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I am having some questions about the Labview VI for the Keithley 6517b model.
I want to measure very low currents continously so I build a VI. I use the DCI config VI to put the keithley in current measurement mode and then while-loop over the multi-read vi. The multiread-vi has an input called count-value. What does this input do as it's smallest value is 2 and not 1?
Does it coordinate the number of measurements the keithley takes for one measurement-point? e.g. with having a value of two it takes two measurements and then takes the mean out of them both? It would be nice if you could provide me some info.
Another question I have is if it's possible for the keithley to give me some uncertainty? When the keithley really averages over several measurements then I need the statistical uncertainty for each measurepoint.
As you may see now what I'm looking for is a deeper understanding of how the keithley generates it's measurements.
I attached the VI. #measurements is the input for count-value as mentioned earlier.
I hope you can help me and many thanks in advance.
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I tried three drivers.
6517 for Labview 4
6517 for Labview 6
6517B for Labview 2015
But heres a quick screenshot of the VI's if that helps you.
Thanks for the fast reply
The following link is for the most recent labview driver for the 6517B.
http://sine.ni.com/apps/utf8/niid_web_d ... E2BA35FCF0
But honestly I think that the old drivers work much better.
I've attached a continous readout VI. What bothers me is that its refreshrate is very low. Even if i change the timer in the while-loop to 1ms.
Also can you tell me how the keithley acquires measurements? Where can I get the standard derivation for each measurepoint?
All I am getting from the Read Measurement Data.vi is a cluster with the measurement as a double, units, time stamp & date, reading #, channel #.
But I'd like to see some uncertainty.
Thanks for your help
PS: I've put the VI in my dropbox as I cant attach it to this post for some reason?
https://www.dropbox.com/s/idnvxgwei648b ... er.vi?dl=0
I think that it is internally locked by some scpi command but I dont know how to unlock the keithley.
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