[time-nuts] Thunderbolt temperature anomaly

Arthur Dent golgarfrincham at yahoo.com
Sun Apr 18 11:16:38 EDT 2010

I had a thunderbolt that displayed a temperature reading of -54.99°C, which 
I was pretty sure wasn't correct. ;-)   Apparently the reference in the DS1620 
chip either shorted or opened so this "D" revision chip was outputting its 
lowest possible reading. I replaced it with a "C" revision chip that I found 
(date code 9710C2) and it works great. 

So If you have an "E" revision DS1620 chip that displays the temperature in steps 
and you want to replace it, either a "C" or a "D" revision chip appears to work 
as a replacement. Trimble apparently started using the "E" revision chip around 
mid 2004.      


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