How the ND_SCANCLK_LINE signal used in DAQmx? It is complete Hold event?

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  I use the card to make an acquisition of data simple PCI-6221.  The idea is to allow three different analogue voltages trigger the State of data acquisition.  I currently put code in place for a trigger voltage but I'm not sure what to do to add two additional trigger voltages. Any ideas?

  Thank you.

  Hi capncane,

  The 6221 is not able to do an analog trigger so DAQmxCfgAnlgEdgeStartTrig will not work for your card. Is your relaxation a digital signal? If so what kind of logic level is? If it's TTL, you can use the PFI lines. If this isn't the case, you need to trigger as I mentioned in my previous post.

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  Thank you!!

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  Hello

  I'm following link below to show/hide my columns dynamically. See "formatting of column.

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  <LIST_GH4>
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  I intend to use it under condition in RTF model to hide the column, but do not know how to set the column as PRIVATE/PUBLIC type in the XML output that is used to populate the data in the RTF while running.

  <?if@column:/BTSPIEXP/LIST_GH3/@type=”PUBLIC”?>COLUMN_HEAD3<?end if?>
  

  Kind regards

  Patricia K.

  Hello

  Problem has been resolved. I used the value of the item to determine whether to show it.

  Kind regards

  Patricia K.

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  Yes, you made a few mistakes or bad assumptions about who express vi.

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  Hi all
  
  In one of my server have 148 GB of total physical memory and 12 databases are running. For capacity planning, I need to know how the Oracle server use.
  
  How to calculate the use oracle database? I was perplexed because Yop out his show off 148 gb 128 GB are used.
  
  Below for your reference:
  ++++++++++++++++++++
  == > back to top
  top - 09:52:32 up to 151 days, 15:20, 3 users, load average: 6.11, 6.00 6.05
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  4 GB 4 gb
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  2 GB, 4 GB
  2 GB, 4 GB
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  Thank you

  Try this - http://www.pythian.com/news/29703/oracle-instance-memory-usage/ for each of your instances.

  As far as I know, different instances may share only the binary code oracle and using libraries, so you should be able to easily understand the amount of memory of all instances of 12.

  Lordane Iotzov
  http://iiotzov.WordPress.com/

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  Hello everyone

  Is there anyone who knows the algorith or can give me a vi that shows how to perform deconvolution of the two functions by using the FFT. Using labview for deconvolution, the suggested algorith is.

  1. Calculate the Fourier transform of the input sequence X * Y.
  2. Calculate the Fourier transform of the input sequence Y.
  3. Divide the Fourier transform of X * Y by the Fourier transform of is. Call the new h sequence.
  4. Calculate the inverse of Fourier of h to get the deconvolved Xsequence.

  I tried to do e same but did not work. I enclose a Vi in first, I bypassed a pulse-to-pulse-triangular square. Then I deconvolutee the convoluted signal using a triangular pulse with deconvolution tool in labview. Then, I tried to do the deconvoltion using the FFT algorith but did not work. Y at - it someone who has an idea on how to perform deconvolution using FFT.

  Regrads

  Charles

  Hi Charles,

  It should work to 8.5.  Let us know if you still hurt to open it.

  -Greg J

• How to control the mouse cursor using EEG signals

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  I am doing a project of cursor control using EEG signals. The idea is to find a way to all signals in a specific period of time in order to find the signal Ridge. Then, the highlight will be a parameter to control the position of a cursor.

  Can someone tell me the function that allows you to control the mouse cursor?

  I also found an old topic asking about it (http://forums.ni.com/t5/LabVIEW/Moving-Mouse-using-Labview/td-p/1285842) and I run an example of this link ( smercurio_fc) program. My cursor is stuck in the upper left corner of the screen, I can't control it again. Can you tell me how to run this program and to use the windows API?

  Thank you in advance.

  Sorry, but I can't do it for you.

  As I advised, you should take the free online tutorials. You clearly lacks the basic concepts of LabVIEW, as data flow.

  Things more: in your real applicaton does not use DAQ Assistant, screw Express are generally not optimal for data acquisition. It is safer and better use good DAQmx live. What is the equipment you use? Sampling rate, etc.?

  Why do you need to read data files? For testing? I thought that you will acquire data active, right? In your VI generate you some signals and write in a data file. Is this also for testing?

  There are several constructs in your VI which simply don't make sense.

  So again, I really suggest to go through online Core1-2 teaching material, which is accessible if you are a student, or if you have shared services provider license... It will really help.

• How can I use the USRP to record a signal using its two RX ports simultaneously?

  Hello.

  I am trying to record a signal using two antenna cone. The reason that I need two antenna to cover the bandwidth (DC - 6 GHz). a single antenna covers DC - 300 MHz and the other covers 300 MHz to 6 GHz. so I need to use two RX port of USRP at the same time to record the signal. I have two questions:

  1. is this all USRP market capable of covering this frequency range?

  2. is it possible to use the two RX port at the same time to the signals of the records I described? If this is not the case, how can do?

  P.S. I have two NI2920 USRPs and two USRPs N210 in my lab.

  Thanks in advance for your time.

  Sam.

  Hi Sam,

  To answer your first question, the USRPs you can reach the bandwidth you want. There is not a USRP, to my knowledge, that can reach this range in a single device.

  Also note that you can only use RX convened for two different ports at the same time using LabVIEW and the pilot of the USRP. If you want to use the two lines of RX, you will need to run a session with a single line, close the session and then start a different session for your second RX line.

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  I have problems with my code. My entry is an EMG signal that I gather from three different electrodes using usb 6008. In the program, I divide the signals and display them in a chart that is unique. What I want now is to read the signal, and if a signal passes a threshold I want an LED lights. This must remain lit until there is another signal that passes the threshold.

  To put it simply: "large enough signal--> lamp on--> stay informed--> enough large signal--> lamp--> stay off the coast and then start again."

  I tried a few different approaches, but I decided using a state machine. Now, the problem is that when the signal to enter the state machine the program crashes. I think it's because the table that I use to convert the signals does not update when I get my state machine, so the signal stops to come. But how to get around this problem? It is even possible to code what I want?

  I have attached the code. All the tips are welcome, I have been struggling with this for some time now.

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  jenmich

  The problem is internal while the loop is run until the stop condition is true, but he never does a new Boolean entry. So that it remains for always in the same State. Remove the inner loop and put the shift register on the outer loop instead.

  You must also use a daqmx configures the element, and then set the properties of daq. The read.vi can be set to read a number of samples of each iteration.

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• How to choose destinations for counter/timer signals in NOR-DAQmx?

  In the document M Series DAQ
  M series user manual
  622 x, NI 625 x and the materials NOR x 628
  M series user manual
  July 2008
  371022K - 01

  appears on page 7-30:

  Counter/Timer default pinout
  By default, NEITHER-DAQmx routes counters/timers and outputs inputs to the PFI pin, shown in table 7-4.
  Table 7-4. 68 peripheral pins by default Counter/Timer pines NOR-DAQmx
  Counters/timers fail-safety connector 0 PIN (name)
  0 2 CTR (PFI 12)

  You can use these default settings or select other sources and destinations for the
  counters/timers of NOR-DAQmx signals. Refer to the connection counter signals
  in the NOR-DAQmx help or the help of LabVIEW in version 8.0 or later for
  more information on how to connect your signals for common counter
  measures and generations.

  I couldn't find any hint to the appropriate command of DAQmx in the "NOR-DAQmx C reference Help" to select other destinations for counter/timer signals in NOR-DAQmx.
  Please can you tell me the DAQmx command right? Thank you very much.
  I use the NI USB-6259 M material Series DAQ, BNC end unit.

  datafriend,

  If I remember correctly, you can "free" the output terminal of default counter by calling DAQmxSetCOPulseTerm and passing an empty string in the 'data '.

  Hope that helps,

  Dan

  Edit: You can also set this to any other valid terminal (IE... "Dev1/PFI0") and to send the output to.