square pulse generated with the NI PCI-6723

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  Hi Jason

  Has BNC-2090 is specifically designed for the X-Series, E-series, M-series and S-series.
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  I have a piece of code that worked successfully on the PCI-6224 map, but when I tried to implement the same code on the card PCI-6723 I ran into problems.

  Here is the code I use:

  ManchConversion6723();//produces SendIt array of series of 1s/0s
  
  // DAQmx Configure Clock
  DAQmxErrChk (DAQmxCreateTask("",&taskHandleFRQ));
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  DAQmxErrChk (DAQmxCfgImplicitTiming(taskHandleFRQ,DAQmx_Val_ContSamps,72));
  
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  DAQmxErrChk (DAQmxStartTask(taskHandleFRQ));
  DAQmxErrChk (DAQmxStartTask(taskHandle));
  

  When I get on the DAQmxCfgSampClkTiming line, I get an error stating:

  DAQmx error: measurements: request the value is not supported for this property value.

  PropertyAQmx_SampTimingType

  You asked: DAQmx_Val_SampClk

  You can select: DAQmx_Val_OnDemand

  Task name: _unnamedTask<0>

  State code:-200077

  I think that the problem comes from the variable of the source of the function. I'm just tring to send the data to the frequency of 20 kHz.

  Any help would be greatly appreciated. Thanks in advance!

  Too bad. The impression that the PCI-6723 does not contain correlated DIO channels. In other words, examples of clock cannot be linked to the DIO channels allowing the generation of digital waveforms. According to the AO Series user manual, this applies to the NI 6731/6733 only. The mistake was trying to tell me that only a single issue or receive channel has been authorized.

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• PCI-6723 at 100 kHz

  Hi all

  I use the NI PCI 6723 Analog Output card with SCB-68 connector housing. Specifications of the PCI-6723 tells this unique channel of sampling frequency (refresh rate) maximum is 800 Ksamp/s. I tried t0 generate sine wave 100 KHz using single channel only in continuous mode with + / 10V range defined using Labview Signal Express application, however, output of the DAC was very distorted (a kind of triangle instead of waveform sinusoidal waveform) and amplitude of output even reduced to about 2 or 3 V and becomes not symmetrical (i.e. not centered around 0V).

  Then I found that the generation of signals up to 20 kHz, output DAC was very well without any distortion amplitude or form, however as I go beyond 20 kHz (with constant update of rate of 800Ksamp/s) to 100 KHz, CAD production has started to become more, and most corrupt.

  Kindly tell me if NI PCI-6723 is sufficient to 100 kHz signal output if I use only single channel?

  And if so, what can be the reson for this distortion?

  Thank you

  Best regards

  Asim

  It seems that you exceed the maximum scanning speed for the card, which is probably why you see distortion on your waveform. Scanning speed is defined as the maximum rate of change of output voltage per unit of time. The map (from the manual, link below) has a maximum speed of scanning of .7V / us, you are exceeding that by a significant margin.

  NEITHER 6722/6723 specifications

  http://www.NI.com/PDF/manuals/370822c.PDF

  To resolve this problem, you can either reduce the frequency of your signals output, or you can decrease the amplitude of the wave. the two changes will reduce the scanning speed. You will need to reduce one or the other enough will be the maximum scan rate specified map.

  So, long story short, the card is not able to produce a sine wave of full scale at 100 kHz due to the limitation of the maximum scanning speed. You should be able to output a signal 100 kHz if you reduce the amplitude of your waveform.

  Kind regards

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