Input signal of the meter

Similar Questions

• In Labview 8.5, what happens if the input signal exceeds the scope of the signal defined by the DAQ Assistant?

  Hi all

  This should be a pretty simple question, but I can't seem to find the answer online and currently do not have the functionality to test this:

  I'm using LabVIEW 8.5 and have a VI that imports data from sensor through the DAQ Assistant. In the configuration tab, there is a range of signal input. What happens if my sensor exceeds this range? I get a warning? The default value is the maximum (or minimum)? I was interested in writing a code to display an error that I approach the limits of this range, but did not know if I also need to include code to display an error if the scope is exceeded as well.

  Thanks for the help,

  Tristan

  Hello, Tristan,.

  The behavior depends on the selected range and the device you are using.

  If you are using a device with a single input range is valid, we will use this range, even if you set a smaller minimum and maximum in the DAQ Assistant.  So, if your device only supports ±10V and you set the range to ±8V, you will still continue to get valid data after your top sensor 8V until what you approach 10V.  When you reach the limit of the extent of your device, the output will be 'rail', and simply return the maximum value until the signal is less than the maximum value again.

  Note: A device that is nominally ±10V usually has a go-around (such as ±10.2V) which are usually specced in the manual.

  However, if you use a device with several ranges of entry then things become more complex.

  NOR-DAQmx player will choose the smallest range that entirely covers the interval you choose.  For example, suppose that your device supports the following input range: ±0.2V, ±1, ±5V, ±10V and you choose 0V - 3V as the range in the DAQ assistant.  The NOR-DAQmx driver will focus on the input range and the list of the entry lines that your hardware supports and choose the smallest encompassing the entire range that you set.  This would be the ±5V, because this is the only beach that contains up to 3V.  Thus, all between ±5V input signal is returned and none outside this range will be 'rail' to the maximum or minimum value.

  We do this because using small beaches make more efficient use of the resolution of the ADC.  So, we try to use the most effective range based on what you ask without picking up a range that will make you miss data.

  Let me know if I can clarify it more.

• Don't boot to desktop-Boot computer ups always come with "no input signal" for monitor

  Thanks for the research on this issue.  So first of all, he could start after a few attempts in the end goes to the blue screen error at approx. 5 min. I started this path several times that in "safe mode with network" to try the many suggestions of repair for two days. " At this point, it's freezing just at "windows is loading files", but probably will go to blue screen error. Boot ups always come with "no input signal" for the monitor and signal switching in the Help menu for 5 min periods I've mentioned and then fails or "monitor going to sleep" occurs.

  The error messages rec'vd: corrupted image, corrupted file and header file check sum does not match the sum of computer control. The recommendations of the screen blue: disable the BIOS memory, any material current or drivers and check disk space.

  Some tent to fix: memory diagnostics and it showed 'no problem', checked monitor on another computer and it works, in a session of 5 min a download to 'fix' Microsoft via a USB problem like "search of windows crashes" but was 'unable to set', a few other attempts would show the "windows installer has stopped working" preventing any action.

  At the present time, am unable to start even with advanced at F8 options.  It's HP Pavilion 10/2007, with the help of HP. Its on a wireless network with a netbook, Blu - ray, occasionally a cell phone that works on windows live but none presents as a device.

  Hello

  ·        You did changes to the computer before the show?

  ·        What is the exact error message that you receive?

  Method 1: Remove the external devices except the keyboard and mouse and try to restart the computer in safe mode and check if you can start inside.

  If you are able to boot into safe mode then try a restore of the system it and check if it helps solve the problem:

  http://Windows.Microsoft.com/en-us/Windows-Vista/system-restore-frequently-asked-questions

  Method 2: I suggest you do a system recovery options system restore and see if it helps:

  http://Windows.Microsoft.com/en-us/Windows-Vista/what-are-the-system-recovery-options-in-Windows-Vista

  Method 3: If the system restore does not help then do a startup repair and check if this solves the problem.

  http://Windows.Microsoft.com/en-us/Windows-Vista/startup-repair-frequently-asked-questions

• Why do I get signals ghosts with the meter?

  Hi, I am able period using the NI 9401 on a cDAQ9174 chassis.  I have a sensor whose output is 50mV LO and HI 4500mV, and this is easily measured with a scope and a DMM.  Furthermore, the scope shows very clean transition, no noise near the 2, 5V TTL threshold.  The probe monitors pattern reflecting on a spinning wheel.  Measures the time of the order of less than 0.3 seconds, but, curiously, the measurement period seems to be good for a few cycles, and then suddenly these values close to ZERO are observed. (Excel data show these values literally '0'.)  What is c?  Where are these unwanted readings from?

  Also, see the code that I use to record data from the period, and a typical example of the data plotted in Excel.  One thing I'm confused about is the timer in the WHILE loop.  How the meter may return a value that is smaller than the function parameter WAITING in the WHILE loop?  The WAIT function is set to 100ms, but the meter will return to values far less than 50ms.

  Is there a way to remove these values in the software?  For example, can I just throw any value less than 0.050 seconds?  This kind of fix would be perfect for our application; It's a little gross, but she would get me to the next step in our project.

  I really appreciate your comments!  This photointerrupter is supposed to have the advantage of being a camera and free of noise in the environment, up to now, the only noise in our environment is the small DC motor spin our wheel on our lab bench... not a harsh environment at all.

  Dave

  Hi Dave,.

  That's what I think is happening here.  In the configuration of the measurement of a meter task period DAQmx, the source of the signal is connected to the door of the meter and the internal time base is used as a source.  When the input signal is HI at the entrance to the Terminal, a count is saved for each rising edge of the timbase to the source of the Terminal.  When the signal of door to LO County is drawn from the register in the buffer and legumes subsequent source are ignored until the door is HI again.

  Now assume that the signal of your door is swinging very quickly prior to staying at the State HI or LO.  Whenever a HI LO oscillation occurred, a count would be drawn from the register of the meter.  If this rise and fall of the door happened quickly enough, it is quite possible that very few or none of the timebase impulses were actually counted to the source terminal, thus recording a very low double value in a buffer of the computer.  When these sets of values has been extracted from the buffer and written into the worksheet, accuracy of scripture to the worksheet VI may have been set to the default 3 decimal, so write "0" s to the file.

  The speed of the swing may be the order of 10 to 100 ns, fast enough at your fingertips, do not register.  The quote that I copied the help file describes the behavior with the digital filter enabled.  When you apply the digital filter, a county is not from the register unless the signal of the door remains HI for a fixed minimum amount of time.  With the filter, the period 0 counts are not sent to the buffer because the door is not HI for the minimum period of time.

  Brian

• -Data 200141 was replaced before it can be read by the system. Mechanism of data transfer is interrupted, try to use DMA or USB in bulk. Otherwise, divide the input signal before taking the action.

  Hello

  Installation program:

  2 x PCI-6602

  Configuration:

  Sampling the five PWM signals of 50 kHz using five counters (2 on a map) and three on another for about 10-15 seconds by recording continuously.

  All meter tasks are configured for DMA transfer.

  Problem:

  I get 200141 errors from time to time.

  Question:

  I tried to increase the size of buffer and all tasks of meter are set to DMA. In the error message the last suggestion is to "divide the input signal before taking the action. I don't understand this suggestion. What is meant by "split the signal before taking the action?

  I am open to other solutions to the problem.

  /Mola

  Yes, I know that the 2 MB/s sound do not like much, but it's a way of high load very low tolerance to try to get 2 MB/s.  You have 5 DMA controllers to negotiate access to the bus and each transmits only 1 or 2 samples of 32-bit whenever he gets access.

  I've seen published baseline data where the maximum sustained rate was< 1="" million/sec="" (don't="" recall="" if="" it="" was="" mbytes="" or="" msamples). ="" as="" i="" recall,="" finite="" acquisition="" mode="" allowed="" higher="" rates="" for="" shorter="">

  Ah yes, here is a link that leads to the other links.  See the section on "The counter of the FIFO" in the first message.  Do you see a * very * significant difference in the performance of the M series for the series X-series.  Here are data for counters of the E series.  (It is fair to note that the comparative analysis was conducted with a much older PC hardware).  For the 6602 counter chip was designed between E- and M-series series, so you can probably expect performance in-between.

  Also note that the benchmarks seem to have been done with a task of window unique tent of owning all the bandwidth PCI as possible.  Since you would have 5 tasks they negotiate access, you lose definitely even more overhead.  In addition, for fair comparisons, your 50 kHz PWM would act as a measure of 100 kHz since you have 2 semiperiods to DAB per cycle of 50 kHz.

  Now that I've seen benchmarks once again, I am convinced that it is a no-go for you with just the 6602.  The good news is that the series X-series seem able to yet more ridiculously than I remembered.

  -Kevin P

• input analog trigger on the door of the meter to measure the frequency of generation

  Hello

  I want to measure a frequency on the analog input, but it doesn't seem to work.

  I'm trying to work with DAQmx with the use of the ansi c standard.

  The first step, I've done was acquiring information on the analog input. With the use of a simulated device, it shows a sine wave on the entry.

  My next step is to generate a trigger for the meter signal, but this doesn't seem to work.

  I don't see how it is possible to connect the trigger on the entrance to the analog meter.

  For the creation of the analog input and relaxation, I use the following code:

  DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
  DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-3.0,3.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",10000.0,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,1000));

  DAQmxErrChk (DAQmxCfgAnlgEdgeStartTrig (taskHandle, "Dev1/ai0 ', DAQmx_Val_RisingSlope, 0 '"));

  For the creation of the meter, I use the following code:

  DAQmxErrChk (DAQmxCreateCIFreqChan (taskHandle1, "Dev1/ctr1", "", 1 January 2000, DAQmx_Val_Hz, DAQmx_Val_Rising, DAQmx_Val_LowFreq1Ctr, 1, 4, "");)

  I hope someone could give me a hint.

  I also tried the examples that come with DAQmx but well I know this are only examples to counter with the help of the digital inputs.

  Thanks in advance.

  Hello

  You must use the exit event of comparison at the entrance of the meter. Change this property after the configuration string function.

  DAQmxSetChanAttribute (taskHandle1, "", DAQmx_CI_Freq_Term, Dev1/AnalogComparisonEvent);

  Kind regards

  Bottom

• VI to convert input signals NI 9402 in a RPM value, based on the frequency of the pulses

  Hello

  I'm looking for a VI convert an input signal NI 9402 in a RPM value, based on the frequency of the pulses. Is there such a thing that exists in the library of national instruments?

  I run LAbview 2014 integrated control and monitoring on on a cRIO 9802 high performance integrated system with NEITHER 9402, 4 channels, 50 LV, LV TTL Module input/output digital, ultra high speed digital i/o for the cRIO module.

  Any help would be greatly appreciated.

  The easiest way is to use the FPGA to get the time between the edges of your pulse increase (shift registers to maintain the current situation and the time will be necessary).  This will give you the period.  If it's a single pulse per turn, then the number of laps is just 60/T, where T is the time in seconds.

• USB-6211: analog input signal affecting another of the same map AI

  Hello

  I use the DAQ-nor-6211 map and DAQmx features to read a hammer and a signal of the accelerometer and then use other LabView functions to make the FFT of these analog input signals. However, it seems that the analog inputs where the hammer and the accelerometer are connected generate a kind of noise or influence in other entries of this data that is not connected to any other sensor acquisition board.

  I've had different experiences in order to check if the problem is with reading the card: put the accelerometer and hit the dog in another table where the DAQ card table was located (to avoid the vibrations on the map and a possible noise), ai1 entry was logged on the differential mode on the dog and the ai4 of entry is connected to the output (z axis) of the accelerometer. The other 2 ai2 and ai3, entries that can also be read by my LabView program, are open (i. e., any other sensor is connected to the card). When the structure where the accelerometer is located is struck by the hammer, the signal of ai2 ("x axis" seen in the first attached document) has a curve (on the time domain) which initialize almost at the same time that the hammer and the a3 of entry has a weak signal, but with the swing as well as the signal of ai4. The document "hammer ai1 + z_axis connected_ _x_axis disconnected ai2 + y_axis ai3 ai4" images that I captured the chart created in LabView. On these graphs, it is possible to check on the FFT the ai3 signal and ai4 has the same behavior (with different intensities), and enlarged figure of time domain image, we can see that the signal of ai2 increase almost at the same time of the signal of the hammer (ai1). The signal picked up by the sensors are probably creating a sort of noise on open entries ai2 and ai3.

  Another experiment was conducted to check if the signal from a single entry that may affect the signal read from each other near the entrances: the DAQmx task Create channel had a physical channel has changed: ai3 entry has been modified by ai7 (maintain the same connection mode: differential), and the results are visible on the second attached document. In the graphs obtained in this experiment, it seems that the entrance of the hammer (ai1) affects the signal of input ai2 and ai7, which are not connected. And the ai4 signal does not seem to influence the other inputs, because he has a different curve on the graph of the FFT.

  The same experiment was conducted using the CSR connection (change threads and create the DAQmx Channel Configuration), but the results were the same as those found using differential connection.

  Finally, if the output of the accelerometer is connected on the ai2, the signal of the other open entries ai4 and ai7 seem to be affected by the signal of the accelerometer on ai2 (last document attached).

  Could you tell me if the problem I encounter is caused by the DAQ card with this information that I gave to you? And if the answer is Yes, do you know if there is a way to avoid this noise create in one entry on the other hand, it please?

  Thank you

  Maybe Ghosting or crosstalk? Just an idea.

• The NI 9215 input signal voltage

  Hi all

  I tried to test NI 9215 BNC in MAX. And the acquisition of data took place without input signal.

  The voltage for all 4 channels, I read is about 10.4 Volt.

  Is this fair? I thought, the voltage should be 0 without input signal.

  Best regards

  GL

  If you leave the open entry, it will tend to float to one of the rails.  From my experience, it's almost always the top, so the 10.4 volts.

  If you short-circuit the input, you'll get certainly 0 volt.  You will probably get 0 or nearby yew, you put a resistance across the entrance.

• 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;
  }

• Using the DAQ USB-6009 meter and an analog input voltage at the same time.

  Hello

  Currently, I'm reading the two channels of voltage with the USB-6009. It happens that one of the channels is the output of a digital coder, and it would be much easier to use it directly to the PFIO entry that is defined as a counter. The problem I am facing right now, it's that I can't use the DAQ Assistant to use the analog voltage to a channel and the digital channel counter at the same time. Once I put the DAQ Assistant to read the input from analogue voltage, I won't be able to add analog inputs. And as I put the DAQ Assistant to use the PFIO as a counter, I can add more entries to read analog voltage is.

  I wonder if it is possible to solve this problem using the lower level data blocks? Another solution would be to read two channels in analog input voltage and that the use of Matlab to process data resulting from it, since I was not able to do the counting to work simultaneously with the acquisition in Labview to impulses.

  Hope you guys can help out me.

  Thanks in advance.

  Using a simple wizard of DAQ is incorrect. You need one to acquire analog inputs and one for the meter.

• Should I reset the FPGA FFT when changing the input signal?

  Hello

  I have an application based FlexRIO where I do FFT on several incoming signals. The signals will be ranked so that I get first for example 4096 samples of Ch1 and Ch2 4096 samples, etc. This means that I don't have to do it in parallel of the FFT and I would like to reuse the implementation of FFT and windowing to reduce the use of resources.

  I intend using the VI Express followed by the Express VI of FFT window scaling

  http://zone.NI.com/reference/en-XX/help/371599J-01/lvfpga/fpga_scaled_window/

  http://zone.NI.com/reference/en-XX/help/371599J-01/lvfpga/fpga_fft/

  and I'll use them inside a SCTL.

  This figure comes from the section using the FFT and help illustrate the issue:

  

  There is a discount to zero terminal for the fenestration and the FFT VI.

  Are there internal registers in the windowing and FFT which force the image 1, image 2,... from the same signal or is it possible for the first entry in a framework of Ch1, the next frame belonging to Ch2, Ch3 gaze and so on and always get reliable results?

  Another way to ask the same question: if I have to reset the window and FFT when changing the input signal?

  Thank you

  Anders

  Hi Cyphish,

  When using the FFT of the LabVIEW FPGA vi express and windows nationwide express vi calculations are make it point by point so there will be no problem when going through different types of measures. Therefore, you should have no problem with your application.

  Best regards

  Menelaos.K

• How the input signal updated step in simulation?

  Hello

  I have my own model of transfer function. I did first with Matlab/Simulink simulation and succeeded. I use the Signal Generator in Simulink to get out my custom step signal. I modified my step so signal to:
  t = 0 y = 0
  t = 0.1 y = 0
  t = 0.1 y = 50
  t = 10, y = 50
  t = 10 y = 65
  t = 30 y = 65.

  It's the kind of staircase input signals. Now, how to build such this approach custom signals to be fed in my transfer function. I tried the function 'Not of Signal' of the 'Simulation', but I can only get the 50 and I don't know how to add more "staircase" in my input signals. Could someone help me?

  
  

• Using an 53131A, how do I detect the condition of no input signal?

  Hello

  I use an Agilent 53131 A frequency counter to measure the frequency of the oscillator.  I need to be able to use the frequency counter to read the frequency when the oscillator is oscillating and indicate when the oscillator is bad (no signal present on the 53131A of entry).  Does anyone have any suggestions on the type of command I should use?

  FETCH?
  READ?
  MEAS?

  The problem I have is in the trigger.  When the oscillator is bad, the counter hangs up because she continues to wait for a trigger that will never come.

  Thanks for any help

  In fact you have right to the solution yourself.  You need to revise your release scheme or you can use the absence of trigger as your indication.

  For example: you know that the measure will have x seconds to complete if the signal is present.  If you need to determine whether the measure is right here.  Simple if you use GPIB-

  (1) set the property of VISA TMO to be as long as you wait for the measure.

  (2) enable SRQ on operation completes in the meter. (ATTENTION: make sure that no other instrument allows to block Service Requestby the meter setting as low as possible address)

  (3) when you send the boot command, you can query the status of the SRQ with the "wait for SRQ.vi" If no signal is present, then the wait fo SRQ will return with a time-out error.

  (4) clear the error since you know what caused it and send a clear command (* CLR) at the counter to return to the idle state.

  Alternatively, if the signal is present, the meter will trigger SRQ when the measurement is finished and you can then extract the memory reading.

• create 4 pulse digital output at the base of the ttl input signal

  Hello

  I am a beginner in Labview and would welcome advice on how to solve the following problem.

  I'm setting up a train of pulses TTL and would like to send in Labview as input.  Each falling edge detected on the input signal, I would like to as Labview to generate 4 pulse digital output.  For each output pulse, I would like to be able to specify the period and duration.       The image should illustrate more clearly, with the figures showing the expected scale.

  

  System: NI PCI-6733 data acquisition card, Labview 8.5

  My daq card has 2 timers 24-bit and 8 e / s digital, but I don't know what the best approach is to create between the pulse output of 4 to 8 of this precision... should it be handled at the hardware or software level?  And how would I go about it

  Thank you

  -Sidney

  Hi noli.

  I found the problem, in fact PCI-6733 support only avoiding the digital output. The timing of software is limited to 1 kHz in case better.

  I'm sorry, but this function is not possible with a PCI-6733.

  Concerning