Time elapsed between each iteration

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• How to set the time difference between each data when using keithley 2400 scanning

  Hello friends,

  I use scanning Keithley vi the extent of SCANNING and acquire vi. I want to measure the voltage for each step and a pause between each two data, so I need a delay between each I step.

  I'm a starter to use Labview, thank you very much for your answers.

  Perry

  As Dennis says, if you use the built-in scan function, you will need to consult the manual. See Section 10-16 (this is page 10 of article 16, only paragraphs not but 10, 16) for the manual Keithley 2400.

  The Keithley 24xx series has a speed of measurement in units called PLC (Power Line Cycles). The default speed is 1PLC, which means a measure is taken with each cycle of line 1 power supply or 1/60th of a second (16.67ms). 24XX can range from 0.01 PLC (all 0.16ms) 10 PLC (all 166.6ms). The faster you measure, the less accuracy you get.

  To programmatically set this value, the command is

  ENSe:CURRent:NPLCycles

  ENSe:VOLTage:NPLCycles

  Depending on what you are sensing and where is the number of controllers from 0.01 to 10.

  Another factor that will determine the time between data points is the cycle SDM. These are more complicated, look at your Keithley manual for more information. Look at article 6 and article 11 for more information.

  Note:

  PLC times are based on a cycle of 60 Hz US.

• 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).

• Time elapsed between 2 points

  Hello

  I'm trying to measure the time between 2 datapoints.
  During the data acquisition begins the time must be saved and when the signal reaches 90% of it is max.
  These 2 times then extracts itself and then you have the elapsed time.
  But I'm not sure how to proceed... I thought with dishes sequences.

  You capture a signal at all times?  What is your sampling rate?

  What you need to do first to get the signal.  You can find the maximum value with Array Max & Min function.  Calculate your 90% (0.9 * Max).  Search the data until your get the 90% or greater.  Download this issue of sampling.  Your time is so number of samples at the helm of the 90% divided by the sampling rate (samples per second).

• How can I measure the time between each two successive increase edges, using digital input?

  Hello

  I have tried two measure the time in seconds between each two successive rising edges on a digital input.

  So far I managed to detect the rising edge, increment a counter at each rising edge and take the time during which the increase is edge

  all I need now is subtract edge currently rising from the previous era of edge rising to calculate (T), which can be 1/frequency and display in real time for the user.

  but I do not know how to do this

  Can someone help me please!

  Woah!

  Sorry Apok, but your code becomes much too complicated and salty. I don't think that all records to offset or Boolean conversion/operators are necessary at all.

  If you want to measure the time between two keys so it's another (much less complicated) way. It simply records the time when press button in a registry change, then compares the two.

• change the time between each photo in movie maker vista

  I am doing a slideshow using vista movie maker. I added music and it is great. BUT I can't change the length of time between each picture and the duration of transitions. I tried tools / options / and I can change out there, but it does not apply to my project. I also tried to do it manually but still no luck.

  Any help would be most appreciated.

  Maybe the following will help:

  The change of setting to: Tools / Options /.
  Advanced... tab applies only to the added photos
  to the timeline * after * you change the setting.

  If you switch to view "Storyboard" and select
  all the pictures in the form of batches (select one and the type...
  CTRL + A)... you can add the 'Speed Up, Double.
  or "Slow down, half" effect of changing the
  duration. Simply select all clips / right click
  the effect on the menu... Choose...
  Add to storyboard table.

  'Speed Up, Double' cuts the duration of half.

  "Slow Down, half ' double life.

  These effects can be added up to six times.

  If you need finer adjustment...
  the info may be useful:

  To the timeline, you can change the
  the duration for each picture manually. Drag the
  Garnish handle left or right to increase or
  reduce the duration. You can see a
  Tip displaying the change.

  Or... just to redo the project after changing
  the long-term: Tools / Options / Advanced
  tab.

  With respect to Transitions, see the following article:

  Windows Movie Maker Vista - add transitions and effects to pictures and
  video in Windows Movie Maker
  http://Windows.Microsoft.com/en-us/Windows-Vista/add-transitions-and-effects-to-pictures-and-video-in-Windows-Movie-Maker

  In some cases, you can add a transition
  to every other picture... What follows... explains why:

  This happens when the Transition is
  the same or greater than the length of the photo.
  This setting must be entered before add
  clips on the timeline.

  Tools / Options / Advanced tab.

  To add effects or Transitions to all clips
  at the same time... Follow the following steps:

  Go to the table of Storyboard view.

  Select all images. (click left one)
  and type... CTRL + A).

  With all the images selected... go...
  Transitions video and do a right click the
  You want to add, and then click on...
  Add to storyboard or type table... CTRL + D.

  It also works with the effects.

  Effects...

  The duration of the effects is not adjustable. As a work around
  to extend a fade in from black, you can insert a black solid
  .jpg that you can create in most image editing software.

  (FWIW... the intensity of certain effects can be increased
  If you right click on the picture and choose... Video effects...
  You can add up to 6 cases of effect)

  In Windows Paint (for example)... Open the photo / right click
  the black square in the color box and type... CTRL + SHIFT + N.
  (if you do not see color box... type... CTRL + L)

  (1) to save a photo...
  (2) go to... File / save as...
  (3) select a backup location...
  (4) enter a new name (which guarantees that your original picture is
  not overwritten),
  (5) choose a format...
  (6) left click... Record.

• Timer elapsed time in seconds

  Hello

  I want to continually update the timer indicator up every second.  I don't understand why the program does not work?  Can offer you assistance to help me display timed time (in seconds).

  Thank you

  hiNi.

  PS, I know that there is a timer express VI passed, but I would like to know how to display the time elapsed without the express VI. Thank you!

  Why every second?  With each iteration of the loop?

  Since your loop runs every 100ms, you might make a counter using another register shift.  When the counter reaches 10, download your timed.

  Try these screws to see if they do what you want.

• Switch time delay between 3 and back!

  Hello

  I'm trying to figure out how can I switch between three cases in a case structure for a while between each switch.

  For example: I have three cases in a structure of case (case) {0,1,2} where zero is the default case.

  What I want to do is to start in the case of the value by default 0 wait 1 s switch for case 1, wait 1 second switch case 2, wait 1 second back switch for case 1, wait 1 second back to the 0.  Then repeat the order.

  I used the timer elapsed value of the ramp function Tim from a selection function between true and false, but with the additional case I don't think that this approach works.

  Any ideas?

  Search for the term "State Machine". That's what you're trying to invent (nice work) so feel free to 'Cheat' and look for the wheel as it exists today.

  Ben

• Measure the time in seconds each time run you a VI

  Dear people,

  I'm trying to measure the speed of a wheel using a magnetic sensor and other settings in the vehicle. What I also need to document in my project is the time elapsed (in seconds) each time that you run the program. Is there a way where you can measure the elapsed time in seconds in labview?

  Any sort of suggestions or examples would be useful.

  Below is an example of how I wanted my final to watch output file.

  Time (sec) | Speed (mph). Acceleration |

  0                    23                 5

  1                    24                 6

  2                    25                 7

  Thank you in advance!

  Rahul-

  Hi iZACHdx,

  That's what I was looking for exactly! Thanks for the simple example.

  Thank you

  Piraux

• A generated within a loop in a subvi output data can be transferred to the main program for each iteration of the loop?

  Hi LV users,.

  I have a very basic question, I have not succeeded to asnwer using basic considerations.

  I made a sub - vi that performs a scan of current-voltage using a unit of measurement-source Keithley and a loop FOR.

  The subvi outputs 2 tables with my data (essentially an array of voltage and the corresponding current table). I also defined a Terminal at the exit of a group of these 2 tables in order to plot a graph XY - output. Specifically, I indexed this cluster to update after each iteration of the loop FOR, in my sub - vi (the indicator is placed outside the loop, of course).

  My problem is that I want my main program to display the XY-graph in real time, with an update after each iteration of the loop FOR which is in my sub - vi.

  I have a problem because my sub - vi output terminals are available for the main program concluded as soon as the sub - vi has completed its own execution (which is what we expect of sub - vi to do).

  How can I use a sub - vi (because it's handy) and get in the main program in the course of its performance data that are generated from the loops of sub - vi?

  Thanks in advance for your help,

  Yoyo87

  Elements of the queue in the Subvi them put your main VI where you want to display the data and the.

  It is similar to the architecture of producer/consumer. There are examples of it in LabVIEW. The examples work with 2 parallel loops, in your case a loop (the producer) will be in the Subvi.

• Start and stop a loop automatically subtracted at each iteration

  Hello

  I know that there are some topics about this, but I couldn't find any solution, especially because I'm using version 7.1 and cannot open files from new version.

  My problem is the following:

  I need to load a tank of 6 to 10 in the morning, every day for 3 days. The process should start and stop automatically, which means, no funds to start or stop. Start and stop conditions come from time.

  I start with a big loop of 72 iterations, which is 72 hours.

  The tank must start at level 6, whenever he starts.

  After the departure, 1 unit must be subtracted to each iteration. That means, that the tank is level 10, at 06:00 07:00 level 9 and so on. At the end of the day, at 10:00 the fill level is equal to 2.

  The next day, the process must start again and the tank must start at level 6.

  Any suggestions? Thanks in advance.

  Hi Florian.

  Thank you for your message. That solved this problem, but in fact my VI did not work as I wanted.

  I created a new one, with and an external file from 1 to 24, repeat 3 times. Now I got it. Maybe there is a better way to do it, but it works now. Thanks for all the help. I appreciate a lot.

• Writing a single line of numbers in a text file or write several lines each iteration?

  Hello

  I am currently working on an application that has a few different time-loops at the same time. A single loop acquires data (DAQloop), another shows the data (raw and processed data) on graphs (Graphsloop) and another stores data in an open (Storageloop) ascii text file.

  The data is passed to the DAQloop to the Storageloop through a queue. Now, I leave the Storageloop take the first element of the queue (oldest) to store in the text file each iteration. However, I was wondering if it would be better to let the Storageloop take all items currently available in the queue store at once.

  Does anyone have ideas on this? Who better its? The text file is already open and is simply passed as a refnum.

  THX!

  With normal file primitives LabVIEW, you will get your best speed of disc when you write about 65 000 bytes of disk at once (or read, incidentally).  When I write a similar code, I included a string buffer in the loop of Scripture.  Whenever I get data to write, I add it to the chain.  When the chain hits 65 000 bytes, I write to disk.  You could break this into three loops, as well - a read buffer, and write.  Depending on the current size of piece, you could see a change in the order of magnitude of the speed of disk write.  This write operation is often limited by the conversion from binary to ASCII, not the disk i/o.  If you do this, be careful with your buffer.  You can get some serious slowdowns depending on how you implement it.  This post has some details and examples.

• NEAT SQL - time scale between two records to find...

  Hello everyone, first of all please let me apologize because it's a fundamental issue, however my sql is nowhere near as good as my design skills and I'm having a headache with something...
  
  In simple terms, I have a table which we will call "TBL_MOVEMENTS".
  
  In this table, we record the time several doors open and close. So we have the passes "DT" (Datetime in timestamp), 'DOORID' and 'STATE '.
  
  For the sake of examples, we will say that we want to select the hours each door was open for. (actually every door will open and close hundreds of times)
  
  The data in the table would present a little as follows...
  
  DT DOORID STATE
  ----------------------------------------------------------------------------------------
  2010-01-15 09:00:01.223 OPEN A3
  2010-01-15 09:02:04.789 OPEN A1
  2010-01-15 09:07:55.123 NARROW A3
  2010-01-15 09:08:12.654 NARROW A1
  
  
  In English the logic I would attempt in the direction of
  
  Select the doorid and the timedifference between each open event and the very next event close to the same door.
  
  If anyone can help I would be very grateful!

  Hi and welcome to the forum!

  You are looking for something like this?

  SQL> WITH door_events AS
    2  (
    3          SELECT TO_TIMESTAMP('2010-01-15 09:00:01.223','YYYY-MM-DD HH24:MI:SS.FF3') AS DT, 'A3' AS DOORID, 'OPEN' AS STATE FROM DUAL UNION ALL
    4          SELECT TO_TIMESTAMP('2010-01-15 09:02:04.789','YYYY-MM-DD HH24:MI:SS.FF3') AS DT, 'A1' AS DOORID, 'OPEN' AS STATE FROM DUAL UNION ALL
    5          SELECT TO_TIMESTAMP('2010-01-15 09:07:55.123','YYYY-MM-DD HH24:MI:SS.FF3') AS DT, 'A3' AS DOORID, 'CLOSE' AS STATE FROM DUAL UNION ALL
    6          SELECT TO_TIMESTAMP('2010-01-15 09:08:12.654','YYYY-MM-DD HH24:MI:SS.FF3') AS DT, 'A1' AS DOORID, 'CLOSE' AS STATE FROM DUAL
    7  )
    8  SELECT  DOORID
    9  ,       DT              AS DT_OPENED
   10  ,       DT_CLOSED
   11  ,       DT_CLOSED - DT  AS DURATION
   12  FROM
   13  (
   14          SELECT  DOORID
   15          ,       DT
   16          ,       LEAD(DT) OVER (PARTITION BY DOORID ORDER BY DT) AS DT_CLOSED
   17          FROM    DOOR_EVENTS
   18  )
   19  WHERE   DT_CLOSED IS NOT NULL
   20  ORDER BY 1
   21
  SQL> /
  
  DO DT_OPENED                      DT_CLOSED                      DURATION
  -- ------------------------------ ------------------------------ ------------------------------
  A1 2010-01-15 09:02:04.789        2010-01-15 09:08:12.654        +000000000 00:06:07.865000000
  A3 2010-01-15 09:00:01.223        2010-01-15 09:07:55.123        +000000000 00:07:53.900000000
  

  Published by: Centinul on January 15, 2010 14:46

  The minor error.

• Work with each iteration on my db

  Hi my process should work with each iteration on my database, so I write some time initially, but now IM hinking t that it won't work. If I need that my process with al my data I need to do?
  
  Thank you

  I do not have you problem entirely. Can you explain a little more

  Thank you
  Brijesh Kumar Singh

• How to reset the counter at each iteration, and how to introduce a delay

  Hello world

  First of all I apologize for the basic level of my questions, I'm new with Labview...

  I'm counties of reading out of a USB-6008 labview chip using the DAQ assistant and I write the output to a file. The problem is that instead of giving me the number of levels for each iteration it gives me the sum of all this. How to make Wizard Reset to 0 data acquisition account on each iteration? I tried using a shift register, but it added a counter to my folder and nothing else...

  Thank you very much

  Sure thing. Sorry about that.