Hello!
Are you using an NI GPIB card or an Agilent GPIB card to communicate with the GPIB-VXI card in the HP E1301B chassis? If you are using an NI GPIB card, then please use the information located in KB 1V2CK572.
Link to KB 1V2CK572: http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/1d7046abe501c36286256897006c0f90?OpenDocument
Instead of using NI-VISA 2.5, I would recommend using NI-VISA 2.6 which installs with LabVIEW 6.1 and is also available for download from www.ni.com.
If you are using an Agilent GPIB card, we recommend installing Agilent VISA version K first. Second install NI-VISA 2.6, which you need to link VISA to LabVIEW. In the Agilent I/O Configuration Utility, change the resources to GPIB1 instead of GPIB0. Final
ly, in MAX, enable the Tulip passport for VISA. In MAX, this is found under Tools -> NI-VISA -> VISA Options -> Passport tab.