Graph plot in labview to get time in seconds or minutes in X axis starting from 0.

How can we obtain time starting from 0 seconds or 0 minutes on X axis in a chart and XY graph in labview.When I plot it is showing the system time on X axis.I would prefer the time to start from 0 ( seconds) , rather than system time.Please reply.

I have NI cDAQ 9174 chasis and NI 9211 and NI 9207 for thermocouple (NI 9211) and current (NI 9207).Can I acquire all three data inputs within a single DAQ Assistant express vi.Because I tried to access all 3 in one DAQ Assisstant , but it was not accepting it.So I had to place one DAQ Assisstant for thermocouple readings and another for current.For reference I have attached my labview diagram.
Attachments:
rktr3.vi ‏218 KB

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Please help me get time by seconds duration

Hello dear friends.
I have duration of the procces in seconds in table column, but I need show this duration in regular format like this: 00:00:00.
Examples:
13 (00:00:13)
65(00:01:05)
I know that I can write function, but may be somewere this function exist, or anybody have written this function.
Thanks.

Assuming the format you showed is how it is stored (the HR:MI:SS) in your table as a VARCHAR2 and not DATE, then this code would appear to do what you asked, except it just needs to be put within a function wrapper:
SQL> create table x (secs varchar2(8));
Table created.
SQL> insert into x values ('02:20:05');
1 row created.
SQL> commit;
Commit complete.
select to_number(substr(secs,1,2)) * 60*60 +
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from x;SECONDS
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Message was edited by:
psalms1

Excel time is current, how do I have it start from zero

I am sending time and temp data to excel. I want the time to show elapsed time instead of current time in decimal form. Right now the time displayed is the current seconds that the actual time is when I start the program. How can I get the time to start with zero everytime?
I want it to look like this:
                            0.000    21.233
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Thanks for your help!
Kenny

Will you take a look at this set-up? I am getting the data I want, but the columns and rows are messed up.
0
0.25
0.5
0.75
23.29717
0
0
0
22.92344
0
0
0
23.29717
0
0
0
21.86387
0
0
0
This is what I'm getting can I make it give it to me like:
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Attachments:
elapsedtc1.vi ‏132 KB

Display Data on waveform chart or XY graph over a long period of time

Display Data on waveform chart or XY graph over a long period of time
Can anyone help?
I am acquiring data from an Ni DAQ card with the following parameters - sample rate = 12800, number of samples = 4096. I want to extract order information so as to track changes in the amplitudes of certain frequency harmonics. So I use the sound and vibration toolkit to extract this information as shown in the attached Vi. I will like to plot the resulting amplitudes against real-time starting at the time the Vi was run. I really want the display to show these changes over long periods (eg. days, months and even years).
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I have tried to plot the Y component of the resulting magnitude for a given order on a waveform chart. My choice of the waveform chart is because I also want to display alarm limits (using the mask and limit vi) (I can't have these lines displayed on an XY graph plot). I tried adjusting the scale offset using the property node and setting the offset to current time. However, the display on the X-axis can only show a span of 2 minutes as will be seen when you run the attached vi. I want the time display on the x-axis to be over a period of days, months and even years. Is there a way to set the maximum scale on the x-axis to be say a year or so in future.
I really want the display to be like the one in in the second attachment.
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I will appreciate any help that can be given to me.
Thanks
Attachments:
Real-Time Graph Display.vi ‏170 KB
Sampe screen1.doc ‏37 KB

Long term testing can be tricky- and we'l get into that later. Lets start with the basics that you have wrong.
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For an application like this I would seperate my "collection" and "Evaluation" operations.
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Graph plot with time stamp

Hello All,
In my attached VI I am facing some issues.
My loop rate is 100ms and in chart plot data is not appering as per the x-scale(Time stamp). Values are just plotting in the chart without time. I am trying to implement a graph program that should show values according to time loop rate can be different.
In attached VI I have chart and XY graph both. Please have a look and suggest me the valuable modifications.
Thanks and Regards
Himanshu Goyal | LabVIEW Engineer- Power System Automation
Values that steer us ahead: Passion | Innovation | Ambition | Diligence | Teamwork
It Only gets BETTER!!!
Attachments:
Graph.vi ‏14 KB

Hello Ben,
Thanks for your valuable inputs.
I don't have waveform data from the field, its only RS232 communication and each and every 100 ms interval I am getting only one value from the device. Now in current program I am using the chart function. But the value(Y-Axis) and the time(X-Axis) sync in not proper. To avoid this i am planning to implement this using XY Graph so I develop this sample VI. Here if you browse and observer in the code I have both chart and XY graph, in chart you can see my current implementation. If you run this code for few seconds you will get some difference in Y-Axis and X-Axis values plot time difference.
Now If I am talking about XY graph on X axis I can send my system time with the field value to avoid this chart issue. (I am trying to implement same in XY Graph)
Today I achieve the target by done offset and some chart property settings. Now I am looking for same in XY Graph.
Thanks and Regards
Himanshu Goyal | LabVIEW Engineer- Power System Automation
Values that steer us ahead: Passion | Innovation | Ambition | Diligence | Teamwork
It Only gets BETTER!!!

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I am building a program to plot and take data of a relationship between two voltages. One is voltage is uniquely dependent on the other. So far I have successfully built an XY-Graph to plot the voltages against each other (Voltage1 along the x-axis and Voltage2 along the y-axis). However, the XY-Graph only diplays the point (V1, V2) at the instantaneous time I am looking at it, and does not continuously plot different points as I vary the independent voltage. I need the graph to display all the points that occur as I vary the independent voltage. As of right now, all I see is one little cursor that moves all over the graph as I vary it. My program consists of a While Loop that contains all of the following: two seperate data anolog input functions that take both voltage separately from my board. The the output samples from each 'AI Sample' function are then bundled into one cluster using the 'bundle' function. The cluster output from the 'bundle' function is then wired to a 'build array' function. The 1-D array output from the 'build array' function is then wired to my 'XY-Graph'. How do I get the XY-Graph to plot a point every millisecond or so?

Bundling and then using the Build Array is not correct. Yuo can see the correct method in the help for an XY Graph below. In order to use the normal XY Grpah, you would have two shif registers. One for the X array and one for the Y. Bundle the two arrays and then wire to the graph.
The other way is to use the Express XY Graph. With that, you can just wire your scalars to the X and Y inputs and set the Reset input to false.
Message Edited by Dennis Knutson on 11-12-2007 06:32 PM
Attachments:
XY Graph 1.PNG ‏21 KB
XY Graph 2.PNG ‏6 KB

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Attachments:
chart_start.vi ‏20 KB

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>
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Graph plot in labview to get time in seconds or minutes in X axis starting from 0.

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