Leslie, My delta plus advantage has had similar problems. As far as I have been able to figure out, it is a bug in isodat. If you have the same problem as I did, then you will see that if you try to create a new jump calibration isodat will crash again and again when trying to initiate the jump calibration. The first time I had this problem the only solution was to reinstall isodat. Once I reinstalled isodat I made a complete backup copy of the isodat NT folder. The next times I had this problem (it's happened maybe 4 times in the last year) I tried copying over subfolders from the backup copy until all was well again. By doing this I was able to narrow down which file got corrupted. If you have a backup copy of isodat, then you could try replacing the highlighted files shown here: http://kfleb.asu.edu/corruptjumpcalfiles.jpg The easiest way I found to test the problem was to create a 20 second method in which the instrument jumps at 10 seconds from N2 to CO2. If the problem is solved, it will successfully make the jump. If not, you'd get the same isodat crash. I have a few screen shots showing the error messages associated with the isodat crash. When I get some time I'll document that on our lab website in the hopes that someone at Thermo will take care of it. Of course, if someone knows a fix for this, I'd love to know it too. :-) Last note: there is a new isodat service pack out (version 2.60, dated March 13, 2006) so maybe the folks at Thermo have already fixed the bug in that one (although I don't see anything about it in the release notes). Some other pictures to help see if this is the same problem: Isodat error message during a run: http://kfleb.asu.edu/2005-12-13magjumpcrash.jpg New jump calibration failing: http://kfleb.asu.edu/2005-12-14failedjumpcal.jpg Anthony ------------------------------------------------------ Anthony L. Michaud W. M. Keck Foundation Laboratory for Environmental Biogeochemistry Department of Geological Sciences Arizona State University Tempe, AZ 85287-1404 Web: http://kfleb.asu.edu Tel: 480-727-8033 Fax: 480-965-8102 Mailing address: Anthony Michaud PSF-686 Arizona State University Tempe, AZ 85287-1404 ***Windsurf Everywhere*** ------------------------------------------------------ -----Original Message----- From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Leslie D. Price Sent: Thursday, May 04, 2006 8:12 AM To: [log in to unmask] Subject: [ISOGEOCHEM] Isodat problems Hi all, I just replaced the thermocouple in the EA and when I started up the EA and the isodat aquisition, it would do the standard run (zero run). Problem is when I would load samples to run the autosampler. As soon as I ran the autosampler the isodat program would do half of the first sample (in say a set of 5) and then would give a error window of an error in workspace and jump calibration the EA would finish the one sample but the acquision windo would close down after closing the error window. I will try to copy the exact error and include it with a future post. Could anyone help me with what to do on this? I really appreciate anyones assistance. Les