Help the spikes of voltage high frequency Counting

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• 6722 to higher frequencies (about 3.125 kHz)

  Hallo,

  How can I control the PCI-6722 with higher frequencies about 3.125 kHz? Is it possible to use Labview? How? If it is not possible, how can I control the map to higher frequencies and visualize the information in Labview? I have not found a link to get manuals etc. that help. Links are welcome.

  Thank you

  Verena

  The PCI-6722 does not support the entry of digital waveforms.  It's digital lines are static (unbuffered), and every acquisition of waveform of them must be software controlled.  Since modern multitasking operating systems are not deterministic, this translates into large amounts of jitter in when samples are collected.  If you need good digital waveforms entry, you will need a different card.  However, the 6722 has two counters/timers, so if the function you are trying to run is less their capabilities (for example to determine the frequency of a digital input signal), you should be fine.  Let us know which task you want to accomplish and we can point you in the right direction.

• multi channels data acquisition, a single frequency, counter a pulse, two voltage inputs, a power meter (by USB) and an analog output spontaneous and recording

  Hello

  I have a power meter which provide the USB driver and a Labview program to get the data and NI USB-6221. The project I am currently working on the needs of:

  1 acquire two signals (inputs of simple tension), pressure frequency KHz

  2. acquire a flow signal, the output signal is 0 to 5V pulse, each pulse means 0.4 ml volume. So I use a voltage inflows to count impulses in certain period of time (in this case, 1 S) for water flow. ; KHz sampling frequency and the 1 Hz update rate

  3. acquire a signal of engine speed. The output signal is pulse square wave whose frequency is related to the speed. I use a REIT port to measure the frequency. Sampling rate: Auto

  4 give output voltage sine or square wave, I use AO do that.output rate: Auto

  5 acquiring by VISA electricity meter data.  Data update rate: every 50ms

  Currently, all the 5 tasks work well separately. But when I put them together, some signals are beginning to hang, for example, pressure signals sometimes give nothing.

  Another problem is the data record. I programmed the VI in such a way that whenever I press the button 'save start', he begins to record data and save them in a .cvs file. For some reason, I always get only the data in the first table. Coult someone help me? I download my code as follows

  Hello

  What I meant by open, write, close.  For any type of file you are using.

  Open the file, which produces a reference, then put the mention in a registry to offset.

  Write data, using the function write (for this type of file) and the reference.

  When you are finished, close the file reference.

  Writing in the spreadsheet opens, written, close all at once.  It is very good for this type of application.

  ***

  The issue of the loop is more general.  I would like to say first of all, I want to say that since each loop works on its own, it is own VI, and that this program has put all this into a single VI, which has a method to solve the problem is to disable all the loops and allow them one at a time to see if there is a culprit responsible for.

  Using multiple loops executes the code at the same time, and some loops would be cycle faster than others, especially if some of them are loops just as they are.

  Communication between the loops is a test to the address if necessary.

  Running all these signals through different loops DAQ must also be examined.  Don't know what questions are for read and write somewhat randomly in the channels.

• 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,

• Connection of the PXI-4071 - can sound and LOs remain interconnected for the impedance of the cable 2, voltage DC/AC, frequency and waveform acquisition?

  Hello

  We use the DMM and SMU-6363 map to test a hardware device.  We will also use a PXI-2530 b switching matrix.  We will use the digital multimeter to perform the measurements of voltage, DC and AC, measurements of impedance (2-wire and 4-wire), frequency and waveform acquisition.  Can the PXI-4071 left be 4 wire connected (black jacks taken connected and red connected) mode and still be used to perform all other measures (including 2 impedance of the cable).  This would simplify the switch connections.

  Current measures use the son + and LO, but the HI and S-can remain connected.  The problem you are having is if you have an active device the digital multimeter and take you a 4-wire resistance and the measurement of voltage with all 4 wires connected and then change to a current... When you do this, short-circuit you the terminals of the DUT, on that you just take the measurement of the resistance.  If the terminal HAD, say, a power supply 10V, then you have just shorted out.  Of course, this isn't a problem if your Instrument is a passive device, or if you change just the unused two lead whenever there is an active device of low impedance.

  If you want to make voltage, current and 4-wire resistance, you need all 4 wires.  If you want to do the voltage and current, you will need 3 wires, but you could connect the s + Hi and then just do the two wires.  I vote running every 4 son to your DUT for maximum flexibility.

  2-wire resistance is a must if you are measuring resistance above 10 MOhm.  Alternatively, you can use 4-wire for all measures.

• SQL help, how to group in column A and then get a higher frequency in column B?

  Assuming that the following table, operation represents each type of operation of transaction
  Employee table operation another column c
  ' < ' id1
  ' < ' id1
  ' < ' id2
  ' *' id3
  id1 ' / '.
  
  question, for each operation, which employee do the most? which employee do the 2nd most?
  I thought I need to group by operation first, then get the frequency of the employee and get top 1, or at the top of page 2 of higher frequency.
  But I'm struct and don't know how to write sql code.

  998408 wrote:
  Assuming that the following table, operation represents each type of operation of transaction
  Employee table operation another column c
  '<'>
  '<'>
  '<'>
  ' *' id3
  id1 ' / '.

  question, for each operation, which employee do the most? which employee do the 2nd most?
  I thought I need to group by operation first, then get the frequency of the employee and get top 1, or at the top of page 2 of higher frequency.
  But I'm struct and don't know how to write sql code.

  Welcome to OTN. OPS! Posted in the wrong forum. Just after in {forum: id = 75}. Before posting it close this thread as answered marking.

  If someone answer is useful or appropriate, please mark accordingly. *

• Satellite R630-145 - high frequency beep

  Hello!

  I'm of the Russia. Excuse me for my English. I have a problem. My laptop beeps. High-frequency sound (noise) breaks out of aperture for fees. When the portable computer fresh tone gets stronger.

  How it can be fixed? Is it a serious problem?

  Help me please.

  Hello

  Can you please explain what more this question beep?
  When your laptop begins to emit beeps and what exactly happens?

• Re: Satellite R630-130 - silent high frequency squeak

  I have Satellite R630-130

  I hear a grinding of high-frequency quiet boring when I put any device in USB (mouse, for example).
  The location of Squeak is the "caps lock" key
  When CPU loading more than 50% or I'm in the BIOS the squeaking is disappears.

  How to cure that?

  Hello

  Hmmm, I read about a very similar problem in this forum and only the update of the BIOS might help.
  http://forums.computers.Toshiba-Europe.com/forums/thread.jspa?threadID=52506&start=0&TSTART=0

  The same high pitch noise was noticed and discussed in the thread above.
  It was related to the frequency of the processor (C4 noise) or something

• Portege R700-172 high frequency twittering

  Hello
  anyone experienced a high frequency of the Portege chirping. I admit just a few days. Twice I had such a sound and wonder what it is (it is not the typical fan noise.)? I disabled speakers, but this wans't ' the source of it t...

  It will be difficult to address this issue on the forum.

  Look closely at what will happen in the future, and if this keeps happening again and again I recommend you contact the nearest Toshiba service provider and ask for help.
  In general your Portege should bring up some strange noises.

• Model PWM measurement for continuous samples on higher frequencies (100 kHz) with SemiPeriod(HighTime / LowTime)

  Hi people,

  I have a challenge I'd like to discuss with you and hope to have some ideas and maybe a solution.

  I have a systems acquisition (DAQ) Multifunction National Instruments NOR-PCIe-6353 means X-Series!

  I would like to generate and measure signals pulse width modulation .

  DRIVER:

  OUTPUT:

  FREQ: 0, 1 Hz - 1 MHz

  Duty: 1-99%

  Change the setting on the fly

  (This works very well and is implemented)

  ENTRY:

  FREQ: 0.1 Hz - 40 kHz

  Duty: 1-99%

  Method of measurement: period of semi / ContinuousSamples / AsyncCallback

  Here, I have problems I am running only on an Intel Core 2 Duo CPU E8500 @ 3, 16GHz.

  And I want to run 2 PWM_IN and PWM_OUT 2

  Low frequency work fine!

  0.1 Hz - 20 kHz

  It is a loopback with

  myCounterReader_1.BeginMemoryOptimizedReadMultiSampleDouble (2, myCallback_1, myPWM_IN_1, myPWM_IN_1_Data);
  
  Data = myCounterReader_1.EndMemoryOptimizedReadMultiSampleDouble (ar, on myPWM_IN_1_Data_actualNumberOfSamplesRead);

  A higher frequency do not work very well!

  20-40 kHz

  I get exception Code of State-200279:

  Attempted to read samples that are no longer available. The requested sample was already available, but has since been replaced.

  Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

  Property: Value of NationalInstruments.DAQmx.DaqStream.ReadRelativeToRequested:

  NationalInstruments.DAQmx.ReadRelativeTo.CurrentReadPosition

  Property: NationalInstruments.DAQmx.DaqStream.ReadOffsetRequested value: 0

  Task name: NI1_PWM_IN_ctr0

  State code:-200279

  40 kHz, period is 25us = 12, 5 HighTime and 12, 5 LowTime 50% DutyCycle

  This means that each 25us I get a reading of 2 samples the HighTime and the LowTime

  I charge my task of Max, so here's the Setup (sorry its german):

  

  1 can someboby you explain to me what the MemoryOptimized?

  2 Zu lesende values means that the size of the buffer 10 is not much but increases the size of the buffer to say 10,000 needing help on

     a longer time! 

  3. playback of data more frequently is not possible because the data are under tension, because it is

  4 specify a fixed number of samples I der number is HighTime 2 and LowTime

  5. I have does not start and stop the task! Is it better to start and stop the task each time while I still may have a new buffer?

  I hope someone has an idea for!

  By

  Steven

  Reading with 50 software we period - bad idea, you will jump impulses. Try to use DAQmx Read Overwrite property, set it to "crush the unread samples" - it will overwrite the impulses without error.

• HIGH FREQUENCY OSCILLATOR circuit

  I need to generate barcodes random using a timer 555 operating at high frequency and connected to a pair of JK Flip flops of installation as a 2-bit counter. May I ask is my correct circuit?

  You answered your own question. If you try to run it outside its maximum frequency, you may have irregular gusts. For reliable operation, use the 555 (or no matter which component) in the specifications. If you need a higher frequency, you need a different design.

• REGZA 40 "LCD TV emits noise high frequency

  A few months ago, I was lucky to win this TV, a 106 cm LCD Regza HD display.
  I was very happy because I could never afford it myself, and I am very happy with its performance in general.

  I found however is that it emits a high frequency noise that triggers tinnitus in my hearing. (For tinnitus are a squeaking noise acute heard by people who have damaged their ears, sometimes called ringing in the ears).

  I guess that my hearing is already sensitive listening to lots of live music over the years, but I think that this noise is excessive.
  I think that a monitor of this size is by using a good amount of power and maybe feeding could be too work itself.

  The monitor makes this noise at a constant level even before the start of the sound of the TV show.
  I'm curious to know what the suggestion forum users to reduce the background noise?

  The monitor is still under warranty because it is only 6 months old.
  I wanted to be prepared to discuss with the Toshiba warranty people if the forum users can suggest, first, what could be the cause of noise and on the other hand, the possible ways to address the issue.

  Thank you petekey4

  Hello Pete

  As you can see it's Toshiba computer forum and I do not think you will find a lot of people here who want to discuss LCD Toshiba TV.
  In any case, if the TV is new and with valid warranty the best option for you is to contact the service people and let check your new TV.

• Satellite A45 - the CPU usage is high and slow applications

  Hi all

  I'm trying to debug a hardware problem on my Toshiba Satellite A45. I am running Ubuntu 10.04, but I don't think that it's operating system or related software.

  THE PROBLEM: The CPU usage is high and applications slowly to a crawl after using an intensive application of memory for a few minutes, i.e. to watch a video or a game. Basically, anything that could use the screen much. If instead, I work only from a prompt, even when the application could do a lot of work, I do not encounter this problem. After stopping all applications, the CPU usage is always higher than normal (90% idle, should normally be slowed down to about 99%).

  Xorg now typically showing about 6% (normally use< 2%).="" if="" i="" at="" any="" time="" after="" this="" try="" to="" work="" in="" any="" application,="" usage="" is="" still="" bogged="" down.="" only="" a="" reset="" gets="" me="" back="" to="">

  Note: My system has always worked very well and I did not made the installation of the software or changes when it started to happen.
  However, the laptop is a 800 miles round trip at the rear of the car in a padded bag.

  DEBUG: This doesn't seem to be the RAM that I replaced the RAM and reinstall the RAM, and the problem persists. This doesn't seem to be the hard drive that I can try to run it from a Live CD (without use of HARD drive) and yet everything slows to a crawl.

  HELP: I don't know how to debug from here.
  I don't have extra pieces of hardware to make swaps.

  Any ideas more how to debug this?

  Thank you
  Grommit

  Hello

  > I am running Ubuntu 10.04, but I don't think that it's operating system or related software.
  It s interesting why you think that this may be software related issue

  I think that it is a typical software problem because the RAM and the HARD drive has been verified you have reported this in the message

  So what to say maybe some virus or malware likely to obstruct the CPU and the memory usage
  Or there is some process in the background that are not properly

  I recommend you to reinstall the Windows operating system or another distribution of Linux that runs NO Live CD, but which is installed on the HARD drive
  I m sure that s kind of the process that is disabled and crashes somewhere in the background

• Compatible with the iPad 2 or higher?

  I read in several places that this app is supposed to be compatible with the iPad 2 or higher.  I have new IOS, a model #A1395 IPad2, & over 3 GB of space, still can not download because of the error "no compatible device.  I use an Idock & do a musical production already on GarageBand on this device made to this device, so I was really hoping to try this new application on that rather than my phone.  Help?

  Same problem here. I think I read somewhere that the musical notes needs an A6 chip. GarageBand on the iPad 2 did not feature Live Loops which is on my iPhone 6 more.

  TT2

• The CPU temprature is high

  Hello

  I need a software tool to monitor my CPU temprature.
  My laptop chrashes if I start the applications and I think that the CPU temprature is high.

  Tanks for help,
  by F_E_O_S

  Hi Enrico,.

  You don't say what model of laptop you have, but I strongly recommend to remove any accumulation of dust etc. the heatsink from the CPU and cooling fans.

  Also to ensure that there is sufficient air circulation around the laptop for good cool the CPU. If the fans are running high-speed quite frequently this will normally indicate insufficient air flow in the radiator.

  The Toshiba power management utility has a setting to set the cooling fans to give you two maximum performance of CPU (i.e. maximum of cooling) or quieter operation (Minimum cooling), I'll make sure that it is set to your needs (available in Control Panel).

  HTH