Keithley 6485 ID Query failed

[Felix95]

Hey folks,

I have connected several instruments via a Keithley KUSB488B to my computer. The voltage source (Keithley 2410) works fine and there are no correction errors. But I have problems while connecting with the Picoammeter 6485 and also the 6487 (same driver). I get an " ID Query failed" error with error code -1074003951.

But there is somehow a connection. The ammeter makes sound and also changes to remote mode. Only the response doesn't work. Do you guys have a solution or have had the same problem?

Thanks and best regards,

Felix

[cstorey]

Are these newish picoammeters?   How old is the driver?  What does a *IDN? in NI-MAX return as a description? 

I suspect you have either an older driver with newer meters, or updated meter firmware that the driver doesn't yet know how to recognize.  When you do the initialize you can query the instrument ID.  The driver then checks the response string against know responses for that instrument.  (i.e. is the instrument at address 23 really a Picoammeter or an SMU?).  If the response string doesn't match it throughs error -1074003951.  The approach to fix it for any instrument is detailed here - https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000015CkySAE&l=en-CA

Hope that helps.  If you are stuck, post a debug trace of the code inside the init.vi with a probe on the response string.  

Craig