Dear Isogeochemists I am using MAT 253 with ISODAT 2.0. My left bellow is misbehaving since I did the bellow calibration (hardware). It is showing bellow value of 100% and pressure of ~100 mbar, where my guess values from signal intensity are ~30 % and 50 mbar, respectively. The program completely hang up when I was trying to move the bellow (by a mouse or by typing in a number). I am afraid if it's really a hardware problem. Any inputs will be appreciated. Shuhei -- Shuhei Ono Geophysical Laboratory Carnegie Institution of Washington 5251 Broad Branch Rd., NW Washington, DC 20015 tell) 202-478-8988 Fax) 202-478-8901 On Jun 30, 2005, at 4:14 AM, Street-Perrott F.A. wrote: