write sine wave onto DAQ card AO

[Keqin]

Hi all,

    I am using a NI-DAQ card 6009, and I am trying to generate a sine wave from LABVIEW 8.5 and then output it to the analog output of the DAQ card.

    The code I wrote was pretty smple. Generate a sine wave using "create analog signal", and then connect the sine wave to the "write" function DAQmx. The output of the "write" function goes into the task in of "DAQ assistant" outside of the loop.

    But I'm getting error message as follow:

    Error -200077 occurred at Property Node DAQmx Timing (arg 1) in DAQmx Timing (Sample Clock)

    Property: SampTimingType
    You Have Requested: Sample Clock
    You Can Select: On Demand       

    Settings regarding to sample timing in each of the 3 componets are:

    Creat analog signal: sample rate: 10K, block size(samples): 100

    Write: Analog, single channel, multiple sample, waveform

    DAQ assistant: timing settings:

                            Generationg mode: N samples

                             Samples to write:100

                             Rate(Hz): 10K

    Any help will be appriciated.

    Thanks.

Colin

[Dennis_Knutson]

Have you looked at the specs of the 6009 or done a search of this error? It has no sample clock. The analog output is strictly software timed (On Demand). You have to write one sample at a time. As the specs say, you will have an update rate of about 150 Samples/sec.

[DianeS · Accepted solution]

You are seeing this error because the 6009 does not support hardware-timed analog output.  Did you look at the device's spec sheet?  It would appear not.  Here it is:

Note that the maximum rate listed is 150S/s, and it is specified to be software timed.

So what you are trying to do is not possible with the 6009.  You'll need a 6221 or something similar.  Make sure whatever board you choose supports hardware-timed analog output at a rate fast enough for what you're trying to do.

Edit:  I see that Dennis beat me to it!

Message Edited by DianeS on 01-20-2010 04:04 PM

[nolsqn]

hi

change 

samples to write to 1

and

rate(Hz) 150

regards

[Dennis_Knutson]

---

nolsqn wrote:

hi

change 

samples to write to 1

and

rate(Hz) 150

regards

---

No. You cannot use anything that sets the rate.