2 signals in graph

[stekkie]

I am a noob right now in labview, but am trying several days now to accomplish this: to have 2 of more signals into one waveform. I attached my Vi so you can see what i'm doing wrong. I started from a tutorial that showed me one signal, i copied that and paste it one time so i could see 2 signals in one waveform. Unfortunatly this doesn't work, probebly some stupid mistake but i can't find it... sorry for the bad english 🙂

[MikeS81]

Hi stekkie,

it looks like you use in both tasks the same channel. You can create only one task per device and I/O type. So if you want to read two voltages create both channels on the same task. Therefore you can select all channel in the "Physical Channel" Control.

Mike

[stekkie]

thank you very much! it's works finally! I didn't know you could just write the signals in the physical channel box.

an other problem i have is that excel is to 'small' to load all the data we want, after 65536 cell's excel stops but we have more data, is there anyone who has this same problem and knows how to fix this?

thx

[MikeS81]

Hi stekkie,

why do you need it in excel? You could write your data into a binaray (using "Write to Spreadsheet File") or tdms file.

Mike

[stekkie]

we write our data to a 'tdm' or 'tdms' file and open it then in Excel to make graphics in Excel. I found a tool on the NI website that converts the tdm files into excel, otherwise i can't do anything with my data when it's in a tdm file only, there's no program thats supports that extension? or is it?

Our purpose is: doing measurments over hours or days, look at our data and then make graphics, with these data we can calculate other signals. eg: measure voltage and current into our labview card and then calculate the Power, energie, effectivity, ...

[MikeS81]

Hi stekkie,

you can use Diadem to work on and with tdm and tdms files. See this link: http://www.ni.com/diadem

Mike

[stekkie]

Thank you Mike! i'm wondering why they don't implement this program right into LabView when you buy it?

Tonight i've saved data at 10.000 samples per second, after 16 hours i had a 55Gb file, but diadem didn't open it 🙂 It was a test to see how much information it could calculate and save. I'm very happy that you helped me, if i can help you to i'll do so 🙂

[MikeS81]

Hi stekkie,

nice to here that i could help you . I´m not sure but i think there is a way to open such big files with Diadem, but i think thats another thread.

Mike

[stekkie]

Hello Mike, i'm trying to contact you true the forum but it's not possible to send you a private message, so i contact you true this post. I have a little problem about digital outputs, maybe you can check it out and help me... i'm desperate...

http://forums.ni.com/ni/board/message?board.id=70&message.id=8689#M8689