[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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