No problem, I know for my PLX r-500, when the key is turned on my DMM would read a voltage of 5.0-5.100 volts making your own dbf file that only goes up to 5.000 will lock up the program, so may be helpful to have a DMM handy, the voltage may be higher than 5V.
in addition, the data files are kinda weird, they won't let you add extra rows, like for my EGT sensor, going off memory, its like 0-1800F and 0-3volts, i think its like 3mV per degree's or something, so I cannot create like a 1000 row excel file it just doesn't work for me, I usually use one in the directory like GMBAR which has 1000 rows and divide it out, crazy.