Loss of information on the edges of the sample of low-pass filter

Similar Questions

• Low-pass filter before the NI 5112

  Hello

  I currently use a 5112 AND measure the signal of an infrared detector in an experience of ring to the bottom of the cavity. Below are three examples of signals. My main question is how I can implement a low pass filter, passive preference, before my 5112 OR undistorted extremely my signal due to the impedance mismatch. Now a few details:

  

  

  

  Some unique captures for each wavelength are shown in color, while average 25 pulses appears offset in black. The range and offset are chosen in each case in order to minimize the noise of "scanning". In the case of 3.14um, the noise that you see is about 25 times noise from scanning. They were taken without the limitation of BW and 100 ms/s mode.

  The detector (Vigo MIPDC-F-10) has a bandwidth of 10 MHz. I think it is a low impedance and is intended to be harnessed with 50Ohms, however its documentation confuses me, and I'm waiting for a definitive answer from the provider. 2.4 part of the manual says 50Ohms recommended, however the Datasheet and our map calibration (below) seem to suggest 1 MOhm is recommended!

  

  There are a few strange oscillations with a period of almost 180ns in our signal that I thought were due to the impedance mismatch existed in the system before I changed it:

  -Detector

  -1 metre 50 Ohm SMC Cable BNC (RG-174)

  -Inline BNC connector

  -meter 5, 75 Ohm BNC to BNC cable

  -Digitizer, DC, no BW limit, 100 ms/s, 1MOhm | 30pF

  When I saw this configuration, I knew something wasn't right and I even he modeled in LTSpice and he showed the same period of oscillations. But now, the Setup is:

  -Detector

  -1 metre 50 Ohm SMC Cable BNC (RG-174)

  -BW digitizer, DC, limit, 100 ms/s, 50 Ohm

  And we still have oscillations, even if the period seems to have changed to 320ns all about. These oscillations, which remain are 99%, probably due to our drop-down ring cavity experiment, however if anyone has recommendations on possible causes or ways I can confirm it is not because of my chain of detection they would be more than welcome!

  Now, the main question. Between the 50 Ohm 1 meter cable and the scanner I would insert a low pass filter. The BW limit has helped reduce the noise, but it can certainly still be further reduced without any lose to our signal. That's because we cut the beginning of the signal and then measure just the the decay time, which is relatively long and smooth (1 to 2 times 1/e US). Thus, in the future I may even want to try to eliminate the oscillations 320ns, but I'm afraid that this much filtering will distort the signal too. Therefore, for the immediate future I'm just looking to 'replace' the filter BW 20 MHz, with something like 1 or 5 MHz.

  Of course, I would disable the BW limit on the digitizer to avoid additional confusion, but nevertheless, I'm not sure how to approach the problem. Usually I do a lot of research and try different solutions. However, I don't have access to all components to this work, so everything should be ordered, and I don't have a lot of time to experiment. Ferrites seem like a possible solution, however not sure how effective they are at this low frequency or the way they work with coaxial cables. I know that the filter passes low RC base, but the 50Ohms (or 1MOhm | 30 pF if I change it) seem to make it impossible. I guess an op-amp based one might work, however the large input impedance is the impedance of coaxial cable... etc...

  All of the recommendations of the technique or red resources wort would be welcome. Thanks for your time.

  A possible way to separate your artifacts electric and the cavity is relatively simple.  You take the data at three wavelengths.  For each of them, make a simple exponential decay (for example exponential Fit.vi) adjustment to your data, then subtract this signal.  You should have something that oscillates on an average.  Compare the residual signals for all three wavelengths, either visually or with something like a power spectrum.  Anything in the three is probably the electronic (and you could possibly model and subtract it rather than trying to eliminate it).  This could break if the rise time of the signals are different, because that will include elements of different frequency.

  I am not convinced that you need to filter your signal before taking data.  As you said, any filter will distort your final signal.  My preference would be to take the raw signal and apply a filtering in the analysis.  LabVIEW has a rich filter, so you can experiment later.  If you apply a filter before the digitization of data, you take you will never receive data.  However, if you know that your data has no component of your proposed cut filter frequency, you should be good.  An analysis of the power on your current spectrum should tell you this.  Be careful.  Your form of rise time may have information you want later.  If you filter, you will probably slow it down.

  Good luck!  Let us know if you need more information.

• Disable fields without loss of information at the time!

  Hello!

  Masters, assistance even of you, I have two fields (items) you want to be not changed by users in a given situation, they already have the same information, if I make a disable them lose this information at the time of the presentation, as I was saying disable tried, but it could be the reason to lose the reference data can not use , an idea that I could use, I put a picture to display fields for easier understanding.

  

  Thank you!

  Rogério Jahnke says:

  Masters, assistance even of you, I have two fields (items) you want to be not changed by users in a given situation, they already have the same information, if I make a disable them lose this information at the time of the presentation, as I was saying disable tried, but it could be the reason to lose the reference data can not use , an idea that I could use, I put a picture to display fields for easier understanding.

  Place items to be readonly instead of people with reduced mobility.

  It is not possible to provide more specific guidance, you did not indicate how you are currently their disabled "in a given situation.

• How to access the information in the report of a pass/fail test?

  I'll call you a LabVIEW VIs of TestStand which are configured as ' pass/fail Tests. The result of the Boolean "PASS/FAIL" of LabVIEW indicator apparently are accessed through the variable RunState.SequenceFailed of TestStand. However, I can't find a similar TestStand variable that contains the information of 'Text of the report' of LabVIEW. Not such a variable exist, nor will it take to create a?

  Hi bmihura,

  The best approach would be to use direct information from the stage itself. You can get the text of the report of the RunState.Step.Result.Report text

  In this way, you go to the step text report directly.

  Alternatively, you can store the text of the report to a variable in the parameters of the step.

  I hope that gets things moving along to you!

  Kind regards

• How to get data not filtered as o/p of the low-pass filter Group

  Hello

  IM new to Labview and exploring it.

  IM implementation of a system in which I need to use a LPF and a series of filter pass band.

  The filtered o/p of the LPF is as I / p for 1 GMP...

  Later, the o/p UNFILTERED 1st BPF is as I / p for 2nd GMP.

  The problem im facing is: I do not see any box in treatment that gives the data filtered or unfiltered together in the time domain of the signal.

  Could you please help me with this asap... desperately need your help.

  Thank you

  PSADAP

  There is not direct the tool to do this, but there is a solution to your needs.

  Say that if you use a LPF (with cutoff frequency, say 50 Hz), now to get blocked (UNFILTERED in your terminology) signal, set a HPF (with cutoff frequency of 50 Hz).

  See the block diagram

  

• How to set the low-pass analog input (smoothing) on my DAQ configuration filter?

  I read the following of the PXI-6251 manaual:

  "On some devices, the cut-off is fixed. On other devices, this filter is programmable and can be switched to a lower frequency. For example, the hardware OR of the 628 x have a programmable filter with a cutoff frequency of 40 kHz that can be activated. »

  It does not explain how you know this value. So, I have the following questions:

  1. How will I know what the cutoff freq is on my device?

  2. How do I know if its programmable?

  3. how this program if it is programmable?

  I use the PXI-6251 in conjunction with the PXI-1031.

  Thank you very much.

  The PXI-6251 has no anti-aliasing/programmable filter. Bandwidth (-3 dB) small signal from the 6251 is 1.7 MHz.You will find these information in the specifications manual.

  If you need a filter, you must add the signal conditioning yourself.

  The 628 x M high precision tips are the only cards of the series M 'programmable' low pass filter. Check this KB for more details.

  I hope this helps.

  Luca

• Filter low pass analog (anti-aliasing filter) external to the NI USB 6251 housing

  Hello everyone!

  -I m trying to acquire an analog signal of tension (high frequency content) using a connected to an edge NI USB-6251 BNC-2110. I learned in this Labview Forum that NI USB-6251 has no analog low-pass filter programmable (or anti-aliasing filter), so that I can't help but jitter when scanning my signals. For my application, the cutoff frequency of the analog low-pass filter must be equal to 100 kHz or MORE (maximum of 500 kHz). A possible solution to solve my problem, would be to work with an external analog low-pass filter before you scan the voltage signal. Based on this I'd like to know:

  (1) national Instruments develops analog external filters? I need a filter which also has one output, analog, so that I could send also the low-pass analog filter filtered signal to my NI USB-6251 box to scan correctly it!

  (2) what model of external low pass filter would be compatible with the NI USB-6251 housing?

  Any help would be much appreciated!

  Best regards!

  Hello

  all high resolution of the M series (628 x) cards are equipped with a filter low pass which can be enabled or disabled programmatically. For the anti-aliasing filter feature, examine the boards of National Instruments DSA (dynamic signals Acquisition) acoustic and vibration measurement
  currently the NOR 9221, 9225, 9227, 9229, 9233, 9234, 9235, 9236, 9239 and 9237 C Series modules feature anti-aliasing filters. These modules are intended for the high accuracy measures for which anti-aliasing filters are a necessity.

  Houssam Kassri

  OR Germany

• Close programs to prevent the loss of information. Your computer is low on memory. You save files and close programs. Java (TM) Platform SE binary Windows Media Player

  Hello

  I keep getting the following error message, and leterally having my computer off over and over again, even if I added 1 GB of RAM (now 3 total RAM) mor and also added a 8 GB SD card as more power:

  Close programs to prevent the loss of information.  Your computer is low on memory.  You save files and close programs.  Java (TM) Platform SE binary Windows Media Player

  I did research on the various search engines to know that many face the same problem, with a variety of possible solutions, but so far, none work.  We suggest that I go to Regedit and change the permissions of the user and then delete the old files, after I import them.

  Needless to say, I am just a user and have just a bit of technical knowledge.  The local PC repair shop in my town has no idea what to do.  For anyone who has a solution to this problem, help will be greatly appreciated!

  Randy Kline

  First of all, unless you know EXACTLY what you do and WHY you do it. I personally recommend never do anything in regedit. I consider myself a moderate to advanced computer user and a moderate user of windows. And I always stay away from regedit, if I can, because you can seriously screw things if you don't know what you're doing... Although, to be honest most of the settings will not have a devastating drama.

  It seems to me that this is a memory leak in the program, you will get this error message to make sure that your computer will just crash, because if she is running out of RAM... Well it will crash.

  If you have a 2 and a 1 GB for a total of 3 GB, I recommend the upgrade once more and just round up to a nice 4 (this is the most of memory a 32-bit system can handle in total)

  Works of memory in a way that you see really only a few performance jump with memory dual channel, the only way to have that is really striking the rods of same in each slot.

  There isn't really a reason that this happens every time, except that simply your computer is low on MEMORY, when your computer says this means RAM, not disk memory storage area.

  If you clean your computer of the programs you never use and stop using windows media player (itunes is better in my opinion, even if you don't have an ipod), you can see an improvement, but to really isolate the problem, I recommend simply opening your task manager as soon as you start your computer (ctrl + alt + delete usually gives you the option or it opens directly) otherwise you can do start-> RUN taskmgr.exe , OR type taskmgr.exe in the search box and press on enter.

  Then, look at the column of memory as I said it sounds like a program has a leak, and you will see that is because memory will begin at low/normal and then numbers just keep climbing...

  Also, make sure that your computer recognizes all 3 GB or RAM. in Task Manager if you have access to the performance tab, under physical memory must be a thing called Total, 3 GB = 3074. If this is not an option in your reason, you can go under Accessories/System Tools system information (on the start menu). (may take a while to load) but on the home page, you should see something that indicates the amount of TOTAL PHYSICAL MEMORY. You want to read this / 3GB or 3074 MB.

  Hope this helps some!

  I recommend to remove all programs, you are ready to, especially those that you never use. Do a complete uninstall. Then start installing windows clean (download google) just to make sure that the program has been removed. then go start--> run msconfig OR just type msconfig in the search and click on go (I don't know if you're running XP or Vista/7)

  In the msconfig dialog, you should see a section that says startup. Don't forget to remove programs that you do not first. Disable startup programs, you use every DAY. Don't go turn off all if windows needs some process to run, and some processes don't effect anything. But if you're curious, you should be able to google all of startup items and see what it's related to and why you do or that you don't need.

  Good luck! Sorry, I'm everywhere with this response.

• Close the program to prevent the loss of information

  I use a computer with the configuration of intel (R) core (TM) i7-3770 cpu @ 3.40 GHz, 3.40 GHz, 8 GB of RAM with the 64-bit, (processor 64-bit cross) operating system and I use Matlab 64 bit R2011b. After 4 hours, the error came... Close the program to prevent the loss of information. Your computer is running memory, save your files and close these Matlab (R2011b) program. The result of the command is windows will close only enough programs to restore needed memory. So please give some suggestions to solve the problem.

  Hello Julie,

  You can refer to the suggestions mentioned by martelmungo on March 11, 2014.

  Close the programs little memory to avoid the loss of information

  http://answers.Microsoft.com/en-us/Windows/Forum/Windows_7-performance/low-memory-close-programs-to-prevent-information/e1f3960e-6935-44D7-BA11-12a125553387

  I hope this helps. Otherwise, feel free to write us again and we will be happy to help you.

  Thank you

• Microsoft Silverlight will / can send information about the people and the info on their computer. What are the plans for Firefox to protect its community of users of this?

  After reading the privacy statement from Microsoft regarding their Silverlight 5, it has troubling information about the loss of his privacy, under the "collection and use of information...". "the personal information and the information on my computer! In addition, information may be stored outside of the United States! (paragraph 4 under "collection and use of information... »). As part of the FireFox community, what other options do we have?

  P. S.
  I clicked on "Shared Data" on my Firefox browser, that means all average data? All good or bad I should know about?

  Hello 010matrix010, firefox will not run on the default Web sites, but only silverlight content when a user activates explicitly the plug-in through the icon in the address bar or click on the embedded content.
  also the support for plugins like silverlight in the browser will be dismantled at the end of next year: https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plugins-in-firefox/

• Get information from the low level of the Subvi ni5660

  A quick explanation of the problem: I need to create several VI just to return a value of the PXI-5660 (ex: Center frequency, Span, etc.) while the entries are only a "VISA" and one "error in.»

  Detailed explanation of problem: I need to create multiple VI that the properties 'Set' or 'Get' of the PXI-5660 module (ex: the Central frequency value, get frequency, etc...).  Each VI must have a VISA in/out and in/out Error, but the only other present in/out should be the property of game/called.  Global variables are not allowed.

  One of the biggest problems for me is that ni5660 drivers do not contain a property node.  I managed to (apparently) set some of the properties by feeding only a single entry in the icon 'configure ni5660 for spectrum', but the only tool that seems to be able to output all information is the icon «MT get Attributes»  The release of 'MT get Attributes' does not contain many of the properties that I need good output.

  I tried to use the icon 'MT get Attributes' linked to "ungroup by name" which has the value "handle receiver.handles.niScope" which feeds on the reference to a property niScope node, hoping that I would be able to obtain information through the niScope 5660 (it seems that ni5660 software uses the niScope on a lower level software ", correct me if I'm wrong).  This VI finished, when put online with the 'ni5660 Initialize.vi' and ' ni5660 Close.vi, ' returned the error (-1074135028) with the explanation 'ID attribute not recognized.' ""  (The error occurred on the property node in the Subvi "Get the Central frequency")

  The goal is to make the action of PXI chassis similar to a HP8563E Spectrum Analyzer.  With this in mind, the list of attributes that I will need in the end to set and get (the separate VI) are the following: Center frequency, Span, window, number of Points, resolution bandwidth, level of reference, mitigation and time sweep.

  I apologize for my (very probably) simple question, but endless (I only started programming in LabVIEW there about 2 weeks).  If someone would be able to point me in how to make apparently PXI-5660 current property settings from thin air, I would be very grateful.  If more information or details are needed, feel free to ask.

  Thank you

  zdunn wrote:

  ....

  but unfortunately, I'm still at a loss, how to create a VI that "calls" that same property back and the fate, while using only 'VISA In' and 'In Error' as inputs.

  Located on how silly that statement. You want to create a function where (for example) you want to set the resolution bandwidth and do not want to pass as a parameter the name of the instrument. You have created the programming language that is able to read minds?

  You can use a function where you can pass a parameter in (or use a function that retrieves a parameter) or do nothing at all with the instrument. It is more complicated than that.

  There are tutorials available that can help yu with LabVIEW to learn, but I think that there are certain fundamentals means.

  Edit: Sorry, I may have misunderstood. to query does not require an entry but I don't understand what you want to query. The parameters of the instrument are all under control stripped - a program you or any other writing. Unlike a GPIB instrument, there is no one '?' command to read a rear frame. It is assumed that you know how the instrument has been configured in the first place.

• Is it possible to display the tool information in the Info pane?

  It is a feature of Photoshop and I was wondering if there is an equivalent InDesign. In Photoshop, whenever a tool is selected, the details pane contains information on this subject. For example, if you select crop, the details pane says "draw a rectangular selection or move the selection outline." Hold SHIFT, CTRL, and ALT for more OPTIONS. "If you hold SHIFT with selected cropping, the description becomes"constrain square selection or add to the existing selection. »

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  Thank you

  Silvio

  I don't know - I bought a kit of party of taco for $20.

  However, I think that the guys missed something

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