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.
http://datasheets.maximintegrated.com/en/ds/DS1220Y.pdf
ROM is here:
http://www.eevblog.com/files/Prema6047-ROM-8-5-91.BIN
Previous video: https://www.youtube.com/watch?v=G-6BBF3HyRU
Forum: http://www.eevblog.com/forum/blog/eevblog-615-prema-6047-multimeter-followup
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