Compact Daq or Rio measurement signal and datalog

Similar Questions

• Align the two signals and measure the Phase Shift

  Hello

  I do an experiment in which I use the NI USB-6221 DAQ card. The jury is able to make 250 k samples/second. I want to measure two voltages in a circuit and find the phase shift between them at frequencies between 1 and 10000. First I ouputted a wave sinusoidal frequency variable through the Commission and applied to a test circuit. Then I used the Board to measure the two tensions consecutively (thus reducing the maximum sampling frequency at 125 k). I used the signals align VI and measured the two phases and then calculates the phase shift (VI attached in Phase 1). It worked well for the test circuit I built in which the phase shift went way logarithmique.20 degrees ~84.5 degrees and then stabilized. At frequencies above 5 000 Hz phase shift must have remained constant, but it varies more or less 1 degree. When the phase shift is 84.5 degrees, present a degree of variability is not particularly explicit. When I asked my program on the circuit that I really wanted to measure, the phase shift went from-. 5 degrees up to about 1.2 degrees. The change in the values of phase shift at high frequencies (> 3000) was environ.2 degrees. Given the small phase shift, this variation is unacceptable. Now I tried to use a sequence to each blood individually (increase the maximum sampling frequency to 250 k) and then align the two signals and measure the phase of each shift. When I use align it and re - sample Express VI to realign the two signals, I get the message "error 20333 analysis: cannot align two waveforms with dt even if their samples are not clocked in phase." Is it possible to align two signals I describe here? I enclose the new VI as Phase 2

  Matthew,

  I think I have an idea for at least part of the problem.

  I took your program data and deleted stuff DAQ.  I have converted the Signal on the chart control and looked then what was going on with the signal analysis.

  The output of the Waveforms.vi line has two waveforms, like the entry.  However, arrays of Y in the two waveforms are empty!  It does not generate an error. After some head scratching, reading the help files and try things out, that's what I think is happening: the time t0 two input signals are 1,031 seconds apart. Since the wavefoms contains 1,000 seconds of data, there is no overlap and may not align them.

  I changed the t0 on two waveforms are the same, and it lines up.  The number of items in the tables is reduced by one. Then I increased the t0 of 0.1 seconds on the first element. The output had both greater than the entry by dt t0 t0 and the size of the arrays was 224998.  Reversing the t0 two elements shifts the phase in the opposite direction.

  What that tells me, is that you can not reliably align two waveforms which do not overlap.

  I suggest that you go to 2-channel data acquisition and that it accept the reduced sample rate.  You won't get the resolution you want, but you should be able to tell if something important happens.

  You may be able to improve the equivalent resolution by taking multiple steps with a slight phase shift. This is similar to the way that old oscilloscopes of sampling (analog) worked. Take a series of measures with the signal you are currently using.  The make enough average to minimize changes due to noise. Then pass the phase of the signal of excitement to an amount that is smaller than the resolution of phase of sampling rate and repeat the measurements.  Recall that I calculated that for a 5 kHz signal sampled at 125kHz, you get a sample every 14.4 degrees. If shift you the phase of 1 degree (to the point/mathematical simulation), you get a different set of samples for excitement.  They are always separated by 14.4 degrees.  Take another series of measures. Transfer phase another degree and repeat.  As long as your sampling clocks are stable enough so that frequency does not drift significantly (and it shouldn't with your equipment), you should be able to get near resolution of what you need.  The trade-off is that you need to perform more measurements and may need to keep track of the phase shifts between the various measures.

  Lynn

• I am facing a problem with the beep.vi. I have a DAQ program, which acquired the signal and compare it to a threshold value. When a signal is out of range, a Visual and sound alarm has occurred. I use the VI beep.vi to generate the sound.

  I am facing a problem with the beep.vi.  I have a DAQ program, which acquired the signal and compare it to a threshold value. When a signal is out of range, a Visual and sound alarm has occurred. I use the VI beep.vi to generate the sound. Everything works fine except the sound alarm. It gives the table 1 d of type mismatch. I tried to fix this by placing it in a box structure. But it still does not work. If someone could help? Please find attached my VI. Best wishes to all visitors to the Forums of Discussion OR.

  Ihab El-Sayed

  published here: http://forums.ni.com/t5/LabVIEW/Playing-sound-based-on-exceeding-a-threshold-value-1D-array-data/m-p...

• Use PFI0 on Compact DAQ 9178 chassis as input event

  Hello

  I have a Compact DAQ Chasis 9178, and I connect a 5V input signal.
  By a detector detector.

  I want to use the Signal in Labview. It is possible to convert this signal to a Boolean true or False?

  I want to read this signal directly from my VI.

  Thank you

  If you have assigned your meter indicator in the Subvi to the connector pane?

  If you don't know, what is the part of the connector, and then search for 'Connector components, assignment of the terminals' in the help of LabVIEW or look here.

  http://zone.NI.com/reference/en-XX/help/371361J-01/lvconcepts/creating_subvis/

  If this isn't your problem - you must be a little more specific. How do you want that the main VI to "receive" the data, how did you program it to do?

• Muliple USRP RIO 2943R, synchronization and phase-locking problem

  I use 8 USRP RIO 2943Rs transmission of signal and receving (4 for Tx) and 4 for Rx I'm using the "signal-based" method for synchronization of all devices. And I did it. I tested the system the result is very interesting:
  1. when I put the sampling rate of less than 40MS/s IQ, I can obversve very good phase locked Tx and Rx signals (I use a sine wave CW for tests), please refer to video joint (locked 40MSs)
  2. BUT, when I put the IQ more than 60 MS/s sampling rate, I'll lose phase lock. Please refer to unlocked 60MSs. My goal is to run the system at 120MS/s
  I have doubt as to if the problem comes from two sides:
  a. the sync methed isn't fair
  b. OR, should I increase the clock that operates the loop 'In Streaming radio engine' in the FPGA VI. as shown in the following image.

  

  I would like to ask experts in the forum to discuss the solution of this problem.
  More information about my system setting:

  

  
  

• The difference between Measurement Studio and NiDAQmx?

  What is the main difference in Measurement Studio and NIDAQmx. I have a DAQ software, which was originally developed in Visual C++ 2003 M, who initially used Measurement Studio. Now, I want to replace involved studio by NIDAQmx latest version. It is Possible to do?

  Hello

  Measurement Studio is an extension for Visal Studio, which contains a variety of libraries for measurement applications as well as user interface such as graphics.

  DAQmx is the setting for hardware drivers for Multifunction DAQ devices of NOR. If you are using a DAQ card, you need this driver to access with any environment programming (LabVIEW, CVI, C, C++, .NET).

  This means that you can access the material, also with Visual Studio, which has no Measurement Studio installed. Although Measurement Studio is analyze and present the data acquired much easier.

  Kind regards

  Robert H

  OR Germany

• The difference between the strength of the signal and quality?

  Hi all

  According to the Cisco documentation

  Low RF signal strength does not mean the lack of communication.

  The quality of the signal is low means poor communications.

  If someone can explain to me the difference between the power of the signal and the quality of the signal?

  In accordance with my AP home I see that this signal strength is measured in numbers like 50% or 100%.

  But what is the quality of the signal and how to measure me?

  Thank you

  Mahesh

  Big question...

  First, let's look at the notion of signal quality and strength... Suppose for a minute you're front row at a rock concert right next to the speakers. Sound is loud, you can't hear anything else that scream. It is an example of a strong signal but poor quality.

  As for the signal and the noise of measurement or should we say quality of signal. Providers sometimes give you a % or dB scale when ranking signal. You can't really do headers or tails of the % scale because each vendor has % different measures. But check your access point, because you will be able to change in dB.

  Look at dBm. At the moment my client shows:

  Signal - 59 dBm

  Noise - 98 dBm

  The dB scale is simple. More PB the STRONGEST signal. You'll see - 59 of the signal is good, in fact, I'm about 50 feet from the AP. If you are under the ap you will get as a - 30ish. Noise, we do not want to be noisy, if we want to see the noise to-100. More low is the dB of noise as loud noise.

  So we're back out the example above. Next to the speaker, you're showing tell - 30dBm, but your noise can be as - 70dBm...

  Does make sense?

  Normally, you want to see your signal not exceeding 67 - not for voice or - 76 for the data. And your noise should be greater than-90.

• IPhone 5 s losing signal and MIC is muffled

  Hello guys,.

  My Rich Dad a 5s iPhone and it loses signal and muffled the sound when he talks about phone! Any solution before going to the apple service?

  Hello

  Try following the steps here in terms of sound not clear:

  Get help with microphones on your iPhone, iPad and iPod touch - Apple Support

  Follow the instructions in respect of the loss of cellular signal:

  If you cannot connect to a cellular network or cellular data - Apple Support

• USRP RIO as BS and EU

  Is it possible to use USRP RIO for BS and EU side? Several USRP Siu can connect to NBS?

  Hi varugantigopal,

  It is certainly possible to use USRP RIOs for the EU and the BS and for several Siu to connect with NBS. Our MIMO Massive reference design, for example, uses up to 64 USRP RIOs the BS and 6 USRP RIOs to the equivalent of 12 Siu.

• Should I purchase Measurement Studio and NI-IMAQ separately or NOR-Imaq included in measurement studio?

  
  

  Hi Vjuno,

  Thank you for your interest in Measurement Studio and NOR-IMAQ. Measurement Studio and NOR-Vision are separate software packages. If you are considering comes to acquire, save and display images from a camera IEEE our NI Vision Acquisition software located on our website (http://sine.ni.com/nips/cds/view/p/lang/en/nid/12892). If you want to set up a system of image analysis then you can buy the Module OR Vision Development, this includes NI Vision Acquisition (http://sine.ni.com/nips/cds/view/p/lang/en/nid/2881).

  Thank you for your interest in our products!

  Eric Reid

• How do I get the analog input signal and send it to output analog (real time)

  Hello world

  I do a simple task in Visual C++ and I use PCI-6221(37 pin).

  Basically, I want to send the same signal of "analog input" to the "analog output".

  at the same time (or almost), to make real-time application.

  Can someone provide me with sample program please.

  I would be grateful if you could provide me with the great tutorial that explains

  step by step everything about NOR-DAQmx for C/C++ programming.

  Best regards

  Khassan

  This is my code in C++, you can optimize it if that seems too messy. This code reads the analog input signals and exports it through the analog outputs.

  To make this code additional work of the directories include and library directories must be added to OR.

  I hope it helps someone.

  #include
  #include
  #include "NIDAQmx.h".
  #include

  #define DAQmxErrChk (functionCall) {if (DAQmxFailed (error = (functionCall))) {goto error ;}}

  int main (int argc, char * argv [])
  {
  Int32 error = 0;
  TaskHandle taskHandleRead = 0, taskHandleWrite = 0;
  Read Int32 = 0;
  float64 context [1000];
  char errBuffRead [2048] = {'\0'};
  char errBuffWrite [2048] = {'\0'};
  bool32 done = 0;
  Int32 wrote;

  DAQmxErrChk (DAQmxCreateTask("",&taskHandleRead));
  DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandleRead,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleRead,"",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,0));
  DAQmxErrChk (DAQmxCreateTask("",&taskHandleWrite));
  DAQmxErrChk (DAQmxCreateAOVoltageChan(taskHandleWrite,"Dev1/ao0","",-10.0,10.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleWrite,"ai/SampleClock",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));

  DAQmxErrChk (DAQmxStartTask (taskHandleRead));
  DAQmxErrChk (DAQmxStartTask (taskHandleWrite));

  While (! fact &! _kbhit())

  {

  DAQmxErrChk (DAQmxReadAnalogF64(taskHandleRead,1,10,DAQmx_Val_GroupByScanNumber,dataRead,1000,&read,));

  DAQmxErrChk (DAQmxWriteAnalogF64(taskHandleWrite,read,0,10.0,DAQmx_Val_GroupByChannel,dataRead,&written,));

  }
  _getch();

  Error:
  If (DAQmxFailed (error))

  {
  DAQmxGetExtendedErrorInfo (errBuffRead, 2048);
  DAQmxGetExtendedErrorInfo (errBuffWrite, 2048);
  }
  If (taskHandleRead! = 0)

  {

  DAQmxStopTask (taskHandleRead);
  DAQmxClearTask (taskHandleRead);
  }
  If (taskHandleWrite! = 0)

  {

  DAQmxStopTask (taskHandleWrite);
  DAQmxClearTask (taskHandleWrite);
  }
  If {(DAQmxFailed (error))
  printf ("error DAQmx: %s\n",errBuffRead); ")
  printf ("error DAQmx: %s\n",errBuffWrite); ")
  }
  printf ("end of the program, press the Enter key to quit\n");
  GetChar ();
  return 0;
  }

• Problem for my compact DAQ recognize the parallel port

  Hello

  I have a NI9133 compact DAQ, which I would like to connect the modules OR.

  My problem is that it is not recognized OR max. I guess I'm missing some drivers; I have reinstalled twice DAQmx 15.0 completely, but I still have the same question.
  Turning to the images attached, it seems that the parallel is not recognized.

  I tried many different things to fix it but to no avail. If anyone can help me

  

  Kind regards

  
  

• How can I control 4 sets of compact system of RIO with my host PC?

  Hi all

  As the title.

  I want to control 4 sets of compact system of RIO at the same time.

  I wrote before for two PC TCPIP connection.

  But I never program to connect to multiple PCs.

  If I need to connect several PC, can I configure different PC connection port?

  Could you give me an example?

  I thank very you much.

  Hi StephenCh...,

  You can calculate the transfer rate that depends on your network card. You will find very good examples on it in the finder of the example, search for tcp/ip. You can use the code on each of your cRIOs server. Use the client to connect to your servers (cRIO), you have to change the IP address. If you need to connect to all at the same time, you need to change the client program a little, so that you are able to build four connections.

  Where do you have problems? Have you ever seen the examples?

  Mike

• acquisition of wireless signals and record the signal as text at the same time for 5 minutes

  Hello

  I'm wireless ECG signal and the display in waveform graph. And at the same time, I need to save it as text for 5 minutes. The problem I faced is for record of the signal, I use scripture to the extent file that saves the file as text... but everything by saving the trace speed decreases.

  I'm very new to labview so please can someone me if Miss me something in it... Please help...

  Why people always post photos of their screws rather than the screws themselves or at least excerpts?  We can't tell from the picture what Version of LabVIEW, you use (so if we post code, you will not be able to open it), and we can not 'play' with your code and try without, ourselves, by hand, trying to recreate your diagram (sometimes very small).  Please, help us help you!

  This is in any case helps to familiarize yourself with the design of producer/consumer model.

  1. Open LabVIEW.
  2. Click on 'File', choose 'new '.... "(no new VI), then (in models) producer/consumer Design Pattern (data).
  3. Study the model and adapt it to your problem.

  The producer would be anything that generates data.  Once you have the data, you put on the queue and send to the consumer for the entire treatment.  The idea is that the producer has an inherent calendar that he must answer, otherwise you lose data points.  The consumer, on the other hand, just need to follow 'more or less' (in fact, the queue may / will develop, if the amount of data is not megabytes, so the consumer can really be quite slow, if you usually want to consumers, on average, to be at least as fast as the producer).

  Bob Schor

• How to enter a wireless signal and convert Ethernet cable?

  I'm totally bafled by the nomenclature of wireless gadgets and would appreciate help. I already have a wireless router that allows my laptop work anywhere in my house. My need is to recover the wireless signal and somehow get this signal into an Ethernet cable.

  The reason is that my DVR (Replay TV) connects to Internet via Ethernet (not USB) cable and I want to move to a place where it would be impractical to try the new wiring through the walls.

  Thank you!

  You need a "wireless ethernet bridge", like the WET54G, WET200 or WET610N.  Once you set up the device, just wire your DVR to it.