To obtain temperature versus time graph

[mantriji@99]

Iam using daq assistant in lab view to measure temperature of thermocouple where iam getting the results in form of amplitude versus time graph instude i want the temperature versus time curve so plzz help me out in finding my desired output

[altenbach]

Please explain the problem better.

• Do you want to change the label of the Y axis from "amplitude" to "temperature"? Have you tried to just rename the axis?
• Do you have a scaling problem converting voltage to temperature?

[Bob_Schor]

Please attach your VI.  It may be something as simple as right-clicking the Chart and changing the X Axis "name" to be "Temperature".  Note that this assumes that the Hardware device you are using reports its values in the appropriate units, such as degrees F or C.  Looking at your code will help us to better understand what you are trying to do, and thus make it clearer how you should go about doing it.

Bob Schor

[esliboat]

Yes the issue is in the conversion to temperature
The scaling can be done simply but the values should be from 0 to 100 degrees but instead I get the values in the thousands(2398.44), which is not out expected output.

It is as shown in the image below, I want to track the temperature changes across time but I am finding it difficult to do so. How do I change it so that I can get temperature against time rather than amplitude against time? Please help!!!

[altenbach]

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@esliboat wrote:

Yes the issue is in the conversion to temperature
The scaling can be done simply but the values should be from 0 to 100 degrees but instead I get the values in the thousands(2398.44), which is not out expected output.

It is as shown in the image below, I want to track the temperature changes across time but I am finding it difficult to do so. How do I change it so that I can get temperature against time rather than amplitude against time? Please help!!!

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This thread is three years old. Are you the same user as the original post?

We cannot debug a picture with express VIs and dynamic data. Most likely all you need to do is some scaling, but based on the very sparse information in your post, we cannot be more specific.

[Bob_Schor]

Thank you for (partly) following my suggestion (in Message 3) to attach your VI.  You didn't, but you did attach a picture of your VI (oh, well).  It shows you have a graph, not a chart, but my suggestion stil applies.

• Right-click your Graph and choose "Properties".
• Click the "Scales" tab.
• At the top, you can see that the "Time (X-Axis)" is selected.
• Click the selector button on the right end and choose "Amplitude (Y-Axis)"
• In the box below (where it says "Amplitude"), replace it with "Temperature".
• To be extra-fancy, you could replace it with "Temperature (°C)".  To get the "degree" symbol, you either need to open "Character Map" and find ° in the table and copy/paste it, or if you have a numeric keypad as part of your keyboard, enter "<Alt>0176".

Any other questions?

Bob Schor

[esliboat]

Then I do not think that it is a simple scaling issue, because it did not work, it still gave me the values in the thousands instead of measuring the temperature from 0 to 100 degrees. From the image, I recorded the temperature at room temperature for 3seconds, but it is not showing the standard room temperature. In fact, the values there are not even in degrees Celsius. Please any thoughts?

[altenbach]

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@esliboat wrote:

Then I do not think that it is a simple scaling issue, because it did not work, it still gave me the values in the thousands instead of measuring the temperature from 0 to 100 degrees. From the image, I recorded the temperature at room temperature for 3seconds, but it is not showing the standard room temperature. In fact, the values there are not even in degrees Celsius. Please any thoughts?

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There is no way we can help you unless you tell us exactly what you are doing:

• What is your temperature sensor (RTD, thermocouple (type?), IC, standalone instrument (ethernet, serial, etc.), etc.)
• How is it connected to your DAQ device?
• Does your hardware contain some signal conditioning (CJ, etc.)
• What primary signal are you measuring? (e.g. voltage, serial string, etc.)?
• How is the express Vi configured?
• Your VI does not have a toplevel loop. Are you using "continuous run" debug mode? Don't!!!!
• This forum is for MyDAQ and MyRIO. What do you have? (one of those or something else?)

Is there anything preventing you from attaching your VI so we can see what's in the wire?

[Bob_Schor]

I think @altenbach has more patience than I have.  This is beginning to look like a "phishing expedition".

At this point, I would like to see the entire LabVIEW Project (assuming you have all of the code contained in a single folder, including the .lvproj file) which you can attach by (a) right-clicking the Project Folder, (b) choosing "Send to:" and "Zipped (compressed) folder", and (c) attaching the resulting .zip file.  Do not use another file compressor (like .rar).

This will answer a lot of questions, the foremost in my mind is "Are you seriously interested in LabVIEW?" which is closely related to "Are you asking a legitimate question about your work?"  It would also deal with @altenbach's query about why this is in a myDAQ/myRIO (Academic) Forum when it seems to be a basic LabVIEW question.

Bob Schor

[esliboat]

Trying to monitor the temperature changes in a sample, for a given period of time.