[time-nuts] DIY FE-5680A lobotomy (disable temp compensation)

[Angus]

Hi Bert,

I am thinking about testing a heat pipe on a fan cooled setup I use.
The first temp controlled chassis I did used a peltier and works very
well, but was a lot more work to do and is much more power hungry. 

The main problem I find is not the temp controller itself, but rather
the change in the temperature across the chassis as the ambient
changes. However good the temp controller is, it only controls a
single point, but other points further away from the sensing
thermistor can vary a lot. 
I noticed you posted a picture of a heat pipe cooler a couple of weeks
ago - did you happen to compare the temperature across the unit with
direct fan cooling and the heat pipe cooler, or with different heat
pipes?

Angus.



On Sat, 28 Jun 2014 12:37:37 -0400 (EDT), you wrote:

>Will someone beside us use heat pipe. Would love to have an impendent  
>input. What does it take to get a test going. Scott has done a lot of work, how  
>about some one else step up to the plate. There are a lot of time nuts out 
>there  with the 5680A,many for the first time will have a very good 
>reference and some  of our experts with proper equipment can make a big difference.
>Bert Kehren
> 
> 
>In a message dated 6/28/2014 12:20:12 P.M. Eastern Daylight Time,  
>newell+timenuts at n5tnl.com writes:
>
>At 04:32  AM 6/28/2014, wb6bnq wrote:
>
>>monitoring process ?  In other  words have you traced out the 
>>connections to see what is driving the  pin you think is the temperature 
>input ?
>
>No. I've only traced back from  the ADC input to the voltage divider.
>
>
>>The next big question is  have you monitored the frequency and its 
>>stability, externally, to  observe what effects are taking place when 
>>you disable this input to  the A/D ?
>
>I have not.
>
>
>>That sounds complicated and messy  but may be easier than it 
>>appears.  An appropriate container  would be:
>
>It does sound messy. I don't think I'm willing to dunk one of  my units.