overflow Keithley// GPIB Problem ?

[bibo702]

Hello ,

I am working on a Relay-test  program the hardware is composed from the Keithley to take the mesearment and a Pickering card to match all the pins with the Realy matrix  .

My problem is when the keithley is on , i get the error message "Overflow MΩ" and the program cant find the pickering card .

When the Keithley is off the program can find the Pickering card but of course i can t take the meserments from the Matrix . 

I started to debug the prorgamm and i have noticed that i have different values in both situations . As a beginner i couldnt find the reson of this conflict . 

i screen shoted where i have  found different  values

any help is welcome! 

Thanks \

[crossrulz]

What model of Keithley instrument are you using?  What Pickering card?  How are you communicating with the Pickering card?  If over GPIB, are the addresses for the instruments different?

[Dennis_Knutson]

Duplicate - http://forums.ni.com/t5/LabVIEW/overflow-Keithley/m-p/3238727

[bibo702]

I am using keithley 2400 and the model of the pickering card is 40-535-021. For the keithley i am using a pci-gpib connection. The communication with pickering card happens through visa and driect IO .