Saving a waveform with time precision

I am trying to save a waveform with 3 digits of precision. ex HH:MMS.SSS.

Hello,
Irrespective of the labview version, if you place a waveform graph on your front panel, right click and go to the scale you want, there will be a formatting option available and you can select that and set your time precision to 3 digits.
You can also check out this following knowledge base to read about the Properties of waveform Chart. There is also another link within this knowlege base which talks about how to programmatically autoscale waveform chart and graphs.
Hope that helps. If not, please email back with further questions.
Good luck and have a great day!
Koninika
National Instruments.

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Waveform with time stamps randomly separated

Folks,
I'd like to get your advice on the following task.
A spectrometer takes data at arbitrary, not foreseeable instants. To each new point a time stamp is attached. The data shall be displayed in a waveform graph with the data coordinate on the y-axis, the data points being appropriately spaced with the correct time stamps on the x-axis.
How can I do this? How can I create a waveform with arbitrarily spaced time lag between the points?
Thanks for any hint,
Peter

Hi Ben,
you don't have excuse, it's a nice example.
So I learned something new: how to trick a waveform chart to display values without fixed dt
(Even when it needs some conversion routines when you collect your data in arrays...)
Message Edited by GerdW on 08-23-2007 02:18 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How to get Digital waveform with Time.

Hi
I have 3 channels , each of which have ON/ OFF cycles specified with milliseconds as shown below.
Channel 1       OFF(3000) ON(2000) OFF(1000) ON(500) OFF(4000) ON(300)
                     The number in the bracket is the time in milliseconds for which the channel has to be ON or OFF.
Channel 2      OFF(800) ON(1000) OFF(6000) ON(2000) OFF(5000) ON(400)
Channel 3       OFF(1000) ON(700) OFF(500) ON(800) OFF(400) ON(600)
So i need a digital waveform plot with Y axis showing the highs and lows for the channel and X- Axis showing the time in milliseconds.
All the channels can be plotted in one graph or separate graphs.
I tried plotting with each OFF as False and ON as TRUE and built a boolean array. then converted to digital. but was not able to get the time (X-axis ) correctly. Is there any way to get Time on X axis for the Digital channel.
Thank you .Regards. Hema.

Hi Dennis,
I have done the same way as you suggested.but the sample rate is common to all the channels.( that is each channel is one boolean array column in the 2D boolean array which is fed to the Digital function , but i need separate sample rate for each channel(1-D array).
The Boolean array to digital takes 2D array as input, so i was not able to get different Time on X-axis.
But i found out a solution( very long method) by building time array separately and plotting the waveform without using sample rate.
Now i want to get rid of the '1' and '0' which gets displayed on the digital waveform by default . That is for every high there is number 1 shown and every low number 0 is shown on the graph. Please can I know how to remove this number display.
I saw digital waveform example too, but on all digital waveform, the numbers are shown. Is there any property to be set to disable 1 and zero display.
Thank you.

Error while saving rpd (problen with time dimension)

Hi all.
I have business model that have no errors/warnings during "check consistency" procedure. But when I save rpd i get error:
-->The Physical table '***' which is part of a time dimension, is also used in the logical table 'XXX', which is not part of any time dimension.
Does someone know how to fix this?

go to time dimention -> right click -> check the box: time dimension

How do i change 2 row of array into waveform with delta time and time

Hello,
How do i change 2 row of array into waveform with delta time and time
so the waveform graph will display two waveform,
waveform, not cluster =]
and how to extract 1d array from waveform?

Hi AxE,
Here is an example VI, that do what You asked for.
Both requests.
Hope it Helps...
Attachments:
2D_to_Waveform.vi ‏75 KB

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Note that CourierNewPSMT is not a Windows font, but a type 1 font as I recall. Acrobat it simply trying to substitute what it sees as the closest font to what is contained in the PDF. Sometimes this seems a bit screwy. There were 4 fonts that were a problem when AA 7 came out and some PDFs that did not have embedded fonts displayed with all sorts of varied characters. You may be seeing a similar association of fonts.

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I want to be able to delete a lot of old photos from my computer after backing them up with Time Machine onto an external hard drive. I want to keep all of my old photos permanently on the external hard drive that I use when backing up. If Time Machine deletes old back-ups then eventually it will delete the photos that I want to keep won't it? How can I get around this?

If Time Machine deletes old back-ups then eventually it will delete the photos that I want to keep won't it?
Yes, that's right.
How can I get around this?
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How to control time with great precision

Hello everybody.I know Timer could control time.But it uses thread.sleep(),isn't it.That means it is not guaranteed.So,does anybody know some approach to control time precisely?
thanks in advance!

Hello everybody.I know Timer could control time.But it
uses thread.sleep(),isn't it.That means it is not
guaranteed.What do you mean by "not guaranteed". How can you expect a non-realtime multitasking OS that uses virtual memory (i suppose you are using a system like windows or linux) to guarantee anything? Some systems are better in this regard, but in addition to this you aslo have the garbage collection. Of course there might be ways to implement soemthing more precise in Java , but without a special VM on a special OS there is no guarantee that it will really work imho.

How to display waveforms as double precision versus seconds in a chart?

I need some help with the following:
I am acquiring several waveforms that I display in charts. I would like to have an option to view data only when I press a button; I would like the new data coming in to append dirrectly to the old data displayed. If I do this with a waveform I cannot append to the old waveform displayed because the points coming is have the time information that will create a gap between old wave and new wave. In simple words is like this: when I turn onn a button data is flowing in my charts until I turn off the button; when I turn on the button again after a time t, the data will flow again on the screen but I will have a gap betweeen the old waveand the new wave of data. The gap is equal with t on the X-axis which displays the time elapsed.
Question is how can I do such that when I turn the button again the data starts to flow at the point where I left it and not after time t?
The problem might be saved by getting y from the waveform and displaying it in a chart? How would I set the X-axis to show me "y" (data) versus seconds?
Anybody has some advice and/or example?
Thank you

Its hard to find the space to run wires all the way to the while loop boundary on these sorts of large block diagrams. It is a little easier to read when you use a feedback node. Do not forget to have an empty waveform with the correct dt plugged into the initializer terminal. I don't see anything on the block diagram that would preclude you from using this method.
There is an "Ignore waveform time stamp on x-axes" setting in the chart properties. I have never played with it, perhaps it will do what you wish...
Message Edited by jasonhill on 02-23-2006 03:38 PM
Attachments:
appendarrayfeedbacknode.PNG ‏3 KB

My Mac Book Pro changes the saved home page each time I start Safari. I also get new tabs that randomly open asking to clean up my Apple

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How do I get rid of this? I tried some of the fixes listed but they don't seem to work or I am doing something wrong.
THanks
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You may have installed one or more of the common types of ad-injection malware. Follow the instructions on this Apple Support page to remove it. It's been reported that some variants of the "VSearch" malware block access to the page. If that happens, start in safe mode by holding down the shift key at the startup chime, then try again.
Back up all data before making any changes.
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Digital Output With Timer (Simulation)

Hello everyone, I just learned how to make LabVIEW program a week ago. I try to make a simulation of Digital Output by LabVIEW (my attachment). In this simulation I have a slider as an input (0-10 V), two numeric control (upper limit and bottom limit), a waveform chart that plot those 3 value, and two boolean LED (P0.0 and P0.1) as an indicator. In this simulation you can fill any number (between 0-10) in the numeric control as a limit for your slider input. If the input from a slider exceed those upper and bottom limit then the boolean LED will turn on, P0.0 if exceed upper limit and P0.1 if exceed bottom limit. The problem is I don't know how to make timer for those boolean LED. As example:
1) Make an input from slider,
2) If input (1) exceed the upper limit,P0.0 will turn on for 5 second,then turn of for 10 second,
3) If in that 10 second you change the input back to normal (between upper and bottom limit) then P0.0 will stay turn of until the input from slider exceed the upper limit again,
4)If in that 10 second you didn't change the input (stay exceed the upper limit) then P0.0 will repeat the process (2) until you the input from slider back to normal.
(Same process for input that exceed the bottom limit).
Can you help me to make this timer? Thank You (I'm sorry I made a double post):newbie
Regards
Juventom
Attachments:
Digital Output With Timer.vi ‏16 KB

Hello Juventom,
As I understand it you want to be continuously checking the value of the sliding bar and comparing that to the upper and lower limit controls whilest also chaning the LED booleans to true for 5 seconds then false for 10 seconds if the sliding bar value is outside of the limits.
To do this you would probably be best using a parallel loop design, where you have 3 while loops in place of the one you have currently. Each one of these while loops would be responsible for a part of your program (e.g. the top one would display your values on the graph and the second one who check the sliding bar value against the upper limit and then turn on the LED, etc)
I've found this tutorial about multiple loop programs and I think you should look at the section entitled "Parallel Execution"
http://zone.ni.com/devzone/cda/tut/p/id/3749
This way you can use normal delay VIs but when they run they only pause that loop rather than the whole program.
Please let me know how you get on with this, and ask me if you need further help.
James W
Controls Systems Engineer
STFC

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I had nothing but nightmares with my LaCie 500GB drive and Time Machine. I had it partitioned, and I could never go back to previous backups to restore a file. After finally reformatting the drive back to a singe partition, I got it to work. But then a month later the drive gave out and I almost lost 250GB or my media. DIskWarrior saved that catastrophe. I ended up getting the drive repaired. LaCie would not replace it, even though it was only 3 months old. Other people with LaCie drives have had issues with Time Machine also. I went back to using SuperDuper and doing scheduled backups with a new Beyond Micro drive I purchased. I don't trust this Lacie drive anymore for backups, especially it's partitioned.
-Bmer
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Can't migrate from 10.8 to 10.9 with Time Machine

My old 2009 MacBookPro stopped working and I replaced it with the new one and hoped to be able to use the Migration Assistant to recover my backed up data I had in Time Machine. So far it jsut keeps "Looking for other sources" when I choose to migrate from Time Machine. I was told I should be able to do this going to the new system and I've done it with out any issues in the past. Is there anything I can do to get this working?

I'm having the same issue with trying to restore a Time Machine backup of a Mavericks machine saved to my Airport Time Capsule to a newly re-installed Macbook Pro running Mavericks. Anyone have any other suggestions?
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Message was edited by: alfredbeta

Is it possible to display a waveform with fixed length and fixed starting point?

Hi,
I am using DAQ assitant to acquire voltage and current measurment of my device. The voltage is a pure sine wave and current is a periodic waveform with phase difference and distortion. I use waveform chart to display the waveform of voltage and current waveform in seperate charts and they work fine.But the waveforms look like moving to the right all the time, in another way ,the phase is always shifting. Now i want to display the waveforms of both with fixed length (say 2 cycle) and also in a same chart. Apart from that, i also want to display the voltage waveform starting form 0 degree (a fixed point )rather than moving all the time. In this case, i can observe the angle difference between voltage and current. Is there any method to achieve this purpose?
Many Thanks,
Hao

Hao,
first of all, you are using a chart which has three options for updates if the chart is "full":
Strip chart (default)
Scope chart
Sweep chart
These are called "update mode". Test the modes yourself.
Also you have to know that you will not likely have an integer number of periods of your signal in the display of the chart. Therefore, a continuous signal will "move" the graph from update to update.
You can implement some algorithm to discard data to maintain a static "trigger" level for display, but as stated, it will leave gaps in the signal. These gaps are not a concern unless you use the displayed signal for analysis (e.g. FFT).
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Saving a waveform with time precision

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