I am having trouble performing pulse calibration on TPR equipment. I used the pulse calibration function indicated by the equipment, however, I can't perform the analysis; a message saying that argon should be the first analysis gas appeared. I already tried changing the gas inlets, but it didn't work (I've also tried modifying the absorber gas and carrier gas in the method). I have no idea how to solve this problem and the manual does not provide details about this. If anyone can help me and have information on this subject I would appreciate it.