man-d wrote: > After instrument calibration I place it in front of the patch in the > with space and press the instrument button and hold. But no bell after > min. 1 minute. Instrument is in the spot reading position. Hi, that seems strange. You should get a beep within a few seconds of pressing the button. What version of ArgyllCMS ? What platform ? Email me the debug output log.txt from -D3: chartread -D3 charname 2> log.txt Graeme Gill.