APIC timer speed measurement inconsistency

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  Gennady salvation,

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• Want a ramp of output voltage over time and measure input 2 analog USB-6008

  Hello

  I want to produce an analog voltage output signal that increases over time with a certain slope, which I'll send in a potentiostat and at the same time I want to read voltage and current (both are represented by a voltage signal) that I want to open a session and ultimately draw from each other. To do this, I have a DAQ USB-6008 system at my disposal.

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  I found no examples in LabVIEW version 2013, but in 2012, you can find them. In general, you can simply download the version as an assessment and get examples. Since I found the examples in a VM youc an discovered the examples attached to this post.

  Not to mention that most of the examples are restructuring in the new versions of LabVIEW but general subjects are still there.

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• Doubts about time series measures

  Hello
  
  In my case, I have two calendars
  
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  Create or replace procedure fin_cal
  as
  Start
  DECLARE
  date of temp_date;
  date of fisc_date;
  date of temp_fisc_date;
  date of previous_date;
  int pre_year;
  int year_date;
  cursor c1 is select trunc (date_time) of dates1 where time_key > = 20100101 and time_key<= 20120101="" order="" by="" trunc(date_time);="" calculated="" from="" 1st="" jan="" 2010="">
  Start
  Open c1;
  loop
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  When exit c1% notfound;
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  pre_year: = year_date-1;

  If to_char (temp_date, 'dd') = '01' and to_char (temp_date, 'mm') = '01' and then
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  on the other

  Select fis_dat in the previous_date of dates1 where trunc (date_time) = trunc (temp_date)-1;
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  temp_fisc_date: = ";
  end if;
  end loop;
  end;
  end;

  Start
  fin_cal();
  end;

  Kind regards
  Anitha.B

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  Here's what I found so far:

  I declare public variables.

  < fx:Script >
  <! [CDATA]
  import flash.utils.getTimer;
  Import mx.controls.Alert;
  Import mx.events.FlexEvent;
  Import mx.events.ListEvent;
  
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  I start my application in debug mode.

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  ... "hit and stay off of debugging...
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• By train and failing to carry out measures of speed

  Can someone explain to me how the linear speed CI module is supposed to work?  I tried with no successt for a while to use it to take measures to speed by using a meter.  I use a card NI 9411 digital input to accept a signal from a radar system which shows a maximum speed measured as a frequency (which is just working at a rising every 0.176 inches moved).

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  Code:-200431

  Source: DAQmx create channel (CI-linear velocity) .vi:2530001
  Property: CI. MeasType
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  The task name: _unnamedTask<6>

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• A measure of speed high speed with encoder in quadrature and NI 9401 on cDaq

  Greetings,

  We use an encoder in quadrature with 360 pulses/turn on the tracks (track A and B) and no trace of Z to measure motor speed at startup. Data acquisition, we use a NI 9401 in 9178 cDaq chassis and a pc with LabVIEW. The problem is that the start-up period is relatively short (less than 1 second), during which we measure speed as precisely as possible. The speed range is from 0 to 10000 RPM.

  What type of measurement method that you would recommend.

  Here are a few methods that we have already tried:

  -Measure with DAQmx CIFreq--> high frequency with 2 counters: speed measurement, but with a very big mistake (+ 166 RPM).

  -CIFreq DAQmx--> wide range with 2 counters: good speed data but more slow measurement,

  -CICntEdges DAQmx (counting separated the two lanes, speed conversion): very incoherent speed data.

  Thanks in advance for your help.

  Matej

  I would definitely say a 4, the measure of a low freq called option with 1 meter.  (Frankly, I've never been

  fond of this name because it is useful for freqs much higher than what I expect most people think "low freq".)   This

  is the method that I almost * always * use for frequency of counter measures.  It works really well to capture transitional

  variations in speed.

  10000 rpm and 360 cycles/rev, you are looking at a maximum frequency of 60 kHz.  The frequency measurement mode 1 meter

  There will be 80 MHz internal clock by encoder cycle edges, then you will get more than 1000 strokes per measure.  The point

  that means only 1 number of quantization errors, you can expect<>

  Further, you can average overall, say, 10 samples to you give even better accuracy and you could still be a data capture

  rate significantly higher than the probable bandwidth of your mechanical system.  (The average would just clean the jitter and noise and would not

  Hide answer true mechanical characteristics).

  -Kevin P

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  Hello

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  Post edited by: Avilja

  Hello

  Why are you talking about 'problem' and 'solve this problem?
  I see no problem!
  First of all I'm not all 3rd party applications that monitor temperatures. I'm not 100% sure if these applications provide a good values.

  However, as far as I know the laptop was shipped with Vista and not XP and Linux. You do not use a factory settings. It seems that you have set up the laptop with new applications and you should know that all the software installed and running insists on the CPU and other parts.

  BIOS fan table supports different temperature and cooling of the speed measurements. This means that if the temperature rises to a higher level, the cooling module starts and tries to decreases the internal temperature.

  Usually the temperature depends on the use of the laptop. If several processes of the OS are running in the background, that the CPU performance are high, the temperature rises and the fans start to run. There is nothing unusual about it.

  Furthermore, the dust and debris inside the laptop might have a bad influence on the laptop cooling. From time to time, it is advisable to clean the cooling modules.

  Last but not least the laptop must be placed free on table to ensure the circulation of air correctly. Don't forget that there is enough free space around the laptop.

  Finally, I must say that one of my friends has an A100 and the fans run correctly.
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  Good bye

• FPGA: unable to update the timer on fpga through host.

  Hi all

  I worked on FPGA project. It has several loops paralel and works with some sampling time.

  I would like to change the "timing" on a single loop, it is called loop output. I would like to slow down the loop so that the loop will update the output less frequently. (see attachment - red circle)

  I modified the code by changing the timer by the host. (see attachment - blue circle).

  I did several things such as:

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  But it did not work all the time. I checked the value on the host, it is always on the same sampling time, even I write the value of the timer to measure.

  2. I changed the strategy by putting the other control connected directly to the timer (without switch) in the loop so that I can change the value directly. However, there is still no luck. The result is not reliable. It sometimes slows down and many are in the same pace as before.

  3. I even put a case in front of the exit structure so it was only updated after sometimes (all 100 or more loops). It is not always useful. I see the speed varies, but it is not as expected.

  The material is piezo readers/engine. But I want to slow down the speed, does not increase the speed. Thus, it should not be a problem.

  I really appreciate if there are any comments or suggestions.

  Kind regards

  Areku

  Hi all

  After consulting with my supervisor, he advised me to spend on intermediate or new control value first. Then, update the value of the control that is connected to the timer loop with this intermediate control value. It will update the value of the timer loop after loop (when intermediary value received from the host and update control connected to the timer loop). It works fine now.

  I don't know exactly the mechanism labview of drafting or updating the fpga through host value. But, it seems to me, in my case, there was a problem of writing a value to the control that is connected to the loop timer where ran in relatively fast. Well, little control ignore/reject the new value because it is busy to execute the loop in high speed.

  Thanks again for the response to my post, GerdW.

  Kind regards

  Areku

• ReadyBoost Windows 7 Pro 64 bit works only not with the reader flash 32 GB USB high speed...

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  Look for a note from the manufacturer that the flash player is Compatible Windows ReadyBoost. Not all manufacturers of this list on their packaging.

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  Answering your questions

  a. speed for Windows ReadyBoost requirements are at least 2.5 MB per second throughput for random readings of 4 kilobytes (KB) and 1.75 MB per second throughput for 512 k random entries.

  Using memory in your storage device to speed up your computer

  (Article is for Windows 7)

  b. ReadyBoost acts as a cache of HARD disc (hard drive) and is not a replacement for direct system memory. It will not improve processing speed, but will help the launch of faster applications and push background applications that serve much in memory reserved ReadyBoost.

  For more information, please visit the links below

  Turn ReadyBoost on or off for a storage device

  Using memory in your storage device to speed up your computer

  Thank you, and in what concerns:

  Ajay K

  Microsoft Answers Support Engineer

  ---------------------------------------------------------------------------------------------------------

  Visit ourMicrosoft answers feedback Forum and let us know what you think.

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