Hello S.W.,
On occasion I get an "ALARM 4000" with Lady Heather V3.10,
However I know not what it means. The alarm is transient.
Over the past weeks it only occurred twice.
I just checked my T'Bolts and 2 of them displayed a partial PPS Adev
(upper) table
but a full OSC Adev table (lower). I just did a clear, C then a B.
I know not what caused that.
Could of been a utility power transient, LH/computer is on an UPS
but the T'bolt power supplies are not.
I am using a TC = 999 seconds with a dampening factor of 0.70
I am consistently getting ~ at 10K tau, low -13's
Stan, W1LE Cape Cod FN41sr
On 12/10/2012 6:37 PM, Sarah White wrote:
On 12/10/2012 6:10 PM, Arthur Dent wrote:
I believe that the high temperature alarm you see is triggered at 50 degrees
C. If that is what you're seeing without artificially raising the temperature
of the Thunderbolt by insulating it so it can't radiate the heat, what I said
about replacing the chip is correct but if it is staying within a few degrees
over the course of the day and is in the 40 degree C range without being
insulated, the DS1620 thermometer chip is o.k..
My particular thunderbolt seems to be from 2004, so I guess that manual
is at or around checked:
ThunderBolt[tm] GPS Disciplined Clock User Guide Version 5.0
5.0 is a version of the manual published in 2003
Table C.2.2 Environmental Specifications:
Operating Temp: -0°C to +60°C
Storage Temp: -40°C to +85°C
... so I guess I shouldn't worry about a few degrees of difference in
the reported temp, especially considering that the sensor in question
isn't on the OCXO itself.
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