PCI-6110 - calculated resolution RMS

Similar Questions

• Would it not correct to say that the PCI-6110 can be set to 'redeclenchables' but the PXI-6115 module cannot use this property?

  Would it not correct to say that the PCI-6110 can be set to 'redeclenchables' but the PXI-6115 module cannot use this property?  If Yes, where is it documented the series cards can do trigger?  For example, is it possible to configure the trigger on the PXI-6124?

  Hi Joel_Neptune,

  The PCI-6110 and other materials as the PXI-6115 S series and SMU-6124 do not natively support NOR-DAQmx analog input alarm. However, you can use one of the generalist counters/timers of the Council to generate a reenclenchees pulse train, then use this as the sample clock pulse train. This transportation example shows how:

  LabVIEW\examples\DAQmx\Synchronization\Multi-Function.llb\Multi-Function-Ctr Retrigg Pulse Train generation for the Clock.vi sample

  In addition, the new material of the simultaneous sampling X series are supported trigger analog input without using a separate task of counters/timers.

  Brad

• How to calibrate the PCI-6110 with NOR-DAQmx

  Hello

  I am a new user of the PCI-6110 Council tries to run the calibration using LabVIEW procedure. I look at the document "Calibration" on the page of the manuals for the Board of Directors,

  http://sine.NI.com/NIPs/nisearchservlet?nistype=psrelcon&NID=11888&lang=us&q=FQL: 28locale % 3Aen % 29 + AND + % 28phwebnt % 3 A 1081 + OR + phwebnt % 3 A 7075% 29 + AND + 28nicontenttype % 3Aproductmanual % 29 + AND + % 28docstatus % 3Acurrent % 29% 20RANK % 20nilangs: en & title = NOR + PCI-6110 + manual

  One of the first steps in the document is to call the AI_Configure command to set the input mode, beach, etc. I'm using LabVIEW 8.5 with the NOR-DAQmx software, and I can not find the command (which, in LabVIEW, seems to be "AI Config.vi") anywhere. The calibration paper was written in 2003, and I gather from Google searches (please, correct me if wrong) that this command is actually a part of NOR-DAQ traditional, who was replaced by driver OR DAQmx.

  My question is this: what is the equivalent to AI_Configure command in the latest software? Is it perhaps a subsequent document describing how to calibrate using NOR-DAQmx?

  Thanks much for any help.

  Tom McLaughlin

  Hi Tom,

  The calibration Procedure series B, E, M, S, which is also linked from this page, describes how to calibrate the PCI-6110 with NOR-DAQmx.

  Brad

• PCI-6111 is recognized as PCI-6110

  I have a Board OR marked as PCI-6111, but when I inserted in a PC, it has been recognized as PCI-6110. Subsequently, none of the inputs or outputs work. The analog inputs still show a flat 10V line, while the exit is blocked to 500 mV. The card go through self-control, however fails self-calibration. Reset of the card does not resolve the problem.

  Based on the images below, what a card 6110 6111? Could he just scored, in which case the card is probably damaged?

  It looks a little dfferent PCI-6111 cards available to us, but perhaps that is a previous model (it had been built, it seems, in 2000).

  Or might pose the problem with inputs and outputs that the PC does not correctly recognize it? If this is the case, is there an easy solution (in relative terms) of the problem, sending to OR for repairs?

  Thank you for reading.

  

  

  

  Filipp,

  Where did you got this card?  It is a very strange problem.  184111 K-01 part number is for a 6110.  The part number 184111 G-02 is for a 6111.  The jury is without a doubt a 6110 as you can see the 2 of the 6111 4 chips on the left hand side related to the 4 channels of the 6110 vs.  So I recommend you all what's wrong with that you send it back in OR for repair.  You can give me a call at 1-866-275-6964 SEO SR #: 1436085 and I can help you through the process of RMA from here.

• Minimum width of the PCI 6110 AI signal

  Hello

  I have a fundamental question on channel PCI 6110 AI.  What is the sample and hold time of the ADC used inside the map? Or how much time I have to keep my constant input signal for the true conversion of data.

  Thank you very much in advance for your help.

  TOROs

  Hi TOROs,

  You can find details on the ADC of 6110 here.

  I hope this helps!

  Bye,.

  Licia

• Weighted Bandlimited a calculation of rms noise

  Hi all

  I want to calculate the band including a weighted rms noise.   I'm able to calculate noise from rms to an analog signal without any bandwidth limitation.  Find the attached vi for details.  I want to limit the bandwidth to some known values (say 20 Hz to 20 kHz) and then calculate the rms noise.

  Please advice.

  Thank you best regards &,.

  Siva

  Siva,

  What is the problem you are having?

  I do not have the Sound and Vibration Toolkit, but when I replace it with a filter from the palette of Signal Processing, I get changes in bandwidth and in the calculation of rms.  The RMS.vi of the mathematics > probability & statistics palette produces the same value you use the VI of statistics. Based on average DC - RMS.vi Signal Processing > range of measures of waveform produced smaller values on the 3 orders of magnitude.

  Lynn

• PCI-6110 to change analog input range

  The analog signal I want to measure is 24 volts and the maximum PCI 6110 is Volt.However 42, analog inputs that appear in the device under device NOR-DAQ traditional (old) configuration is 10 volts (single selection). I'm using LabView 7.1, DAQmx 8.6 and there is no function for allowed me to modify and change the analog device input range (Please find the print screen of the attachment). Can I know how can I change the analog inputs range?

  I think that's what you're looking for:

  S how to set up a data acquisition card series for the entry level so it does not Clip?

  You must set up an appropriate gain so that the other ranges of voltage is displayed.

  In addition, you can post on the forum instead of Labview data acquisition in the future, because the chances are that you will get better/faster responses there

  Good luck!

• Re: Calculation of RMS

  Sorry for the use of this thread I can't find a way to post new problem.

  How amplitude and level VI calculates RMS calue for multi-frequency signals. For your unique, Vrms = Vpeak/sqrt (2) gives same result but for multi-frequency signals, is not match with 'amplitude and level measurement VI' calculated RMS. I need formula to calculate the effective value for calculations PAPR multi-frequency signal. I need RMS formula for multitone to apply the PAPR calculation in hardware.

  Attached code shows calculation of the PAPR by using different values of the RMS. Only calculation RMS Labview gives good results as comapare to "Vrms = Vpeak/sqrt (2).

  RMS = SQRT (SUM(X^2) (X) /sizeof)

  If only it turns out that for a full cycle of a sine wave, the RMS turns into Vpeak/sqrt (2).  For anything else, you must go through the full definition of the RMS to compute.

• Calculation of RMS

  Hi all

  Please find the attached VI, I am computing the RMS for the first 20 values of amplitude. I want to reiterate this RMS calculation for every 20 samples until the end of the data samples. Suppose I have 1000 data samples, I should be able to draw on the graph of 50 points of RMS. Advice on how to go about it. Excuse me if I missed anything.

  Thanks in advance,

  Hey Kevin,

  Try this:

  

• Calculation of RMS through a rectangular window with gap of time 25%

  Any signal (for example the sinuses), I need to calculate the RMS value, with an integration time of 1 millisecond , through a rectangular window, with a gap of 25%.
  In other words, instead of calculate an RMS value by considering every 1 ms interval, I need to calculate the value of a 1 ms window, then apply a gap of time 25% (of the window) and calculate the next RMS value assuming a 1 ms interval and so on.

  For example, in a 1 ms window, there is a 75% overlay.

  I appreciate all help.

  Thank you in advance.

  Hello.

  It has been long since I last posted something.

  I managed to get what I wanted, now I need to optimize it.

  I simulate a sinusoidal signal and I get a 1 MS integration time 't' just setting the number of samples n and the "fs" sampling rate (fs = N / t <=>t = N / fs). Can I use the tool "Extract the Signal Portion" and I calculate the effective value of the part in a loop.
  Anyone know if there is a way to do the same thing without the 'extracted signal part', because this tool using too much memory if the duration of the treatment is just too long with 4 k samples and 4 M samples/second.

  Thank you.

• PCI-6110 continuous data

  I am trying to take data continuously from 4 channels maximum 5Msamples per second and writes at the same time as the data on the drive using the TDMS writer.   I use daqmx LabVIEW tools to read and write data.  I get failry good flow, but it is not completely continuous.

  1 is it possible in Labview?

  2. is it possible with NIScope?  NIScope is at all related to labview?

  Thank you

  Ben.

  I'm not an expert DAQmx, but it is a fairly common use case covered by the API. You can configure DAQmx so that when the data are collected, it is written as efficiently on the disk. You can do it for a continuous data stream. You can find an example of this here (and more examples using the LabVIEW example Locator: Help-> find examples...):

  \examples\DAQmx\Analog Input\Voltage - Input.vi continues

  This VI uses the data at the level, so you will want to choose not adjusted I16 data for the type of output to the maximum speed.

  Alternatively, you can use a producer/consumer architecture, acquire data in a loop and it continuously to the PDM in another. It is essentially this as the example above, but much easier and more quickly, because it involves fewer copies of data.

  Good luck!

• How for-loop to calculate RMS with length of 100 samples window and step 1 sample window

  Hello world

  I'm trying to make a transition from Matlab to Labview signal processing needs... Specifically, I need to smooth out and quantify a randon, two-phase sampling signal ~ 128000 in length... In matlab, I so calculate the RMS with a length of 100 samples window and no window of 1 sample to smooth.linear evelope signal; do my calculations of amplitude...

  I have a problem to do in Labview... The matlab code that I would use normally is:

  ___________________________________________________________

  Variables to assign % RMS

  x = signal of interest;

  window_length = 100;

  window_step = 1;

  Calculation of % RMS

  EMG = x ^ 2.

  index = 0;

  nWindows = floor (nrows - (window_length - window_step)) / window_step;

  EMG_rms = zeros (nwindows, matches); % The pre-allocating memory

  j = 1:window_step:length (EMG) - window_length + 1;

  index = index + 1;

  EMG_rms (index, = sqrt (average (EMG (j: j + window_length-1,));))

  end

  ________________________________________________________

  I tried many times with the loop for, but no luck... Ingore smileys... They must be a colon (:, to indicate all lines) followed by a)...

  Any suggestions?

  Thank you

  
  

• WIDTH of RMS in milliseconds

  Hello

  I have a question which I can not resolved. I used the function calls ChnRMS (XW, Y, E, RMSWidth) and users if they wish, can change the RMS width in percentage. But now they want to specify the width in milliseconds and I need a script for milliseconds in percentage change. What can I do?

  Thank you.

  Sara

  Hi Sara,.

  You can convert the time window in seconds to the window required in % with the following equation:

  L1 = NOC ("Time_Front")
  % = (CMax (L1) - CMin (L1)) * SampleRate_/100

  It would also be possible to create a custom dialog box that does this automatically and have your username jump to the top of this dialog box instead of the RMS ANALYSIS dialog box, but there is no way to customize the appearance or behavior of a function of ANALYSIS expedition.  We could take hostage the ANALYSIS icon for the calculation of RMS and have this call to the top of your custom dialog box, though.

  Brad Turpin

  Tiara Product Support Engineer
  National Instruments

• Calculation of signal to noise ratio

  Hello.

  I was wondering if it was possible to calculate the SNR of a signal with LabView? I use a DAQ hardware and an accelometer to measure a force.

  Is that being said, possible to calculate SNR by looking at the graph of spectrum or vague? When there is no g on the accelerometer, there is a signal with a little noise... and I can see that in the spectrum of frequecny all the way to the cut-off frequency. What is the background noise?

  I'd appreciate any help!

  Thank you!!

  Abraham_E,

  Thanks for the data.  Curiously, the data do not seem to care what language you were using when you got it.

  The first data column appears as timing information.  The dt in who is 0.0005, which corresponds to a frequency of 2 kHz.  You said 400 Hz in one of your messages.  The discussion at the point 2 below corresponds to a frequency of 2 kHz sampling.

  1. you are right that SINAD is not very useful. SINAD assumes that all the power of the signal is the dominant frequency component that is not quite true for ECG.

  2. the size of the FFT of the signal shows the dominant signals at 50 and 100 Hz which is likely to be able to line with frequency. Al here also erase lines 200 and 250 Hz. You certainly do not want to calculate SNR under the assumption that the desired signal is 50 Hz.  The SINAD VI calculates the fundamental frequency than 49,97 Hz.

  3. If you don't know the 50 Hz and harmonic components, there is no obvious lines in the spectrum remaining. I interpret this means you have the significant variation of heart rate data.  This means that the heart rate is modulated in frequency. Frequency modulation broadens the spectrum.

  4. because there is not predominant in the spectrum, it is unlikely that frequency domain techniques will be worth any in the determination of the SNR.

  So, what can you do? Looking at the data graphic, I think a peak signal to noise power ratio could be significant. There are little noise, even at spikes, if it has a few problems too.  I have divided the data set in 1 second segments. For heart rate in these data, each segment contains one or two beats.  In each segment, I found the maximum and minimum values.  I set the value from Ridge to Ridge for the segment of the difference. I also calculated the RMS value for the entire segment. Then the SNR is the signal from Ridge to Ridge divided by the RMS value. It is probably more accurate to use the RMS value of the QRS and exclude parts QRS of the RMS of noise, but to do both is algorithmically and by the much more difficult calculation. It would be also better force segments contain exactly one beat of each. Again, it is much more complicated.  I then calculated the average of the SNR segment values and call it mean SNR.

  As I pointed out, there are some problems with the definition (peak to peak/RMS).  If you just want to compare signals within your lab to see which improves things, this should be good.  If you want to publish data and compare to other published results, you have to find how they define and measure SNR.

  In the attached VI I read the file once and recorded values in an array as a default value. Then I removed the file played screws and just worked with the data. To try this with other data simply insert read VI file in the appropriate place.

  Lynn

• Multiple PCI-61XX cards can be connected to sample at the same time? If so, how?

  Our plans include a variety of experiences that involve the acquisition and use of cards PCI-6110, 6111-PCI and PCI-6115 for the acquisition of analog signals.  Is is possible to combine two or more of these cards so that they sampled simultaneously and thus increase our number of simultaneously sampled analog input channels?  If so, what are the physical connections, and how the software is configured to control simultaneous sampling?  Thank you.

  The DAQmx driver that makes it really easy for series S, DSA boards and X series (but mutually exclusive, you can't mix and match the 3 ranges).  You need all the cards in a PXI chassis or, as in your case, a RTSI cable connected to all the advice and the cable set in MAX.  To configure the cable in MAX, right-click on "Devices and Interfaces", select «Create a new...» "and choose"RTSI Cable.  For each device in the RTSI cable is connected to, right-click in MAX, choose 'Properties' and set the cable in the tab 'Configuration RTSI.

  Once it's all installation its as simple as adding all the channels to a single task.  For example, your physical channel channel could be ' Dev1 / ai0:3, Dev2 / ai0:1, Dev3 / ai0:3 "for a 6110, 6111 and 6115.»