Hi Graeme, Quato support sent back my instrument saying that "the device was checked on several computers with many calibrations on several days and showed no problems. All the calibrations were ok also when compared with other devices." Obviously they did't use toolcrib to check the issue I reported... Is there a way to compile dispcal and dispread in a way that the initial reset error will be ignored? I badly need to use this instrument to compare results with other instrument/software combination. Thanks Fabrizio Il 09/12/10 13.54, "Graeme Gill" <graeme@xxxxxxxxxxxxx> ha scritto: > Fabrizio Levati wrote: >> I owe you a beer... At least! > > No worries. You can also try sending it a "SD" command, > and yours should return "NaN" rather than the floating > point value. You can use "CE" to clear the error after > the "0PR". > > Graeme Gill. >