V amplitude.
The following is the code i have used (i have removed error handling code):
***** code *******
i16 deviceNumber = 6; // PXI 6713 Device Id as per NI-MAX
i16 deviceNumberCode; // to be returned by Init_DA_Brds function
i16 chan = 2; // DAC channel 2
i16 numChans = 1; // only one channel is used for
i16 chanVect[1] = {2}; // DAC Channel 2
f64 gain = 1.0;
i16 binArray[10] = {0};
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u32 count = 10; // 10 data points
// 9 data points ON and 1 data point OFF constituting 90% duty cycle
f64 voltArray[10] = {1.5,1.5,1.5,1.5,1.5,1.5,1.5,1.5,1.5,0};
u32 iterations = 0; // Repeat waveform indefinitely
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f64 rate = 100000; // 100,000 points / sec
i16 units = 0; // points / sec
i16 timebase;
u32 updateInterval;
i16 whichclock = 0; // update clock
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WFM_Load (deviceNumber, numChans, chanVect, binArray, count, iterations, mode);
WFM_Rate (rate, units, &timebase, &updateInterval);
WFM_ClockRate (deviceNumber, group, whichclock, timebase, updateInterval, mode);
WFM_Group_Control (deviceNumber, group, operation);
If I try to generate 10 KHz waveform with the same 90% duty cycle and 1.5 V amplitude, the waveform gets generated continously....
But for 100 KHz, itz generating continously....but only few waveforms....
Is there any hardware limitations ? I've tried changing the value of the timebase ( points / sec) and update interval etc...
plz help me
thanx in advance
sriram.

Sriram;
The best way to get started is to run one of the NI-DAQ shipping examples. You can find a good example at
C:\Program Files\National Instruments\NI-DAQ\Examples\VisualC\Ao. Take the one named WFMDoubleBuf.c.
On that example, you will just need to change the data written to the buffer to met your application's pulse train requirement.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments

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How to generate two signals using NI myDAQ

Dear Sir:
I designed a circuit to generate a sine wave successfully using Labview. What I want is using NI myDAQ to generate another 3V DC signal as a power supply. I can do this seperately but when I add them together there is an error: NI Platform Services: The specified resource is reserved. The operation could not be completed as specified.
I would like to use A01 to generate a sine wave and A02 to generate a DC wave, could you please check my file and tell me how to solve this problem. I found a solution which generates two signals together but what I need is to control these two signals seperately and using two channels.
Kind Regards
Jeff
Attachments:
signal gen and acquire.vi ‏126 KB

Thanks very much for your kind reply.
No. I tried for a long time, change the samples of each simulate signal to the same but the warning also came out. Could you please check my file and tell me how to solve this kind of problem?
Kind Regards
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I have generated two square wave forms using NI-9221. These two Square waveforms are suppose to be 90 degrees electrical from one another.

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