[time-nuts] Trimble Thunderbolt 10MHz amplitude jitter

Arthur Dent golgarfrincham at yahoo.com
Mon Apr 19 19:48:26 UTC 2010

Chris Smith-
 "The first thing I noticed was the Temp pane in TBOLTMON shows  -30.8C."
You may have missed my post yesterday where I said:
 "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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