[time-nuts] New NTBW50AA
Bob Camp
lists at rtty.us
Tue Sep 10 17:56:59 EDT 2013
Hi
I have quite a few of these and they all produce temperature plots that look like proper TBolts. I also have TBolts that don't read the sensor in high resolution mode. I have a couple TBolts with broken temperature sensor chips. Assuming the room temperature is varying several degrees C up and down over the time shown, those plots most closely resemble a TBolt with a blown chip.
Bob
On Sep 10, 2013, at 3:38 PM, Arthur Dent <golgarfrincham at yahoo.com> wrote:
>> Mark Sims holrum at hotmail.com
>> Tue Sep 10 09:03:24 EDT 2013
>>
>> Again, THE TEMPERATURE SENSOR IS NOT BROKEN!!!!!!!!!!!!!! The firmware in
>> some of these units (those from NTPX modules) does NOT read the temperature
>> sensor in high-res mode.
>
> I have sold over 200 T-bolts and had to replace about 30 of their thermometer chips,
> most because of the revision problem causing the 'stepped' temp plot, but some
> because of chip failure. If this were the typical low res problem the yellow trace
> would show the characteristic uniform staircase steps, not the random jumps to
> some common value that it never exceeds. If you look closely at the plot you'll
> see many very small changes that are far smaller than any of the steps would be.
> Also there are major portions of the trace where it is absolutely flat and I doubt that
> this is really happening. I'll stick with broken but maybe someone else with another
> NTBW50AA can run LH and show what their graph looks like.
>
> -Arthur
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