DAQ for HPLC (data form)

[errcricket]

Hi. i currently purchased a NI USB-6210 DAQ to use with HPLC. i used labview eons ago and subsequently failed to retain the majority of what i learned. for those of you familar with the old HPLC method of having the output graphed onto a plotter and then measured by hand...well that was how i was doing it. a bit tough on the eyes.  disregarding guassian distribution, i am only interested in measuring peak height (amplitude). since i am looking at the amplitude as a function of time, i am not sure whether or not i should save the information as a text file and look at it in excel, or save it somehow graphically and use some magical "measure" tool to assess the height.

the hplc program runs for 70 minutes and some of the peaks will be quite small.

so my questions:

1. what do you believe is the best form to save the data in?
2. how do i save the data is said format


i have attached a small vi that i have tested with a battery and a resistance substitution box - so i know it is measuring properly.

i have several more questions, but this is a good start.

thanks in advance.

[CarlaU]

Hi errcricket,

I have been reading your post and I have a a few suggestions for you. There are some great examples in the NI Example Finder that demonstrate using the peak detector VI. Just go to the Help Menu and select Find Examples. Once the Example Finder pops up, you can just do a search on peak. I would look at the Advanced Peak Detector.vi and the Peak Detection and Display.vi.

There are several ways to save the data. I would suggest looking at all the different examples in the Example Finder as well. If you click on the Browse tab, there are several folders to choose from. Double click on the Fundamentals>>File Input and Output. There is a great example called Write to text file that you could definitely use. You can also export the data into a spreadsheet file but I would suggest looking at the TDMS file and the Text file examples first. I hope this helps!