https://stream.echo6.co/videos/watch/884bd209-78d6-44b5-80d9-a6e67648492e 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 / EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/ Wed, 10 Jun 2026 08:40:38 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/884bd209-78d6-44b5-80d9-a6e67648492e All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.