[time-nuts] Tbolt Temp Sensor

Peter Loron peterl at standingwave.org
Sun Apr 24 10:47:56 UTC 2011


If you are in need of a replacement DS1620C, I have many available. Please contact me off list. Thanks.

-Pete

On Apr 23, 2011, at 6:29 PM, Arthur Dent wrote:

> "One of these units appears to have an onboard temp 
> sensor that is dead - the temp just reads -55.0C all the 
> time.  This is the little Maxim/DallasDS1620 chip, which 
> I can replace, but I had a few questions first."
> ++++++++++++++++++++++++
> 
> I've had about 50 Thunderbolts and at least 5 of them had 
> a defective DS1620 chip. About 3 more were from late 
> 2004 or early 2005 and had the "E" revision chip that 
> displays the temp in about 3/4 degree steps. Of the ones 
> that failed the common failure mode was to display 
> -54.999 degree C even though I'm sure it wasn't quite 
> that cold in my shop. ;-)
> 
> If you replace the chip just make sure that the replacement 
> chip is a "D" or "C" revision if you want the Lady Heather 
> graph to look nice. 
> 
>  -Arthur
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