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Problem reading GPIB in 2400 swV Linear Stair with DCV -gpib.vi

Hi, I'm trying to execute a simple sweep V, measure I routine for my Keithley 2400 sourcemeter using code from Keithley's website.

 

I can talk to the Keithley ok, and the readout from the Keithley front panel during a sweep makes sense but somehow the data aren't being saved correctly into LabVIEW. e.g. The recorded voltage swings wildly from ~1E10-3 to ~1E10+38. Another symptom is that if I ask for 10 data points, I get 25.

 

Can anyone help?

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Try using the instrument driver instead of making you own, that should help. Try the following link:

 

http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=1583

 

Hope it helps

 

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Wisdom is the principal thing; therefore get wisdom: and with all thy getting get understanding. Proverbs 4:7
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