... for five seconds to stop the unitDecripiton for the exam process:While the pump is in the absence ... second to twelfth time in every 30 minis, and exam time will last 50 seconds, and the unit will ... thirteenth to forty-seventh time in every 60 mins, exam tim will last 50 seconds, the unit will stop ... in the forty-eighth exam, During the exam process, it lasts 41 hours. SKD-5B automatic ...