[time-nuts] Trimble Thunderbolt 10MHz amplitude jitter

Chris Smith chris at evib.net
Mon Apr 19 20:31:39 UTC 2010


On 19 Apr 2010, at 20:48, Arthur Dent wrote:

> 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."      

I only joined this list a few hours ago and hadn't searched the archive for which I apologise.

Many thanks for the info re the DS1620 chip. I'll have to take the lid off and see what is currently installed.


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