Do you know the part number of a chip to replace the DS1620?
Mike
On 8/16/2012 5:58 AM, Arthur Dent wrote:
I have two Thunderbolts that I'm monitoring with
Lady Heather. The temperature on the older unit
(MFG 2/26/2004) seems to track the
environment. The newer one (MFG 11-24-2004)
shows 44.750000 °C and only changes in increments of exactly 1°.
All REV-E Thunderbolts with date codes after about mid-2004
used the DS1620 "E" chip and have this problem. Buyers have
been told and believe the REV-E units are somehow superior to
previous revisions so they will ask a known problem unit. I think
they have seen articles on the internet that show really old units
with the noisy Piezo OXCO and somehow believe that only the
REV-E Thunderbolt has the newer Trimble OXCO, which is not
true. After about 2001 all REV-A through E Thunderbolts had the
new Trimble OXCO. I doubt you could find any with the older
Piezo OXCO now.
As far as I know there is only one U.S. seller of Thunderbolts on
Ebay that replaces the DS1620 in these affected REV-E units
with one that will display correctly with Lady Heather. I've heard
several stories from buyers who have bought problem Thunderbolts
from resellers, many of whom don't do any real testing to see their
units work properly or are stable. Ask questions before you buy.
-Arthur
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