HEM Data's DAWN is both PC-based scantool and a data logger. Users can set limits to monitor and have the logger alert them automatically to a problem. Ideal for catching intermittent problems. DAWN overcomes the limitation of service scan tools that have limited display and storage capabilities, limited sample rate and typically acquire data from one controller at a time. DAWN has the ability to acquire both OBD and Enhanced Vehicle Diagnostics, thus providing users with several hundreds of parameters to choose from and a wide range of flexibility to display the data - including Y-T and X-Y plots, digital and dial meters, histogram, and indicators. Beyond combining the best features of a data acquisition system and a scan tool, DAWN also acquires parameters at high sample rates - up to controllers’ maximum rate of 250 samples/sec.