measuring rms between to cursors

[klubicka]

I would like to measure rms value of the signal between 2 cursors.I'm using LabView 8.2.1 on pci6110 How to do that.Please help.

[Christian Mergl]

Hey,

You can use the property Cursor.Postition to read out X and Y of the active Cursor. Or you use the Cursor.List e.g.:

[AHK]

hi,

Use the attached vi.Let me know if you have doubts in this. 

[klubicka]

Thank you, but it das not solved my problem.Problem was not to read position of cursors .I want to measure RMS value of the portion of the signal.Portion is a part of signal between to Y cursors.

[DaVince]

you have to find out the start and the end of the data between the cursors (being an array?). Use the sub-array function to create a sub-array of that and use the Mathematics -> Probability & Statistics -> RMS vi to calculate the RMS.

[AHK]

Hi,

Check out the attached vi and let know do it worked as per your requirment. 

[johnsold]

Be aware that the RMS measurements may give misleading results if the data segment (between the cursors for example) does not contain in integer number of cycles of the signal being measured.

Lynn