Dave checks the Dallas DS1220Y chip in the Prema 6047 7.5 digit multimeter to see if the battery is dead, and if the calibration constants have been lost.<br />http://datasheets.maximintegrated.com/en/ds/DS1220Y.pdf<br />ROM is here:<br />http://www.eevblog.com/files/Prema6047-ROM-8-5-91.BIN<br />Previous video: https://www.youtube.com/watch?v=G-6BBF3HyRU<br />Forum: http://www.eevblog.com/forum/blog/eevblog-615-prema-6047-multimeter-followup<br />/<br />EEVblog Main Web Site:<br />http://www.eevblog.com<br />EEVblog Amazon Store:<br />http://astore.amazon.com/eevblogstore-20<br />Donations:<br />http://www.eevblog.com/donations/<br />Projects:<br />http://www.eevblog.com/projects/<br />Electronics Info Wiki:<br />http://www.eevblog.com/wiki/
