noise of biaxial precision accelerometer

Similar Questions

• Noise measurement of an accelerometer with card PCI-4461

  Hello world

  I'm trying to measure the noise of an accelerometer, except with a card PCI-4461.

  First of all, I measured manually this noise with the help of a HP35665 signal Analyzer. I get something like this:

  

  And now with LabView and the PCI-4461 map, I get this:

  

  My question is: Whence this part? And how to remove it? (Since there is no with the signal Analyzer)

  

  I'm using LabView 8.5.

  This is how I configured the DAQ acquisition:

  

  and it's my VI:

  

  Thank you in advance for help

  Arthur

  
  

• Noise hiss/static of the helmet; speakers OK (precision M4800)

  I have a precision M4800, bought mid-March.  A week ago, I wanted to watch a video educational work without disturbing my neighbors, so I tried to plug the headphones into the socket (as opposed using speakers).  Move the bad: the neighbors could hear the static electricity in the front headphones that I tried to play all of the sounds around them.  (Yes, the noise was loud.)

  Usual volume controls that work for the speaker had no effect on this noise in the headphones.

  Now I run FreeBSD (stable/10 and head) on this machine - I have no idea how to do anything intentional in a Microsoft environment.  I keep the original disc supplied with the machine, so I could re - install that, in view of the detailed, explicit instructions on exactly what to do.  (Note: I swapped the drive until I turned on the machine for the first time, so that the player is currently 'intact'.)  Note 2: I field replaced the card wireless network, as Broadcom WLAN cards are pretty useless, at least for FreeBSD.  I still have the original card; I don't know if the Microsoft environment awaits the Broadcom adapter or not; If so, who should probably be part of the instructions.)

  I raised the issue on one of the FreeBSD.org mailing lists; an answering machine mentioned a similar experience. noted that the helmet he used was for a smart phone and keys for a microphone; When he used the controls (FreeBSD) to completely mitigate the mic, its noise ceased.  I tried... without result.  I also tried a regular cheap helmet that had no possible connection microphone; my symptoms persisted.

  Then, I noted that it might be interesting to determine if noise persists even before the start of the OS, so I had headphones plugged during a reboot cycle: they are SILENT as the BONE end and started hissing again just in the middle of this section of the device probes:

  SMP: AP CPU launched #1!
  SMP: AP CPU launched #4!
  SMP: AP CPU launched #6!
  SMP: AP CPU launched #7!
  SMP: AP CPU launched #3!
  SMP: AP CPU launched #5!
  SMP: AP CPU launched #2!
  Time counter 'TSC-low' quality of 1396794172 frequency 1000 Hz
  Mount root waits: usbus2 usbus1 usbus0
  uhub1: 2 ports with 2 removable, self-powered
  uhub2: 2 ports with 2 removable, self-powered
  uhub0: 21 ports with 21 removable, self-powered
  Mount root waits: usbus2 usbus1 usbus0
  ugen0.2: to usbus0
  ugen2.2: to usbus2
  uhub3: on usbus2
  ugen1.2: to usbus1

  The noise persists until the headphones are disconnected or restart the machine.

  I found that the NVIDIA audio devices and RealTek are found by the kernel:

  G1-254(10.1-S) [7] cat/dev/sndstat
  Systems put in place:
  PCM0: (game)
  pcm1: (game)
  mcp2: by default (play/REC/WAV)
  pcm3: (play/REC/WAV)
  G1-254(10.1-S)

  I opened the machine up a little bit to see if there is something obviously wrong (for example, a wire loose), but I was not able to access this part of the material without indulging in a more invasive surgery than I care to do to a machine that is still under warranty.

  At this point, just trying to determine if it is a hardware problem, or if I need "merely" encourage appropriate to a FreeBSD driver changes.

  I ran FreeBSD on laptops since 2000, and I have never come across anything like this before.  (Portable computers were Dells in the last decade or so, more recently, a Precision M4400, which lasted approximately 7 years.)  I'll need to replace the laptop of my spouse soon enough so I would be able to get an another M4800 - but she'll want it runs FreeBSD, so, if this is going to be a problem, we will need to carefully assess and consider our options.

  dwolfskill

  I keep the original disc supplied with the machine, so I could re - install that, in view of the detailed, explicit instructions on exactly what to do.

  Hello. You can get job M4800 here mode accuracy

  http://downloads.Dell.com/manuals/all-products/esuprt_laptop/esuprt_precision_mobile/precision-m4800-workstation_Owner%27s%20Manual_en-us.PDF

  This document is in fact a repair with detailed instructions on the replacement of components, including the hard drive, complete with illustrations. The manual can be viewed in a browser, but it works better if opened in a PDF reader.

  The first time you run Windows, you must go through the initial setup - select the time zone & make some choices. It is explicit, because people of all levels of the end, but it might be helpful to have the assistance of a Windows user. For your probably no matter how you complete the Setup you want just finished start up. Windows prompts you to create the recovery media, whose goal is to be able to install the factory to a new disk configuration hard if the original one breaks down eventually.

  Once the computer finishes booting in Windows, if you hear the noise, then it would be a hardware failure such as a bad guess. I don't think you need to do something more at this time, such as files audio performance or connect to the internet. If you do not connect to the internet, then Windows will want to download and install the updates that is not desirable for the purposes of tests, because the updates will change the factory setting. The factory setting is the default configuration in which the audio should work fine. There should be no need to try to adjust the audio controls or other tweaks to try to eliminate a very obvious noise as you have described.

  On the Broadcom adapter, to win a stage I would first try with your current wireless card and ignore the error messages is they pop up. If you don't have the noise on Windows with your current card, assumed that the problem is in the configuration of FreeBSD. If you don't have the noise in Windows then put the Broadcom card back in to exclude from your new card as a factor. [In the past, wireless cards were an important source of noise issues, but not so much anymore, and to the best of my knowledge no would cause great noise in the helmet but not pregnant.]

  The audio driver on the original hard drive will be a Realtek audio driver. There is a way to replace the native Windows audio driver Realtek driver and I can provide these instructions if you want.

  If the problem is caused by hardware that Dell will fix it if you are still under warranty, but it will probably require your machine to have the initial hardware configuration before providing support. If is no longer under warranty, I suggest using an input jack simple usb audio for audio for headphones.

  If you don't have the noise after Windows starts, then the assumption is that the problem exists only in your configuration of FreeBSD. I can't help you with that at all. Maybe someone on our operating system board would have an idea, but I'm not familiar with your operating system at 100%.

  In the same sense I know not how or if the BIOS is for FreeBSD and if or not you need to update the BIOS. I have looked through the notes of all revisions of the BIOS for your model, but see no mention of patches of audio.

  dwolfskill

  I found that the NVIDIA audio devices and RealTek are found by the kernel:

  The Realtek's chip audio codec built-in on the motherboard - the main audio system. The nVidia would be the system audio HDMI - for audio that is sent to another device via the HDMI port. It is a subsystem of the system nVidia graphics.

• A way to be precise with the noise removal filter

  Hello! as the title says, I need to learn a method to apply this adjustment only to the tip inside areas of an image. as I'm sure you know, the filter options remove noise will do the job at the expense of the loss of sharpness if necessary. remove the most noise, lose clarity. It's a blur, actually. so, how can I quickly and accurately make a selection of the only areas of detail/edge of the image (the time factor is especially important if your dealing with a pretty complex picture with many lines - my case, actually)?

  With an image like this, I and just create a new layer with the noise reduction. Then, I use the brush on a mask tool to remove sections of the line of the layer with the noise reduction. It's easy with this, because they are all straight lines, and you can click the top of the line with the Brush tool, shift click down the line to have a very straight and precise line on your mask.

• Drive DVD M4800 Precision periodically makes noise (looking)?

  Cracked open a new M4800 and am annoyed by this problem.  I've not timed but it feels like once a minute, the DVD player made a noise that looks to the reader trying to grab a disc (about a drive to slot).  There is no reason that the reader must be regularly grasping for a disc that is not there... is a more serious problem?  Is this normal?  A way to get rid of it (without remove it and throw the disc!)

  Thank you

  -Nate

  Solved!

  At least seems to be to this day.  I ran the customer Dell system update tool and he finds 2 updates that were not listed on the Dell Support site which was a Firmware / BIOS update.  After installing that I no longer have this problem.

  The machine knows some other issues unfortunately (random Win 7 freezes, stalls)... do not know what to blame again (hardware v. software) but we hope these get better.  GRR...

• Display driver problems and clicking noise with Satellite C670D-11R

  Hi all

  my friend bought a Toshiba Satellite c670d-11r in Germany on a catalogue (Otto to be precise) with Windows 7 Home Premium installed on it.

  After a few months he brought to a computer store and a service in the city, he lives to do a fresh install of Windows. A day ago he came to visit me and complained about how slow it was and asked me to install Windows again and that's what I was doing.

  After installing that I asked him about the CD of drivers he has no idea where he is or if he even had one so I downloaded all the drivers on the site and installed on her laptop except the display driver.

  First I unpacked it in the Appdata path that has been predefined, but that he would not launch after extraction, so I gave in a path custom and tried to run "Installtb.exe" but still once nothing happened so I decided to run the 'Setup.exe', he began installing CCC and after installation, I checked "Dxdiag" but it doesn't always recognize not the GPU in the view tab as in the previous version of Windows, as a "Radeon HD 6320" but as a "Standard video card" I tried everyhing I could come with but nothing really helped, a little later, I noticed a rattling noise where I think the HARD drive should be (to the right of the touchpad) I thought that I broke something , but he said that he noticed that also a few weeks ago by clicking.

  I'll post the dxdiag log now if this will help.

  + System Information +.

  Time of this report: 25/02/2012, 19:19:19
  Computer name: ZLATKO-PC
  Operating system: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_rtm. 090713-1255)
  Language: Serbian (Latin) (regional setting: Serbian (Latin))
  System manufacturer: TOSHIBA
  System model: SATELLITE C670D-11R
  BIOS: BIOS Date: 01/07/11 16:44:54 worm: 04.06.04
  Processor: AMD E-450 APU with graphics Radeon (TM) HD (2 CPUs), ~1.6GHz
  Memory: 4096 MB RAM

  Additional information:
  I'm not an expert at this, I have no epiriance with ATI graphics cards and it's a 64 bit version of Windows, as suggested.

  Thank you in advance.

  + The message was edited: useless info has been removed.

  Hello

  In regards to the HARD drive clicking noise:
  It is nothing unusual can happen with some kind of discs hard I have a few hard drives (internal and external) of two hard drives produce a rattling sometimes noise, but the drive HARD running and working properly so I guess that its ok but nevertheless if possible, back up the data always

  Regarding the ATI driver:
  The laptop belongs to the PSC4AE series.
  Choose the series C670D PSC4AE in driver download Toshiba form European page pilot would show you the driver compatible v8.812.2.2.

  You must download and unzip the package first.
  Now you should see the file TCA0056800E.exe.
  This file must be decompressed too

  Now, go to Device Manager and select the graphics card.
  Here to choose install driver then the manual installation procedure. Now point to the folder where you have unzipped the display driver.
  AFAIK driver for Win 64 bit files are placed in the driver-> display folder
  Usually the Windows operating system must pick up the right files to install the driver

  That s it

• A60 making a lot of noise

  Hi I have an equium A60 and the fan seems to make a lot of noise, other notebooks I've seen seem to be very calm while mine has a strong constant drone to it. I found some places that it could be dust or dirt in the fan or heater. Can I ask that is the problem? and if so how would sort it?

  Thank you, taf

  Hello

  On this way, no one can give you 100% precise answer, and we can only speculate. I'm don't know how old your unit but is perhaps time to clean.

  On this path, vents are clean and the device can catch its breath. If you use the appliance for some complicated process and CPU should work under pressure, it is normal that the unit must be cooled a lot faster to avoid damaging the material.

  Another thing: If you use the notebook as a desktop replacement you can put on something to make it a bit higher (maybe 2 or 3 cm). On this way the unit will be better cooled. Test it.

• Noise on our Board of Directors/pyrometers SC-2345

  I'll try to describe the situations the best that I possibly can.

  We have implemented a package of signals Council (SC-2345) be our controller to a durability test bench. We have also implemented an another SC-2345 to only to acquire the data of 8 pyrometers read the temperature during the tests.

  The problem is with noise on playback of temp. Most of them work properly and we can live with about 5-7 degrees F noise because it is not essential to the accurate precision. We have a few that are about 30 to 50 degrees F noise when nothing works. Then if we turn on our collector hydraulic control, the noise will disappear, but it will be set in another seemingly random way 2-3 pyros. There is no consistency at all with which we're going to make noise.

  We spent countless hours investigation and we found that the shields on the cables have a potential in them. We can not understand, but we have them crashes on one end and that seems to have solved this problem of potential, but not the noise. We also have a potential on our box OR even subject .3V with no reason for to be. We thought that maybe it was a bad ground at the exit of the building, but we tested those and they were put ashore as well as all conduit wire crosses. We put everything on a UPS, and it did nothing.

  Pyros are on nylon materials so they are not picking up interferences of the machine like this. The wires are all performed directly in the modules in the box, so no connection BNC exposed or something like that.

  With all of the tested, than we have done, it seems that the problem lies in the box OR somewhere, but we do not know where.

  Would it be just low power and it's hard to run?
  Any advice on how to locate the problem or how to fix this noise would be great. Also, please ask questions if I can answer so others can read them to be clarified more.

  Thank you

  Patrick

  After countless hours trying to solve this problem, we re-wired and put in the new pyrometers and it worked perfectly. We can entirely blame the bad pyrometers of the original company, we bought.

• CDAQ 9201 noise compared to PCI-6120

  Hello

  I have
  problem with our cDAQ, more precisely with the 9201 tension module. The
  signal resulting seems much too noisy, especially compared to our 6120.
  Could someone take a look at it and tell me if this is the desired result.

  I measured
  three things: an AA, signal pressure gauge and signal battery square signal
  generator. The white line is data measured in 6120 and Red is the
  cDAQ module. I only removed the offset (average) to the battery and the pressure gauge
  measures is easier to see the amplitude of noise.

  Thank you

  Sampling
  Price: 10 k

  Rank - 10V; + 10V

  Hello. So in the end, the problem was in the chassis itself (not module). We had guys here of NOR and tested against its chassis/modules and we found ourselves with a clear conclusion that there is a problem in our chassis.

  In any case thanks for trying to help!

• Will I lose data conversion to double precision single-precision float?

  Before you say Yes...

  I use a crio unit in scan mode interface. Which returns the mode of scanning values in floating point double precision. Apparently I'm supposed to be able to choose between double precision fixed-point ("not calibrated") and ("calibrated") floating point data, but this feature seems to be exclusive to the fpga interface and is not available with the scan engine. The two data types are 64 bits per value, when it comes to the size on disk, anyway is still basically the same.

  The system continuously records 13 channels of comma floating double-precision at 200 Hz. using the binary file write, I measured it is about 92 MB/hr on the disk. (more than 120 MB/hr with PDM and much more to write on the worksheet) In short, this 92 mb/hr rate is just too much data on the disk on this system.

  The modules that I record since, 9236 9237 and 9215 c-series modules, have 24-bit a/d converters or less. Does this mean that I have not need 64-bit to represent the number and accuracy even?

  Can I force/cast point values double-precision floating that I receive of the variables of e/s scan engine to the data type of a different, smaller, as a single-precision floating point and retain the same precision?

  Nickerbocker wrote:
  between noise and precision equipment, I doubt that it makes much difference.

  You can test it by looking at the difference between a DBL and converted to SGL DBL. But I support the Nickerbocker trick. I don't think it will make the difference

• Precision NOR 9263 - NI9269

  Hello

  I just have a question. How the ni9263 and neither 9269 could have the same number of bits (n = 16), the same level of voltage (+/-10 v) and a different precision (9263: 0.11V / 9269: 0.006V)?

  I think that the accuracy of the signal depends on the resolution and the resolution = V/2 ^ n. Now why precision is different?

  Thank you

  concerning

  If you have discovered that the number of bits does not tell you everything

  The resolution of the DAC is not everything. He needs of the CCIP, a reference source (build - in or external), a power supply and amplifier, all rely on a PCB in a box.

  Each part plays a role to uncertaincy/precision, common main enemies are drift (in time and temperature), temperature, humidity...  EMC/noise /...

  And no wonder... part is about twice the cost of the other.

  You can buy a resistance for less than 1 c or > 1000 times this value... the two migth have resistance... Well well, at some point...

• 6035-E high frequency noise reduces the resolution of 14 bits.

  Dear Technical Support Group OR and MF DAQ,

  I don't get the complete 16-bit on my DAQ 6035 - E cards and 6034-E resolution because of the high frequency noise.
  The Test Panel and the actual catches show 1.2 mV peak-to-peak noise with entries is is failed the GA right input in differential ended mode and single connector - Test Panel screen grab and connector attached picture.
  With a range of +-10V, noise LSB + half expected specified in the manual should be only 305 microvolts (20/65536) which is four times less than what I see.
  So far, I've been scanning (a channel) to ten times (60 KHz) the rate I need (6 KHz), then SavGol the filtering and sampling downstairs.
  The problem is that I need to sweep the four channels that now exceeds the capacity of 200 KHz of the card and also results in huge quantities of useless data.

  Have considered buying a new USB DAQ with better record, I fear that all products OR suffer the same flaws and gave the purchase.

  Please, share your ideas.

  Thank you.

  GPSman salvation,

  Looking at your control panel test plot, it would seem that there is a discrete steps on your axis is between - 0.0019 and - 0.0012 or 700 µV.  Then you can see that there is about a little more than 2 discrete steps to your signal, which brings value to about 300 microvolts, exactly as the resolution makes clear.

  You can also find that there is a specification of noise and precision in specification.  You can find for a single point, the accuracy in the +/-10V between 1,085 millivolt.  This is on page 4.  This would allow your signal of +/-1 mV of the expected value, the test also indicating panels.

  Does that help?

  best,

• 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

• Accelerometer: Can I do this with my labVIEW 8.2 Student Edition?

  Dear anyone who reads this,

  Sorry, but I'm still a beginner in this program. But I want to know if I can do this with labVIEW or not: I have an accelerometer sensor, attached to a flat surface. Of course there will be noise, but there will be times of impact forces that causes a significant acceleration to be detected by the accelerometer. I want to put a threshold to a certain extent so that only signals above specified scope will give data. Most of the time sounds will be below the threshold, but impact force will be causes acceleration to go above trigger level - by using a counter (to continually County time), I want to labVIEW to record and give wide/show time (which is recorded by the meter) at the moment the first data point is detected (which is the first data point magnitudes the trigger level).

  Now, considering the impact creates soundwaves and they are very fast, as it takes a microsecond counter.

  Is this possible?

  A simple answer Yes or no would be greatly appreciated. Any additional comments are welcome.

  Thank you

  Hi Bangkok,

  You will be certainly able to do this using LabVIEW, however, so far, the discussion has been clocked by the software approach.  In LabVIEW, rather than use the mask and the limit test VI, I probably just use the base level trigger found VI here instead.

  

  For best performance, you must perform this trigger at the hardware level.  Any of our material of the M series low cost support material analog trigger.  You will program these devices with our driver OR DAQmx.  The installation of this driver includes many examples of LabVIEW which will help you in the right direction.

• 625 x noise specification

  I have a card PCI-6255 that I intend to use for certain sensitive measures. I'm trying to put together a budget-to-end error and I have a few questions. My model is in terms of number of analog-to-digital converter (also known as the LSB in your datasheet). In the table of absolute precision on page 5 of the 615 x standard OR I see a column called random noise, (uVrms). I think I understand the residual gain error, offset error residual and associated with it and the INL error, but random noise is confusing to me. Here's why: on the +/-2V of type range, the random noise is 16 uV.  On this beach, the resolution of the ADC is 6.1 uV so random noise is about 2.6LSB If I look at the +/-5V Beach, I see a random noise of 140uV.  On this beach, the resolution of the ADC is 305uV so random noise is well under a LSB. Therefore, in the budget of my mistake, I can use "1 LSB" for noise random when on the beach of 5V, but I have to use LSB '2.6' or '3' when the type 2V range. I expect a signal of about 150 mV riding on a 2, 5V CC.  I was worried, I might need to compensate the signal (remove the 2, 5V dc) in order to use the +/-gamme.2 volts to get the best resolution.  Also, I thought that I would get better sound performance too.  In looking at the figures here, but looks like I'd be better off using the +/-5V range (assuming that there is enough resolution) because the readings have less noise counties (even if it's more noise volts). I can explain the error of Gain and Offset error by injecting known signals and making a "correction of the software.  Not sure, but I think I can correct for the INL also if I use a 2nd or 3rd order polynomial.  It is the random noise, I have problems understanding. Here's the question: what is the random noise in table AI accuracy for 625 x boards?  Can you give an example of how NEITHER could have measured it? Secondly, note 2 says "sensitivity is the smallest voltage change this canbe found. It is a function of the noise. "He measured with a signal to noise ratio of '1' or '2' or some other standard, or is it a calculated value? Thank you MG

  The function of Gaussian Distribution is often used to describe the noise. Random noise spec'd in the table of precision is a gap type distribution of probability of noise and was probably calculated using statistical analysis. That's why the uncertainty of noise takes into account a 3 coverage factor that represents the largest part of the distribution.

  

  

  With respect, the specification of sensitivity, this requires a more detailed explanation, but it is essentially an industrial standard that takes into account more statistical analysis on a signal when awarded with noise. According to me, the mix is a compoenent of this measure.