Temperature measurements display incorrectly after opening a project.

[Matthew_1987]

Dear All,

I am having some difficulty in setting up LabView SignalExpress version 5.0.0 to display RTD temperature measurements from the NI9217 module and the NI cDAQ-9178.

I have two problems:

1. I cannot set the waveform chart to show the desired time interval; I need to set the time interval displayed on the chart to 30 minutes. This means that before taking 30 minutes of continuous measurement the user would see a fixed grid with fixed time boudaries and the plot moving from the left hand side of the screen to the right hand side of the screen. After thirty minutes of measurements have been taken, the chart would begin to "scroll"  so that the earliest measurements move off the screen and the chart still displays the time interval of 30 minutes.

2. I need the chart to display correctly immediately after the project has been opened; When I open the project and click the 'run' button, the windows are all displayed correctly but the readings are not displayed correctly, the chart only displays one short line to the right of the screen and a very short time interval of less than a second. I can correct this by changing to a Time XY Graph and then back to a waveform chart but need this to display correctly as soon as the software is opened. The incorrect and the corrected chart are shown below:

The chart below is displayed when the software is opened and the run button is clicked. This chart style is incorrect because the temperature line is displayed in the bottom right of the chart and only for a short time interval.

The chart below is closer to the required graph described in point 1 but I cannot set the time interval to stay fixed at 30 minutes, nor can I make the software display the graph like this on opening, I always have to switch to a different chart type and then switch back to a Waveform chart to replace the format above with the format below:

Any help would be appreciated,

Thanks,

Matthew

[Aaron_E]

Hi Matthew,

I will try and help you with your task. Have you used the View >> Layout >> Make Current Project Layout Default. This should ensure that the waveform graph stays in place when you open the project.

Is it within a project that you want to save the graph settings, or do you want them always to be setup as 30mins waveform for all new projects? Just to confirm if you right click on the chart and select update mode, is it a strip chart that you require.

Thanks in advance for your response.

Regards,

[Matthew_1987]

Dear Aaron E.

Thank you for your reply, I used your suggestion (View >> Layout >> Make Current Project Layout Default); the windows all open in the correct locations, it is just the way the readings are displayed on the graph that are the problem as this changes every time I open the project.

I would like to make the settings to be 30 minutes for a specific project, but having it set to 30 minutes for all new projects would also be fine becasue I could then re-create the project from scratch with the 30 minutes setting.

Yes it is a strip chart I require.

Best Regards,

Matthew

[Aaron_E]

Hi Matthew,

We should be able to used this function to save the graph settings as well. I have just tried it on my system and got it to work. the procedure I undertook was:

Open my Signal Express Project

Turn off x-axis auto scale (Right click on graph >> X Scale >>Auto scale)

Enter Properties (Right click on graph >> Properties)

Select the scales tab

Select 'Relative To' under the Timestamp Type.

Set the min as 0 and the max as 1800...Press OK

View >> Layouts >> Make Current Project Layout Default

Save

In this case I used the Relative Timestamp Type but you can use whatever time stamp you wish. When opening up this project after doing this the graph is formatted as required immediately.

Let me know how you get on with this.

Regards,

[Matthew_1987]

Dear Aaron E,

Thanks again for your reply, I now have the scale the way I want; it displays 30 minutes when I open the project.

The only problem is that when I click the run button after opening the project the graph does not plot properly, only a single point is shown on the left hand side, I have displayed this on the screenshot below. The red arrow points to the only point displayed on the waveform chart. This does not change no matter how long I leave the project running.

[Aaron_E]

Hi Matthew, I have attached the Signal Express Project I have been using to get your desired output. Can you try running this and see what response you get.

Also can you let me know what settings you have under the 'Step Setup' tab. The easiest way to do this might be a screenshot. If the attached project doesn't work it will be likely to do with the way you have setup your acquisition.

Hopefully we will get you up and running with this soon.

Regards,