
Stony BrookUpdate SB Crew Oct 9, 2007
Quick Update • The 1471 Lecroy module we were using seems to have gone bad somehow. • the mainframe can’t recognize that it’s plugged in. • Bob brought over 2 more, they seem to work fine • module has been modified with Greg’s trip circuit. • WN3 finished stability test with flying colors. • Also took gain vs voltage curve, it’s exponential. • Unfortunately, upon install, mid gem developed a short. • ~50 GOhm • let WN3 mid cook??? • New stack in gain test box... • individual tests: GOOD • draws 50-100 nA when through chain. • Gain is low by factor of ~3 • Gain does not rise with time like usual. Very stable, constant. • could this be due to H2O in gems? Never pumped vacuum on these gems…