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• Find the time delay between two signals

  In this code, I sent you a pulse in the acquisition of data using labview. The pulse triggers a thermistor to another analog input input data.

  I want to find the delay between the time of the positive edge of the switch, and the exact time of the DAQ begins to take in the signal of the temperature probe.

  I enclose the code below.

  Thank you.

  Hey,.

  Here is a link to some information about the sources of clock on the FPGA.

  http://digital.NI.com/public.nsf/allkb/94CE338CC80ACF008625791400516BAA?OpenDocument

  Hope this helps

• Delay between angle and entered analog on a 6221

  Hello

  my test setup consists of a (8184 current run LabVIEW RT) embedded PXI controller which uses a PXI-6221 of data acquisition. One of the outputs analog of the 6221 creates a demand for speed that is sent to a servo controller. the servo drives then the test configuration. Between the servo and the remaining test configuration, a quadrature encoder is located. Both the 6221 meters are used to measure the position of the servo (using the trains of pulses A and B) as well as the speed of the servo (frequency of A pulse train). In addition to these counter inputs, some analog inputs of the 6221 serve as well to recored the configuration of test signals.

  In this configuration, one of the analog signal has a frequency of n periods per revolution of servo (determined by the mechanical design of the test facility). But when I leave the servo turn to for example 100 rpm, then decelerate from status quo with a constant deceleration and then draw the analog signal against the measured angle, I see clearly that as long as the speed is telling, I n periods per turn (or a passage from my analog AC to zero each 1/2n towers); However, as soon as the slowdown begins, the plot gets stretched along the axis of the angle (so the plot tells me there are less than n analog periods per turn, which is impossible because it would require the mechanical destruction of the facility).
  However, I can calculate a position based on speed information signal, as I got to the second counter (by integration of the speed). When I do this for the above velocity profile and draw the analog signal against the calculated angle, I see exactly n times / revolution, no matter how fast the installation program is rotating (just the expected behavior).

  So, apparently, the speed measured is "in phase" with analog signals, while the measured angle has a "phase error. Draw the angles measured and calculated against the time tells me the same thing: the measured angle is always late (compared to the calculated angle). The period is not constant throughout the measurement; I've seen values between 30 and 170 ms within a single record. Due to this change of variable, inserting a delay for all channels, but the angle is not a great idea.

  Unfortunately, calculation of the position of the speed signal is no option for me, because the direction of rotation is changed during measurement; because speed information I have based simply on a frequency of pulse train, it contains no information management, therefore a calculated position would be unaware of the changes of direction.

  Does anyone have an idea whence thios delay and what I can do to fix this problem?
  Try a position different methods of decoding or exchanging the meter channels has not made a difference.

  Thank you!

  Hey Kevin,

  attached you will find the last block diagram (no new translation this time, since no changes have been made that require a), which includes your last suggestions (explicitly start the task of AI, remove the excess constraints) with a flat sequence structure that applies all the preparations of task to finish before the start of the first task (I know I could have achieved the same effect of intelligent routing of the signal error, but I think the code is) better readable this way).

  Without OPI, LabVIEW tends to start to have, ao and tasks of the angle of the very different moments, which (for some reason that I don't understand - we have a sample clock based calendar here, and the sample clock is run, well after the three mentioned tasks...) tends to cause delays in the order of several 10-100 ms between tasks. With the structure, this problem is eliminated.

  The Sub - VI just above DAQmx writing contains the "conduct" code that I used in the last screen shot to "serialize" the requested speeds - in this way, the table that contains the requirements of speed does not need to be rebuilt.

  The code that creates a weather channel frequency implicitly timed measure left the VI shown here in a second VI that is running on the host computer, because everything that involves a calculation and does not require any intzeraction with the DAQ hardware is better placed there (the 850 MHz on the PXI controller celeton is slower than 2 definitiely something host GHz Dual-Core system).

  The behavior you mentioned for the task "not started" HERE is what wrote using LabVIEW. I thought the block of relaxation that I had at the beginning would treat the start of the task - at least, the code like this figure repeatedly in the examples that come with LabVIEW.

  I don't really understand what has caused the problems I've had - it seems that it was the combination of the measure quickly loop iteration with the start of task based on trigger HERE, but I do not understand what are the mechanisms in the background caused the problem (too forced loop was not the cause; the same block diagram works well with an additional loop timer).

  If the solution was composed of the following steps:

  -remove the old code calculating speed, replace it with a better code out of the main loop. This allows to

  -reduce considerably the frequency of the main loop.

  -Pull the DAQmx writing out of the loop, and

  s ' ensure that all tasks are started explicitly just before the main loop starts to run.

  -Possibly remove excess constraints of the main loop.

• Switching between forward and back Web cameras

  I am using Skype, but the PC only accesses the camera back. I need to change between the cameras front and rear for Skype. How can I do this?

  May I ask what phone do you have?

  In the settings of the Skype software, you will find the camera option.
  This option allows you to choose the device that should be used by the Skype app.

• Delay between labview and hp 83620A microwave synthesized Sweeper

  Hello world

  I'm using microwave synthesized Sweeper hp 83620 has to sweep the microwave from one frequency to another.  I control the instrument via GPIB-USB-HS.  I use the device provided by Labview driver. http://sine.NI.com/apps/UTF8/niid_web_display.model_page?p_model_id=782

  My program tells the instrument, the frequency of start and stop as well as the size of frequency step and downtime.  But at some point of time, I want to know the instantaneous frequency that produces the instrument and save it as data, so I built in a virtual meter within the program.  But it seems to me that when I hit the run button, it takes time before the instrument scan.  This makes the frequency meter reading ahead and save the wrong values.

  So nobody knows exactly how long the delay is. It seems that this period is about 1 second, but I need a more precise value have a reliable data acquisition.  I would really appreciate an entry and a suggestion for improving the program.

  Thank you.

  P.S. I have included the image VI below for convenience.

  Tom,

  When you work with LabVIEW, it is important that you understand its paradigm of data flow. This means not only no function, the Subvi or the loop runs until all nodes input receive data. And no loop will return the results to the output until the loop is completed. So in your case, we just need to understand what the function is in your top string actually starts the scan. If it's the call after the outbreak of arms vi branch simply error on the wire from the loop for. (you can't even wire to something else and please note I said branch it) due to the assistant of the instrument you cannot expect perfect results. If you have not run it with execution highlighting turned on (bulb on the block diagram toolbar) Please try it.

• TIME delay start order and time limits

  Hi all:

  I have a question about the vApp properties & gt; Running dialog box. Page 56 on user's guide States:

  "In the tab running, determine the sequence of boot, boot delay and delay of closure order.

  You must type the numbers that are in progress, for example, 0, 25, 1000, to define the sequence. Negative numbers are not allowed. »

  That's all that is mentioned on the functions of startup time. I guess that the progression is from low to high - that is to say that the virtual machine called 0 would begin before the designation of the virtual machine as 25. Is this correct? The first VM in the sequence must be designated 0?

  My next question has to do with the start time text box. Suppose I have put vm1 to the order 1 order of 0 and vm2. If I want to vm2 start 60 seconds after vm1, can I enter start delay in the text box for vm1 or vm2? In other words, start-up time is used to determine how long after that a particular virtual machine is delayed to start after it is determined to be next in sequence, or the delay is used to determine how long after the virtual machine is started before the next sequence be allowed to power on?

  Paul D. Pindell VCP4

  VCD will start VMs in ascending order and then stop in descending order. For example, if you have three virtual computers with 0, 1, 2 boot order, the first to start is 0 then 1, then 2. When you stop the paralytic, the first stop is 2, etc.

  The VM startup time is the duration in seconds of the previous VM starting in the boot order. Using the same example as above, if the delayed start is 60, 180, 120 for 0, 1, 2 virtual machines, the first 60 is IGNORDED!. The virtual machine with the boot order 0 will start immediately, no matter what it has start delay is. Then, VMS with start command 1 will to power to 180 seconds after vm 0 is turned on. The last of them will begin to 120 seconds after that. The key is that the time is compared to the previous VM, not absolute time relative to the beginning of vapp.

  During the shutdown of a paralytic, the stop delay applies after the first VM is stopped. The stop delay on the virtual machine with the highest boot order is ignored. Then, the next highest start VM command stopped n seconds after one is arrested (where n is the stop of the second delay starts more high order VM).

  There is another type of start delay that can be set in the VC that causes the virtual machine to a break in the bios for a loading screen number of milliseconds. This parameter has nothing to do with how VCD starts VMs. As part of VCD, the delay is applied without even say VC to start the VM so that VC setting delay applies after a virtual machine is running and breaks to the bios screen. If you are interested in using the setting in the CR, you can find it in the "Startup Options" tab options dialog box settings VM.

  I hope this helps. Let me know if you have any other questions

  -Boris

• Can you switch from activity between kilojoules and calories

  prefer the use of calories on kilojoule, is there a way to change this to Active

  Hello

  On your watch, open workout app and select this option to start a race in the open air.

  When the goal screen, swipe left / right to the goal of kilojoules. Force press on this screen, then choose calories.

  Output of the training app (go back one screen by pressing Cancel, then press the digital Crown).

  The activity app now shows the calories (and calories will be used also for future training in the application of the workout).

• Delay between master and slave 580 ex IIs

  While exploring the flash wireless with my two 580 ex IIs, I noticed when I jumped in the master test, he pulled a delay into the slave. This test has been run while the captain was not mounted on my camera and the sensor of the slave was headed in the direction of the master flash.  The captain has been on the position 'on', so I wasn't trying to send a 'read' flash Any suggestions?

  If you have tested it by triggering a pop of test on the mask by hand (instead of having the camera trigger it)?  Or are you using a wire/trigger any?

  If the first case, why not put the master on the device and test it?

• HP Officejet Pro 8600 Plus: switch to English to Korean and back again to the Office Pro Plus 8600

  Help!  I need to reset the print margins, but the printer and the computer are in Korean.  I need to change the printer to English to adjust the margins, and then back to Korean.   I can't read Korean.  someone can just tell me the correct icons and number of down arrow that I need to run?  I know that I start with the right arrow on the main screen, then highlight the icon gear/key wrench.  The drop down menu from there a 7 options I don't have an English manual of the owner, and I can find in that online.

  Hi TKDmom,

  I'm glad that solved your problem!

  Think about scoring my post as "Accept as a Solution." If others in the community can find the easier answer as well.

  Best regards!

• Communication delay between touch and keyboard

  I use a Windows 8 for laptop (ASUS) to control a robot.  The robot is controlled by a basic computer CNC program.  When I use the touch screen to respond to guests who shows the program, the robot reacts appropriately.  When I use the keyboard to meet guests, there is a delay in the response of the robot.  What happens in later versions of Windows 7 and Windows 8.   This isn't a programming problem since everything worked properly until we started to use computers with touch screens.  Anyone has any ideas about all parameters, we can change to make the keyboard respond the same as the touch screen?

  Thank you

  Mary

  I tried the boot, but it does not solve the problem.  Our programmer was able to find a workaround for the latest version of the motherboard of robot.  Those who have the older motherboard will just have to live with it.  Most won't even notice the delay, but we do not always like it.  I'll let you know if our programmer numbers on what is causing the delay.

  Thanks for trying to help.

  Mary Stephens

• Real-time communication between PHP and Flex application

  My client wants to replace the buttons 'Refresh' in their Flex/PHP app with updating in real time, so as to data changes, it is pushed to the client.
  
  I came across a few articles which cover this topic, but I'm hard-pressed to find the best approach. Can someone suggest possible solutions?
  
  Any help would be appreciated. Thanks in advance.

  If your server supports K 100 simultaneous connections with push (permanent connection)

  It can be used 100K users simultaneous apps. With polling stations, it can serve more

  100 k because it opens a connection and then it closes once the answer has

  been sent, so until this client polls again it can handle other requests of

  other customers...

  C

• How to calculate average daily time of the Start_Time and End_Time fields

  I am using ORACLE 11 G on Red Hat Linux, I have calculated the average daily time of multiple transactions for each day. The followign is the querry that shows the difference between the fields end_time start_ time and time.

  Select TRIP_LOAD_STARTED AS START_TIME, TRIP_LOAD_ENDED'RE END_TIME.

  ceil ((TRIP_LOAD_EDDT-TRIP_LOAD_STDT) * 1440) "time difference Bw Start and End.
  of GATE2GATE_ACTIVITY_VW
  Where TRIP_LOAD_STARTED > = February 1, 14 '
  AND TRIP_LOAD_ENDED < 3 February 14 '
  ORDER BY TRIP_LOAD_STARTED;

  The querry above gives me the result as follows:

  Start_Time End_Time time Diff bw begins and ends

  1 FEBRUARY 14 FEBRUARY 1, 14 18

  1 FEBRUARY 14 FEBRUARY 1, 14 18

  1 FEBRUARY 14 FEBRUARY 1, 14 18

  1 FEBRUARY 14 FEBRUARY 1, 14 18

  1 FEBRUARY 14 FEBRUARY 1, 14 18

  1 FEBRUARY 14 FEBRUARY 1, 14 18

  1 FEBRUARY 14 FEBRUARY 1, 14 12

  FEBRUARY 2, 14 2 FEBRUARY 14 29

  FEBRUARY 2, 14 2 FEBRUARY 14 29

  FEBRUARY 2, 14 2 FEBRUARY 14 29

  FEBRUARY 2, 14 2 FEBRUARY 14 29

  FEBRUARY 2 FEBRUARY 2, 14 14 19

  FEBRUARY 2 FEBRUARY 2, 14 14 19

  FEBRUARY 2 FEBRUARY 2, 14 14 19

  
  

  It shows two dates for which I want to get the average duration in minutes for each group to date by the start time.

  
  

  I use the following querry that probably gives me the average two days mentioned in where clause
  

  
  

  Select the floor (avg ((TRIP_LOAD_STARTED-TRIP_LOAD_ENDED) * 1440)) 'average of Minutes of time.

  of gate2gate_activity_vw

  Where TRIP_LOAD_STDT > = February 1, 14 '

  AND TRIP_LOAD_STDT < 3 February 14 ';

  Average duration in Minutes

  29

  Can someone help me to a daily average time calculated between start and end.

  Kind regards

  mhamidch

  Is that what you want:

  SELECT trunc (TRIP_LOAD_STARTED), trunc (TRIP_LOAD_ENDED).

  floor (avg (ceil ((TRIP_LOAD_ENDED-TRIP_LOAD_STARTED) * 1440))) Diff

  OF GATE2GATE_ACTIVITY_VW

  WHERE TRIP_LOAD_STARTED > = to_date('01/FEB/2014','dd/MON-YYYY')

  AND TRIP_LOAD_ENDED<>

  Trunc GROUP (TRIP_LOAD_STARTED), trunc (TRIP_LOAD_ENDED)

  Always the example of create table and insert statements to verify the results and use the to_date with date format function.

  Post edited by: Elya

• Resolution of screen changes back back when switch between Yosemite and Fusion 7

  Upgrade to Yosemite on my MacBook Pro has forced me to also upgrade to Fusion 5, who had been very stable and problem free. Unfortunately, I knew a behavior very boring to the resolution of the screen in my virtual session of Windows 7, when I toggle between Yosemite and the virtual partition of Windows 7. Any time that make a screen resolution change and change over on the side of Yosemite, when I return to Windows 7, the resolution returns to the default setting of 2880 X 1800, which requires a magnifying glass to see! Does anyone else know this? I couldn't find a thread discussing this problem, but I know that yosemite is new.

  In addition, since it is clearly a bug, can someone tell me the best way to report it to VMWare? I'm sure they want to know about the bugs, but I don't know the best way to report them. They were very helpful when I discovered how hard this upgrade to Yosemite before checking to see Fusion 5 was consistent (if not) was a mistake on my part - they got me on track, and even if it's a bear to learn how to get a live person on the line with VMWare site Once I did, I finally got a guy who nailed - Kudos to their technical support for this team.

  Glenn

  Hello Glenn

  Try to disable the support of the retina by going to

  1. Virtual Machine menu > settings > display. Uncheck the use full resolution over Retina display.

• (Vista) Is there a PRACTICE way to switch between speakers and analog headset?

  (Vista) Is there a PRACTICE way to switch between speakers and analog headset? Must I ALWAYS return the default setting, depending on which audio output device I want to use?

  We have recently installed Music Maker 16.  Before that, we never had a need for headphones and a microphone.  Now, in trying to use the headphone and microphone - and THEN switch back to speakers - we discover a problem.  Apparently, the only way to do it is to change the audio output device by default EVERY time.

  The dispute with this cannot be more of this.  My son records a beat and singing (with headphone and microphone), and then, play through speakers (so we can all hear), we need to change the default settings.  And back...  There must be a better way!

  Any help would be greatly appreciated.  Please talk layman jargon; I'm not a COMPUTER guru.  Thank you!!!

  Hi AnnieElle,

  You will need to switch between the speakers and the analog device and special value to use as the default device. There is no way to set the device to be used at the same time. You can follow the steps below to switch between the speaker and analog device.

  1. right click on the speaker icon in the taskbar.

  2. click on the playback device.

  3. Select speakers or analog device.

  4. right-click on it and click on set as default device.

  Hope the above information helps.

  Thank you and best regards,

   

  Srinivas R

  Microsoft technical support.

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

• YouTube videos are green for a few seconds when they start, quickly moving and switch between fullscreen and windowed mode

  suddenly, last night something happened with youtube. whenever I run a video on youtube its green for a few seconds, then it goes back to normal. its also green when I fast forward/jump and when I change between full screen and windowed. I linked to a screenshot of how it looks as if I googled this problem I find something else where people get a green screen but no picture at all and that it lasts the entire video.

  I tried updating the drivers for my graphics card. I tried to play on my nvidia card rather than use my intel graphics hd 4600 and still got the same result, but instead to get a green image, it was really dark almost black. I also tried to reinstall flash even downgrade to an earlier version, but nothing does. and the strange thing is that I only have this problem on youtube and only through firefox so I even tried reinstalling firefox, but that did not work either

  I found 2 things of this kind of help.
  the first solution is to disable hardware acceleration, but instead to get a green image for a few seconds, image frozen for the same period of time and then play and she is like when its Green, when I start it up, jump and change to full or windowed.

  the second solution I found in support for mozilla, to change the HTML5 player. But even if this player works great I really like it. for some reason any the break from the drive when I change between full screen and windowed mode and I don't like these pop-up windows get you that its now in full screen and I can press ESC to quit.

  These are just little things, but I would like to return the standard player.
  If anyone knows anything that could help me with this please let me know.

  This is the screenshot:
  http://i1285.Photobucket.com/albums/A584/JimZiii/1_zpsb3d41a08.PNG

  What a little wild speculation?

  YouTube uses a technology that has chopped videos in individual pieces, which is probably video serve more easily, but could create more opportunities for issues when moving in the video. There is an add-on called Center of YouTube that allows you to disable this technology and back to the days of one big file. Might be worth a try.

  • Preload YouTube videos while disabling playback Dash - Lifehacker
  • Center of YouTube - Add - ons for Firefox