Increase sample rate analog output

I have a PCI-6221. I am trying to output an sine wave from my computer. The voltage output changes only once every 1/10 sec. I there a way to increase the frequency? Attach is sample program and a resulting graphs.
Attachments:
SINE_OUT.vi ‏368 KB
Sine.JPG ‏29 KB
Sine_1.JPG ‏25 KB

You seem to have found one of the more convoluted methods of generating a sine wave. Have you looked at any of the example programs? Go to Help>Find Examples and for Hardware Input & Output>DAQmx>Analog Generation, look through some of them.
You major problem is trying to generate it one point at a time with the single sample mode of DAQmx Write. Not at all sure why you are using the Elapsed Time function or the Mathscript. There are built-in functions (even an Express VI) to generate a sine wave.
p.s. You have also posted to the wrong board. This has nothing to do with Counter/Timer hardware.

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Setting sample rate for sinus analog output

Hello,
I've been trying to do something very simple : using an analog output of the card PCI 6221 to produce a sinus curve of frequency 50 Hz. For this I used a Vi to create a sinus curve and the different DAQmx VIs. But I have difficulties understanding the principle of virtual channel and I think I'm doing a mistake setting the sample rate and samples number : one time for the sinus vi, second time for "DAQmx - Timing". Should I use the same values for both of these VIs ?
On my oscilloscope, with frequency=50Hz and sample rate=1kHz, I get a null signal. Then depending on both values, I get differently rated signals. For example with f=1Hz and sr=10kHz, a sinus of frequency 0,7 Hz.
Solved!
Go to Solution.
Attachments:
Sinus analog output.vi ‏32 KB

Yes, thanks for your advice. I used the structure given in the example and now it's working fine. I'm still not sure what I did wrong though.
I would have a second question now (should I create a new topic?):
I put a continuous sine wave on the analog output. As soon as this is running, (or maybe after a short delay) I want to measure a limited amount of samples on my analog input. How can I be sure, it's not going to start measuring before the output is properly set ?
I don't think a trigger would solve the problem since I'm going to vary the output Amplitude.

Different Sampling rates for different channels in Analog Input

Hi,
I would like to acquire data at different sampling rates on different channels say ACH 0, ACH 1 and so on. I have a PCI 6052E board and NI DAQ 6.9.2. Also is it possible to simultaneously perform Analog output on two different channels along with the Analog input? What will be the problems/consequences as far as the system resources are concerned. I am a beginner in this area and would greatly appreciate any help/pointers for my queries.
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Search the eaxamples that ship with LV.
Theer is one called simultaneous input and output or something like that.
It will get you started.
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Solved!
Go to Solution.

Hi ykhali,
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