Signal noisy and shielding techniques

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• System satellite M50 Windows noisy and distorted noise

  Hello users. The years of use of laptop Toshiba, it's the first time, none of them developed a fault, from one day to the next: after hibernation, my windows sound system became noisy and distorted. Interestingly, other sounds that work very well (like listening to a mp3 or wmv file). I checked all the equipment settings and sound system drivers and everything seems to be squeaky clean. I am at a loss for a solution.
  A that someone has experienced the same problem? is this a problem of Windows rather than Toshiba?
  Any help is appreciated.

  Thank you

  Hello

  I've never heard of this problem. If there is some sound problem it takes usually affect on any type of sound playback.

  Plateau to roll back the OS to an earlier time, if you can find any what systemcheck restore point in System Restore tool.

• PCI data acquisition and Signal controller and SM Bus controller drivers are not installed

  My laptop is Toshiba satellite L305 with Intel Pentium (R) Dual CPU T3200 2 GHz / 2 GHz.

  Rescently that he has been upgraded to Windows Vista Ultimate Edition, 32-bit operating system. Since then, my USB device wireless to connect to the internet is not worked. The Device Manager displays a yellow! Select this option for PCI Data Acquisition and Signal controller and the Bus controller. The details for the two area said that pilots are not kept.

  How can I get these drivers. I'll appreciate your help, thank you.

  Carlos

  http://www.CSD.Toshiba.com/cgi-bin/TAIS/support/JSP/home.jsp

  Toshiba support at the above link

  http://www.CSD.Toshiba.com/cgi-bin/TAIS/support/JSP/home.jsp?NAV=download

  Toshiba Driver download at the link above

  http://laptopforums.Toshiba.com/

  Toshiba laptop Forums at the link above

  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  Access the site of the manufacturer of your laptop to the link above > drivers and downloads Section > key in your model number > look for the latest Vista drivers > download/install them.

  The computer you are using now if you have an Internet connection with the other > download / save drivers > copy them into Flash Drive > transfer / install on another computer/laptop.

  See you soon.

  Mick Murphy - Microsoft partner

• HP photosmart AIO 7525; noisy and too long to print

  HP photosmart AIO 7525

  connected to a HP windows 7 64 bit

  It is my printer 2nd in 2 months (same model # from the same store).

  First, I went back to scratches and that I could not solve the problems of alignment.

  This, it is extremely noisy; It takes a minimum of 50 seconds to even begin printing, looks a keurig coffeemaker, and it continues to operate after the print job. Looks like it's lining up or clean the printhead everytime

  Initially, it would not connect to web services; but after 2 hours, I got it to work.
  In printing a page of a web page, the only thing that printed was clearly the company to the top, the page number, address date and files below. All him rest isn't clear (like the rest) and the characters are shredded and not aligned.

  Any help on these questions or I am going back this one too?

  Thank you

  No, it does not.

  the update does not apply to my system

  Win 7 64 bit

  I think I can just return it too

• Portege Z830 - fan noisy and almost always running

  My new Portege Z830 has the issue of noisy fan and almost always running which has been said here before.

  Recommendations were that we download bios 1.6. But I checked and that the version is already installed on my machine. I also adjusted the power save mode battery parameters as others have suggested. But that made no difference,

  All the other tips has been give in technical language far this beginner.

  If anyone has any suggestions they might put in words of one syllable and the step by step instructions, I would be eternally grateful. Thank you.

  I found also two documents from Toshiba on exactly this topic and as saying that update BIOS version 1.60 or higher would solve the problem

  Portege / Satellite Z830 high cooling fan speed.
  http://APS2.toshiba-tro.de/KB0/TSB23039P0000R01.htm

  and

  How can I improve the control of the FAN on the Satellite and Portégé Z830?
  http://APS2.toshiba-tro.de/KB0/FAQ22039H0002R01.htm

• Tecra M5 - fan is noisy and constantly lit

  I have a new Tecra M5, to replace a M400... The M400 at first had a very noisy fan but Toshiba provided an update of the BIOS to reduce, which was good!

  The M5 does not have this luxury, the fan is constantly on and I know that the goal is to keep cool.
  But I know from experience we Shouldna´t have to be this strong. Someone at - it experience the same problems or know of a fix?

  Powersaver tool does not appear to reduce this and I noticed that the two options is grayed out and disabled now.

  Hello

  > The tool powersaver doesn t seem to reduce ve all and I noticed that the two options is grayed out and disabled now
  What options are just grayed out?

  I just read your first thread on the wrong BIOS update. It seems that you have updated the wrong BIOS on your laptop. Am I wrong?
  Have you noticed this fan behavior before update BIOS?

• Satellite M40 - 130 fan noisy and always on

  Hello
  My M40 is brand new, purchased in July 2005,
  and it becomes to be very noisy, the fan runs always, even though I have change the power setting.
  an idea of the problem? I think it's abnormal, because he was so quiet and suddenly, for 3 months, I think the fan began to turn and now I won't stop.
  In fact, it is quieter with my linux ubuntu breezy with xp home sp2, I don't know what the problem...

  need help please, this noise is driving me crazy: s

  Thank you.

  Hello

  To clean the vents, you can use the vacuum tube.
  Also, make sure that the laptop has a free space near the fans.

• Signal strength and range of the latest wifi routers

  I have a big house, with my router (BT home hub) in a wiring closet in a laundry room. The House is wired for ethernet and my current Wi - Fi, a Netgear WPN802, is placed at the best discreet place in the House. It is quite visible from everywhere in the House, the signal is quite low in some places.

  If I replace it with a common Netgear router, switched to AP mode, I see a significant improvement in the strength of signal and the beach? Smartphones, tablets and streaming music boxes (Sonos) are the usual wifi customers.

  In general, with one exception, hand-off is controlled by the device. On devices where the roaming aggressiveness can be adjusted, usually of the laptops and PC with Wi - Fi cards, it is sometimes possible to do hand-off low impact, but it is often neither transparent nor without interruption. I walk often so, personally, that this is not a matter of my house with my laptop streaming.

  However, smartphones often do not have adjustable settings of roaming aggressiveness, but it is precisely the devices with which we want to transfer transparent. My old iPhone 5 was terrible to homelessness at home and at work.

  If you install a second WAP in your House, don't expect transparent transfers. But, as I said, it's usually to the device.

  I talked to an exception almost, and perhaps two. One is that there is a connection Wi - Fi standard 802.11r called which rudder hand fast shipment. I don't think that any consumer connection Wi - Fi gear to implement. Two is that Ubiquiti Networks offers an exclusive feature called discount zero where several Ubiquiti APs can work together in the hand-off a device between them. I don't know which of their products offer this feature, but my guess is that they are not cheap. The disadvantage of this feature is that all points of access must use the same channel Wi - Fi (they do all access points appear as an access point). It is not so good, if you have many Wi - Fi devices and need a lot of bandwidth. It is a compromise between speed and reliability.

  I would recommend that you try one of the higher end Netgears with external antennas. If you are happy with your current router and only need an AP, consider the EX7000. It is marketed as a wireless extension, but it is also usable as a wired access point. It'll be cheaper than the R7000. But if you want to improve your router, then the R7000 is an excellent choice. I have one and it covers almost my entire House, 2 storeys.

• LTE application: Signal PSS and EU synchronization problem

  
  

  Just as I suspected, samples received on the receiver side are only cross correlated with the PSS sequence (PCI mod 3) = 0, this is the reason why the synchronization does not work when the eNB transmits with a (PCI mod 3) 0. The PSS sequence (PCI mod 3) = 0 is integrated as a time fixed signal of the domain in the FIR filters although (the two who treats I and rated a Q of the received signal handling complex). To change this and to implement a different sequence of PSS, should open the basic FIR blocks Xilinx generator and change the sequence.

  I got some guys from support LabVIEW Communication an updated version of the "LTE Cross Correlation.gcdl" function that implements a selective control for the value (PCI mod 3) and seems to change the PSS sequence within blocks of FIR. I post here if someone has the same problem. Although I have not tried myself yet.

• Using Labview and PXI-4461, how can I AO0 output Signal Square and AO1 output waveform

  I am using PXI-4461 and Labview, boredom, generating 2 signals simultaneously.

  How can I get AO0 out square and exit AO1 SignWave?

  Help, please. (The example Code would be nice)

  Thank you.

  Create two signals and make a table with them.  Use DAQmx Create Virtual Channel to create two channels.  First waveform will be sent to the first string, second waveform on the second channel.

  I understand not all as calendar, clock frequency, amplitude, trigger and other parameters.  You can add these things.  This is just a basic example.

  

• signal average and relaxation

  I know how to program to acquire the signal. But I donot know average and raise my signal as a work of the oscilloscope? What do I have to use "average dc - rms VI" to calculate the rms dc values and/or a waveform of input on average?  In oscilliscope, I can choose average 16,32, 64... 512. how to achieve here? There is also a filter of bandwidth in the scope.

  The trigger is nothing but looking for a crossing of a certain level.  You can use a simple top or a less than to find that.  On average, as a scope, you must acquire the signal several times.  You can then perform the average for each data point in a loop FOR.

• Problem when the PWM signal combinning and analog signal TOGETHER!

  Hello everyone,

  first I DAQmx 6212, and I need to run the water pump small (9V - 16V) that should be driven by a PWM signal; I also have a motor (5V - 13V) for a water supply which must be controlled by an analog signal and it has built in a force feedback potentiometer, I logged onto this potentiometer correction + 5V the DAQmx and used the output voltage of the third extremety as a value to diagnose to know the position of the engine.

  My VI shows:

  1 is a normal meter production to create my PWMout signal.

  2 is an analog input, I use it as a PWMin to the LabVIEW to diagnose what is happenning in my pump water through the cycle and frequency.

  3 is an entry of the third extremety of the analog potentiometer.

  4 is an analog output that I used as power supply of the motor valve and I used an AC/DC amplifier for aplify signal the DAQmx and the motor road, between the two (3. 4.) I made a comeback with a few calculations, I had a P-controller to know the real position of the engine valve.

  My problem:

  When setting to 1. and 2. in the same VI only, I get an own PWM output with no problem.

  also with 3. and 4. in the same VI only i can control the motor valve without any problem.

  but when I put all these 4 set found in the attached VI, I have a problem as the engine valve turn continuously without stopping even if I change the position of the valve between 0 and 100%, I should mention that I see a PWM normal outside a signal on my oscilloscope, another thing to delete one of (1 or 2)  and run the engine valve VI works fine without any problems.

  so this my problem, if you can think of any solution please let me know.

  Thanks in advance for your help.

  Kind regards

  Caliente

  Here's your VI, slightly modified so the two analog inputs belong to the same task.  This if only for purposes of illustration, I him have not tested.  You will still need to do some debugging.

  While changing your VI, I noticed another potential problem with your original configuration.  You have configured the two tasks of AI for the same frequency, but read you 10000 samples of one of them and only 100 samples from the other (and throw it most of it).  Data acquisition data are buffered, and if you read as fast as you acquire, the buffer fills eventually.  If you read 10,000 samples of a channel, and the other channel acquires at the same rate, then when you read from the second channel you will get old stale data or an error full buffer.

• Multiplexing of signals microvolt and conditioning of the right signals

  Hello

  We have 22 signals in our system. We must be able to measure any subset of these 22 signals. Usually, we carry out a number of measures IV 4points of separate devices on a SUT (sample to be analyzed). Two of the 22 signals may represent the pair of voltage measure 4-point IV, depending on how it was KNOWN is bonded. The level of the signal of tensions is in the 100s in the uV range and I need a precision as much as possible, so the unit or same sup - uV numbers. So far, we had all the 22 signals connected to a box (selfmade) acting as a distribution point, where a connector (SMB) is available for each signal. We then manually choose which two of the 22 that signals will be connected to a differential amplifier silent instrumentation (also selfbuilt), according to it was KNOWN patterns of liaison. The amplifier with a gain of typically 1000, returns the signal to an acquisition card. The current (excitation) is read separately.

  There is a problem with that. We need to manually switch the connectors in the distribution box to select a different device on it was KNOWN and flows to the amplifier. This is not good for a number of reasons that I can't go here.

  Therefore, I would like to multiplex these 22 signals to several outputs (for future scalability) who will be wired for the conditioning of signals. There is no manual connection/disconnection of these signals in this way. The first question is: can a matrix switch or multiplexer be used to route signals reliable microvolt? If so, then what kind: electromechanical, Reed relay or a transistor? Is the thermal EMF in the specifications of multiplexer/matrix relay just a lag, or is - that noise?

  The second question is: what card/signal acquisition solution (so no selfmade equipment and legacy) products OR only using the same line that the matrix/mux can reach 1uV accuracy of treatment? For us, offset offset is not a problem since we measure the device in 2 quadrants and later cancel it in the software but the noise (and get the accuracy) is important. Our amplifier has a background noise of 3nV/sqrtHz and a bandwidth of 15 kHz. The system to replace must be comparable. I have the choice between:

  • the SCXI based ones, instrumentation isolation (4ch) 1121 or 1122 amplifier modules (16 channels), with a ground noise that I calculate 20 and 30nV/sqrtHz respectively. They already have some functions of multiplexing btw.
  • the PXI 628 x with a background noise that I calculate through 10nV/sqrtHz
  • the PXI 446 x with the noise floor low 8nV/sqrtHz as stated in the technical data sheet

  Module 4-way universal 24-bit NI 9219, who works with 2 samples per second has a very low noise total, but at a very low sampling frequency and I can't consider comparable to what we have now. In addition, the system must be able to have a few kHz bandwidth for dynamic action in the future.

  Y at - it any other ideas?

  Greetings
  Aleksandar Andreski

  
  

• wiring of remote sensing and shielding to the Earth, 9237 requirements

  Hi, I have a set of scales (full-bridge) connected to a 9237 (in a 9172 chassis), and I have two questions regarding the wiring:

  (1) requires remote sensing that you have two additional sons detach from the cell, to the place where the wires attach to the wheatstone bridge?

  (2) where I should connect the shield of the load cell 50/60 Hz noise? to the Ex-terminal (as well as the Ex-fil)?

  Thank you

  Claire.

  Hi Claire,

  (1) Yes.  Drivers of remote sense must be connected to the points where the voltage wires connect to the bridge circuit.

  (2) Yes.  The shielding must be connected to the reference of the unit, who is the EX - for the 9237.

  See NI 9237 Instructions and specifications manual and this DevZone for more information.

• Frequency of an analogue signal measurement and noise reduction

  Hello everyone.

  I'm reading a flow rate sensor that generates output signal square whose frequency has a linear relationship with the flow rate and varies from 37 to 550 Hz. My hardware does not support playback of the frequency, so I have to calculate. What I ended up doing was reading signal every 1 millisecond (1000 Hz), taking two samples spread and store the value of the signal and the time during which it was read. Every 400 milliseconds, I loop over the data and know how many cycles have taken place and the time between the first and the last cycle, divide the number of cycles at this time here.

  Here's a graph of the signal.

  

  I never use software loops timed then performing operations of data acquisition as a general rule. He's many trendy on negative issues. And as you mentioned that you cannot run a timed loop faster than 1 kHz. You should go to the Help menu in the toolbar, then select search examples. Then you look up "continuous acq. It is best to leave all the details of the calendar to the data acquisition unit and just retrieve data from the buffer of data acquisition, then it is needed. I have your case I would recommend a sample equal to 6 kHz freq. That's more than 10 times your highest frequency. You can always update your data at intervals to 400msec. Your signal also looks good. I can't have a lot of noise in your signal. If my guess is that your software is not optimal. You should not get 120 Hz, so there is no flow. If you post we can take a look.