[time-nuts] Thunderbolt oven / non-stable operating temperature

Stan, W1LE stanw1le at verizon.net
Tue Dec 11 02:01:51 UTC 2012

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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