How to measure the frequency of sampling (s/s) in LabView FPGA?

Similar Questions

• How to measure the frequency of a clock using meter in LabVIEW?

  Hi guys,.

  Someone knows how to measure the frequency of a signal introduced in LabVIEW (in the FPGA PXI-7813R), using a counter in LabVIEW?

  Essentially, I want to use this counter as a kind of Logic Analyzer.

  Thank you, Anoop

  I don't know what you mean by "manual".  It is all managed in a housing structure.

  

• How to increase the frequency of sampling of several sensors via RS - 485 and writing files of measure?

  I have a vi that:

  -Locate the USB port that RS485 communication device is connected

  -sends a command to each sensor

  -reads a response from each sensor

  -performs a calculation on the answer

  -saves the response to a file of measure

  I used a flat sequence to query each sensor.  I am trying to find a way to modify this vi in order to increase the frequency of sampling on the sensors.  Currently, it takes 2000ms for question 4 sensors and write tot the measures file.  Anyone have any ideas on how to speed up by programming?  I am concsidering on the purchase of a device USB DAQ (USB6000) and rewriting of the vi.  I was wondering if there was some tweek I caould make on the vi.

  Thank you!

  I meant put the time-out on the line, then the reading will be either timeout after 200ms or read the 2 bytes.  Whichever is faster.  Then deletes this 200ms waiting you.  I have attached your vi to show you what I wanted.  I did not notice that it is a hardware or wither then you might want to look in the data acquisition functions.  It will clean up your code and are very easy to use.

• How to measure the frequency of NOR-DAQmx RPM tasks

  Hello

  I'm trying to measure the frequency using the NI DAQmx task and then convert it to a RPM if possible.

  I have the following material available to me.

  I have a block SCXI-1327 terminal, as well as a 6289 PXI multifunction data acquisition Module SCXI 1126.

  I wired in a mag ai7 sensor on my 1126 and then of the passage of an object metal I get a range of 6-8, so I am able to read the mag sensor.

  What I'm trying to do is somehow convert this analog measurement a RPM using the NI DAQmx task only.

  Any help would be appreciated.

  Hi, smooth,

  Yes, you would select linear, then put in the result of this calculation of the slope.

  The Manual recommends a minimum frequency of at least 15 Hz for setting low range. This card is not really designed to measure the frequency for a single pulse over a long period of time.

  The number of LAPS down (assuming one pulse per turn) that we recommend that you measure with the 1126 is so 900 RPM. If you need measure low revs, and you cannot increase the number of impulses per turn, you could consider either read the signal as an analog waveform, or if it's a digital pulse, using a counter to basic task. In this way, you can use any method you want to handle the situation where there is only a single pulse in a long time.

• How to change the frequency of sampling DAQmx during execution?

  Hello guys. I'm using LabVIEW in the measures of the frequency response function. My application requires the sampling rate to change according to the frequency of the signal during execution.

  I tried to do it with a "structure of the event" and it works well when I change the rate manually via the front control but it backs do not work when I set up the sampling frequency to vary automatically (just a frequency sweep). Photos below:

  Why not the structure of the event feels the change in the value of "rate"?

  Thanks in advance for your help.

  Lucas

  Hello

  In "automatic mode" to change the sampling rate, the calculated rate is written in the local variable (as illustrated in the code).  Structure of the event does not change value in the local variable as an event.

  In order to make the structure of the event to recognize the change in value of an indicator such as event: write the new value to the property "Value (Sgnl)" corrosponding node to rate indicator (see figure below).  This will make the structure of the event accept the value change in the indicator as event.

  Note: Use architectures such as producers and consumers for such applications, which makes the application readable and expandable.

  See rear queries if any.

  

• How to lock the frequency of sampling for 5673 and 5663

  Hello

  In general I try set the transmitter and the receiver.  It seems easy to lock the carrier frequency, but no matter what I do, I seem to have a drift in my sampling frequency (order of 1 ppm).

  Is the sampling clock in the digitizer 5663 linked to the same reference like OL clock?  ... I didn't know that I needed the mechanism TClk here since I don't care for delay...

  Any thoughts are greatly appreciated.  Here are some details.

  I use the 5673 as transitter and 5663 as receiver.  I noticed as follows:
  1. when each use a "reference clock Source' = OnboardClock I have a carrier notable offset to the receiver (for example carrier 5.8 GHz has ~ 7 KHz offset) and that's fine.
  2. when each use a "clock reference Source" = clock, with the physically attached chassis PXI, I see no delay perceptible carrier to the receiver.
  3. what 5673 uses 'Reference clock Source' = OnboardClock, using 'Reference clock Source' 5663 = ClkIn (ClkIn/Out physically attached), I see no delay perceptible carrier to the receiver.

  
  

• Measure the frequency of the pulses PXI-6624

  Hello.  I work with a PXI-6624 and am interested to make measurements of pulsed frequency for frequency and duty cycle on its inputs using DAQmx.

  When I go to create the virtual channel, however, I have error-200431:

  "Physical channel selected does not support the type of measure required by the virtual channel you create."

  ' Asked the value: pulse frequency.

  «You can select: frequency, period, pulse width, period of Semi, separation of the two edges, Position:...» »

  Is this card really not capable of doing these measures of pulse frequency?

  Yes, the "Pulse" (not to be confused with "Pulse Width") measure was introduced with STC3 of OR including CompactDAQ and X series devices.

  Measuring the pulse:

  

  However, you should always be able to measure the frequency and the duty cycle on your card with a half measure:

  The half measure:

  

  The images are in the X Series user manual.

  The difference between these two modes boils down to how the data is stored and implemented in buffer on the map - with the period semi method that the material does not distinguish between high and low samples and puts everything in a single buffer.  However, if you start the meter on the song (see below the node property), then you would know the order of low and high samples in software, and are easy enough to calculate cycle frequency and the duty of this.

  

  Best regards

• Satellite 1800-814: how to measure the temperature of the processor?

  I replaced the radiator component on my laptop as it freezes suddenly during the operation. Now everything seems to be better, but still a last question. How to measure the temperature of the processor?

  Dominic displays only HDD temp and MBM profile for 1800-224 display cases and the cpu. But if I can use this profile? Any other ideas how to meausre CPU temp?

  MBM shows me around 40 to 49 ° C for the cpu. Is this normal or too high just to run windows?

  Thanks in advance

  Greetings
  Jens Grieger

  Hello

  See this http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=5564&messageID=19417

  Maybe the help!

• With the help of the meter from 6525 to measure the frequency: is there a more orderly way?

  I am currently using the high speed on a module USB 6525 meter to measure the frequency of an object in rotation via a sensor hall-effect.

  I was wondering if there was a simpler way / more effective this encoding than that?

  Everything that I currently perform the current meter reading, wait a second, take another reading, and subtract one from the other. The result is the frequency in hertz.

  Is there a way to get the 6525 to return the number / change County after 1 second?

  Thank you

  

  On the 6525, you have a country of the event and you can't make a measure of frequency.

• I want to maintain the "frequency of sampling to report signal frequency" a constant.

  I want to generate sine waves of varying frequencies, say, from 1 Hz to 1 kHz. Sometimes, a swept frequency sine wave. The problem is that I want to maintain the "frequency of sampling to report signal frequency" a constant. That means, the sampling frequency must be 20 or 30 times the frequency of the signal. This should be done automatically. For example, a sweep of 1-10 Hz, if the sampling frequency is 30 Hz at the beginning, it should be automatically updated at 300 Hz as the frequency of the signal reaches 100 Hz. Someone you will suggest a possible solution?

  The basic generating function function has an entry titled "sampling info". It is a cluster and one of the elements is the number of samples. You just need to set this based on your frequency.

  

  I suggest strongly that follow you the course 101 of LabVIEW.

• How to find the frequency in the cureent network band to blackberry.

  Hello

  How to find the frequency in the cureent network band to blackberry.

  There is no API that exposes this information on a BlackBerry smartphone.

• How to measure the performance of the sql query?

  Hi Experts,
  
  How to measure the cost of performance, efficiency and CPU of an sql query?
  
  What are all the measures available to a sql query?
  
  How to identify the optimal query writing?
  
  I use Oracle 9i...
  
  It'll be useful for me to write the effective query...
  
  Thanks and greetings

  PSRAM wrote:
  Could you tell me how to activate the PLUSTRACE role?

  First put on when you do a search on PLUSTRACE: http://forums.oracle.com/forums/search.jspa?threadID=&q=plustrace&objID=f75&dateRange=all&numResults=15&rankBy=10001

  Kind regards
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• How to measure the time elapsed between two steps?

  Hello

  In my script, I ask the subsequences. How can I measure the time it takes each subsequence?

  Something like:

  Statement: StationGlobals.TimeElapsed = 0

  -> SOMETHING HERE TO START A COUNTER<>

  call sous-suite

  Popup: Str (TimeElapsed)

  Thanks for help

  StationGlobals.Time = Seconds()

  ... / / stuff in time

  StationGlobals.Time = Seconds() - StationGlobals.Time

  You can also view the sample report of basic step in 2012 TestStand time (you can now download an eval).

• input analog trigger on the door of the meter to measure the frequency of generation

  Hello

  I want to measure a frequency on the analog input, but it doesn't seem to work.

  I'm trying to work with DAQmx with the use of the ansi c standard.

  The first step, I've done was acquiring information on the analog input. With the use of a simulated device, it shows a sine wave on the entry.

  My next step is to generate a trigger for the meter signal, but this doesn't seem to work.

  I don't see how it is possible to connect the trigger on the entrance to the analog meter.

  For the creation of the analog input and relaxation, I use the following code:

  DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
  DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-3.0,3.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",10000.0,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,1000));

  DAQmxErrChk (DAQmxCfgAnlgEdgeStartTrig (taskHandle, "Dev1/ai0 ', DAQmx_Val_RisingSlope, 0 '"));

  For the creation of the meter, I use the following code:

  DAQmxErrChk (DAQmxCreateCIFreqChan (taskHandle1, "Dev1/ctr1", "", 1 January 2000, DAQmx_Val_Hz, DAQmx_Val_Rising, DAQmx_Val_LowFreq1Ctr, 1, 4, "");)

  I hope someone could give me a hint.

  I also tried the examples that come with DAQmx but well I know this are only examples to counter with the help of the digital inputs.

  Thanks in advance.

  Hello

  You must use the exit event of comparison at the entrance of the meter. Change this property after the configuration string function.

  DAQmxSetChanAttribute (taskHandle1, "", DAQmx_CI_Freq_Term, Dev1/AnalogComparisonEvent);

  Kind regards

  Bottom

• How to change the frequency of tracks in multitrack session?

  Hello!

  I have a question and hope you can help me!

  I created a session of multtrack with 2 tracks. How can I change the frequency of them? I mean each track has a frequency of differrent and I use hearing CS6.

  Please help me!

  Thank you very much!

  If by frequency you mean sampling frequency so you can edit the audio file by double-clicking on the item in the multitrack and then right click once you are in the edit mode and select 'convert sample type"and you can change to say 48 k say 44.1 k or something else.

  If you mean, by frequency, pitch so you can do this by again taking the clip view editing and in the menu select Effects > time and Pitch > Pitch Shift