Connecting Keithley 2100 DMM to computer with LabView

[sjsodergren]

For my project, I need to measure the change in resistance of a resistor as it is heated up. I have a Keithley 2100 connected to my computer via USB and have installed LabView, NI-VISA, and the instrument drivers that I found on another forum. When I try to load the VI to "configure 4 wire resistance measurements"  I receive an error message that says "dependency loaded from new path (3 warnings affects 3 callers). I ignored it and I was able to run the VI to take a resistance measurement. However, should this be a concern? 

Also, if I want to take continuous resistance measurements over a period of time (as the resistor is heated up), is there a way to continuously run measurements, store the data, and display it on a graph? I'm new to LabView and not sure how to do this. 

Thanks!

[nyc_(is_out_of_here)]

http://zone.ni.com/devzone/cda/tut/p/id/7466

[Mark_Ramsdale]

Hi,

I wouldn't worry to much about the new paths, the driver was probably saved in a different location.  I think if you run a mass compile on the driver project it will resolve these issue. ( not 100% sure but I think so).

You can use a while loop to continuously store the results and graph the data to a chart.  You will need to put a "wait" in the loop so you are not taking data at the speed of light.

***  Generally speaking *** , open a file outside the loop, store the results during each loop, then close the file after leaving the loop.

Put a stop button inside the loop so you can stop the operation.

Put a *strip chart* inside the loop so you can write data to the chart each iteration and see the updates.

Perhaps put a numeric control inside the loop and attach it to the wait so you can change the length of time between measurements if you want to. (instead of a constant wait period.

***

You can test your method by using the random number generator in the loop instead of your measurement drivers, divide and conquer eh.

This should get you started.

[Dennis_Knutson]

You don't mention where exactly you got the driver or where you installed it but since it is a warning message and everything works, you can ignore the message.

Everything you want is possible. Start with the basic LabVIEW tutorial.

[sjsodergren]

Thanks for all the responses! I'm going to go thinrough the tutorial first before I get too far into my project and then work on setting up the loop for contious measurements, and hopefully I'll get it to work. Thanks again