Random EM noise filtering of a big motor 3 phases?

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  I hope I still have it in the right forum...
  
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  Is this a bug or maybe something be causing it? Let me know if I need to provide any other information. I am using Captivate 2 and have tested on IE and Firefox browsers.

  Looks like we are on the right track?

  Please, try the following:

  Open the file of one of the on-board demos cp and make sure the sound of the mouse is not active for this one. To be sure that double, using your previous method of the switch and bait for the sound and select new white noise. The fastest way is to go to the table of Storyboard view, select all the slides, click with the right button on one of these, select mouse, see mouse. Right-click again, select mouse, properties for the mouse sound - select the empty sound.
  : )

• My iphone 6 do each time random static noise in the speakers or earpod

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• Random signal noise appears on Satellite C650

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  This beep does appear in Windows, or when it happens?

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• Problems with encoder motor switching noise readings

  Hi all

  I wanted to ask advice with a hardware problem which seems to be pretty common.

  Here I describe my request:

  We are controlling an electric actuator for robotics application. We use encoders to take position readings, and we need to perform analog acquisition for other measures (for example, the force measured using strain gauges).

  The problem is:

  In summary, I have problems to properly acquire position readings of a linear encoders quadrature and also a few analog inputs. The cause is the switching noise generated by the drive motor that we use (which is an engine without Stricker of CC Moog BN-23-23).

  Our acquisition platform is an NI PXI-8106 with a PXI-1042 q chassis. We have two possibilities to acquire the signals. We have a multifunction DAQ series NI PXI-6259 M and a FlexRIO NI PXI-7951R with one module DIO NI PXI-6581R.

  The switching noise have a frequency of 30 kHz. In a scope, we see a series of peaks of noise which are present only during a short period of time (approximately 1/10th of the duration of the noise). The rest of the time the noise is not present.

  The Accelnet amplification module that powers the electric motor gives us a clock signal synchronized with the noise (whose frequency is approximately 1/4 frequency noise). This clock signal provides a way to solve the problem of analog acquisition. We can use this clock to make an acquisition stamped with an external clock in LabView connecting the clock on a spit of PFI or FPGA card. But the noise is also corrupt this clock signal (we get an error daqmx us warning of possible defects in the clock signal and also to stop the acquisition). I believe that to solve the problem of encoder we can also solve the problem of the analog acquisition.

  In the encoder readings noise makes our County to counter upward or backward gradually fast enough. We can get an increase in the position of about 10 cm per second with no appreciable movement in the linear actuator.

  It would be a great help if someone could put the solution he uses to solve this problem.

  Thanks in advance for your help,

  jespestana

  PS: I stress my conviction that we have a hardware problem, because we have only bad readings when the electric motor does not work. I am therefore convinced because we have already done reading encoder and analog with the help of other players, such as hydraulic cylinders. So, I think that it is not a problem with our software (of our LabView VI).

  Hi jespestana,

  I don't know why the noise could be the cause of your encoder can increase more slowly...  However I have a suggestion on the map of the M series (6259):

  M-series cards have a digital filter integrated on the lines of the PFI (see the user manual of M series).  Looks like the noise is a series of 3 ~ US of impulses (1/10 to 1/30 kHz).  Of the available filtering frequencies that you can set on your M series is 6,425 US, which must ignore the impulses (high or low) that are less than 6,425 US. You can configure the digital filtering with a property node DAQmx:

  

  One caveat is that the driver only allows you to configure the digital filtering for entries counter on M Series devices.  For example, you can use a digital filtering directly on your task of encoder, but not for your sample clock HAVE.  A workaround can be found here, which is to set up a dummy counter job to define the PFI filter for your task to HAVE.  If you use the same PFI line for your encoder and the task to HAVE it, you should be able to just set up the PFI filter through the task of the encoder and worry for the workaround.

  Regarding the RIO Flex, I think that you could implement something similar on the FPGA, but I'm probably not the best person to comment on this subject.  It would be probably a lot more work to use the DAQmx API's built-in filtering.

  Best regards

• Filtering of noise - OR 9361

  Hello everyone,

  I use a NI 9361 module to measure the speed of rotation of a shaft that rotates through an electric motor.

  I am faced with loud noises because of this electric motor; When I run it, my meter directly measure frequencies up to 1 MHz, even when my tree is not running. I can't see the same phenomena when I'm looking at the edge of counting results...

  I tried to use the pulse width filter inside my Labview application to filter the signal but I couldn't find anything sufficient.

  Anyone who has ever faced with this kind of question, and if so, is there a solution to cope?

  I thank of altogether.

  You use a shielded sensor connection?  You can also try to raise the level of signal on the 9361 threshold if you CSR.

• How can I remove the noise of a signal?

  Hello world

  I need to extract the phase of a signal of 1.5 Hz which has little noise (see attachment files) and MAX I was recording the signal to 500 Hz. I use the filter of Labview tool value 'smoothing' with a factor equal to 3. Could someone tell me if using the right tool for what I want to do? If so, is-3 a correct number of retativaly? Looking at the result of the signal is much better.

  Thank you

  User

  here still to play

  I did not use the ordinary filter, but also more you know about the original signal, the better your filter or fitting can be.

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  the median filter is good against the spikes, the filter of SG will make an adjustment of polynomial (original designed for adjustment of Spectra but it's also nice noise with propper settings)

  

  Uups, the pic was taken without median filter...

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• Cut noise of waveform

  Hi all

  I read some TDMS files I created during data acquisition. The thing is that when there is no input, I pick up a low amplitude noise (low compared to what I am probing) which of course was recorded in my files.

  I want to set a threshold of amplitude of the signal cut. So when the amplitude is less than this limit, the waveform will be all zeros and when she is at or above that threshold I will deal with my original wave normally.

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  Could someone suggest an effective way to achieve this? If not with the decision-making process but the noise filters? My analysis VI already performs many calculations, so I would do something very simple and intuitive without compromising the resources of the processor.

  Thank you very much

  Panos

  So that we can reproduce and fix the crash, it'll be great if you could post an example VI as well as some example data.

  With respect to the threshold, it seems that you might be looking for something like this:

  

  Herbert

• Why my PhotoSmart 7520 'wakes up' at random?

  Two weeks ago, I acquired a printer Photosmart HP 7520.  He woke up at random times of the day.  This would make its startup chime, the HP logo appears on the screen and the heads would do a little check to 10-15 years.  I have disabled everything I can think of that could trigger this (Webapps, eprint, etc.).  My best guess is that there is a software bug somewhere in the printer that is causing the software to crash, and it is restarted.

  I called HP, and the person suggested that it was abnormal behavior.  So I picked up the printer to the store and exchanged.

  The new 7520, I did exactly the same thing.  Before I return to the store and buy a different product, I thought I would make a last attempt see if there is a way to stop this.

  It is incredibly annoying to have involuntary random when noise electronics.  Especially in the middle of the night.

  Thanks in advance,

  Pat

  Hello world

  I see the UPnP option can cause the problem you are experiencing. Disable this feature in the EWS printers and let me know if you continue to have the problem?

  Disable UPnP in EWS printers:

  Follow the steps below to access the Web integrated printer server.

  1 type the printers assigned to IP address in the Internet Explorer address bar.

  2. Network tab

  3 network option on the left

  4. UPnP option on the left

  5 Select the option 'Disable UPnP'

  6. click on 'apply '.

• How to change the order of the column OR the addition of a space ' ' in front of a filtering value

  I'm using Oracle Dashboard OBIEE 11. I have a bar chart that contains three columns 'less than 1 day', '1 to 2 days' and 'more than 2 days. It is produced by the following code.

  CASE WHEN TIMESTAMPDIFF (SQL_TSI_DAY, "breakdown of DSR" "." ") Was held Date', 'DSR failure". ("" Resolved to Date ") < 1 THEN 'less than 1 day' WHEN TIMESTAMPDIFF (SQL_TSI_DAY,"Failure of DSR". "Occurred Date", "breakdown of DSR" "." " Resolved Date") > = 1 AND TIMESTAMPDIFF (SQL_TSI_DAY," breakdown of DSR"". "") Was held Date', 'DSR failure". ("" Resolved to Date ") < = 2 THEN 1 to 2 days WHEN TIMESTAMPDIFF (SQL_TSI_DAY," breakdown of DSR"". "") Was held Date', 'DSR failure". ("" Resolved to Date ") > 2 THEN 'more than 2 days' END

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  Okay, so the two solutions I can think is:

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  OR

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  ~ Kevin Sun

  Hey Kevin,

  In this kind of situation, I usually take the option of 2 columns: same BOX WHEN once put in numerical values (in your case can be 1, 2, 3 or something like that), and once put in labels (without spaces or any other thing in front, just real label).

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• Help wanted with cell to daq wiring and grounding

  Hello

  I am acquiring data to a load cell using a NOR-USB-6211 OEM Board.  Under certain conditions, I see big spikes in the data that I think are caused by noise.  The DAQ card also produces an analog signal 0 - 10V for a controller of AC actuator to control its output. The current configuration is:

  Analog input: load cell Novatech wired to a Novatech "LMS" (strain gauge amplifier).  Output 0 - 10V of this amplifier is connected to terminals GND AI on the map and HAVE 0.  I use CSR configuration.

  Link to CMS Manual [url]http://www.novatechloadcells.co.uk/pdf/sgamanual.pdf[url]

  Analog output. Son connected to terminals GND AO and AO 0. Configuration of terminal CSR.

  I have attached a diagram of installation

  I understand that the GND AO and AI GND terminals are connected.  My concern is that little noise is created by AC motor controller, and it interferes with the action of the load cell. Can is this possible and if someone suggest a better configuration to avoid this situation if so? I think that at some point, one of my negative wires must be based, but I don't know which.

  Thank you very much.

  John

  OK - Thanks for the quick response. Tomorrow, I will try to acquire the load cell data using Different configuration. Perhaps this will help you reduce the noise.

  see you soon

  John

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• Average timed

  Hello

  I am collected signals every 200 ms for 5 minutes on average. I already know how to install a loop and get an average of iternations N, but that is basically just noise filtering... I want to take all values over 5 minutes and then on average to get an average 5 min my signal.

  What I'm trying to do in the end, it's to get an average 5 min my signal and use a shift register to hold that the average value to use as my 'initial value' or the start-up pressure in my case. I then use this starting as pressure and calculate the increase in pressure per cent over time. After say 30% increase in the average pressure of 5 min I run a sequence of cleaning the filter and repeat the process and get another 5 min way to use my new initial value. Basically, I know how to do all this, but I am just hurt with averaging values... and I tried all sorts of things to the table and looked at examples for hours and still could not understand...

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• Butterworth amplitude

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  Thanks for your replies.

  I was under the impression that white noise with an amplitude of 10 when it is passed through a filter would result in filtered amplitude noise 10.  But now I see why I was wrong.  White noise is the sum of the sine waves of different frequencies;  for example, when you filter on certain frequencies, amplitude (which is a sum) will be lower.

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• Is - what antialiasing does not work for the scxi 1141?

  Hello

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