There is no question that direct fan control in combination with a heat
sink is the best solution and we use it on FRK and M 100 with proper thermal
insulation we get 0.01 C on the back plate and better than 0.1 C on the
front. For us the FE 5680 A is not in that class so we looked for a solu
Is a heatpipe really appropriate for this application? The heatpipe
expects that the heat source wants to burn up and so there's lots of
heat available to vaporize the liquid in the pipe. It's not clear to me
whether that situation exists with these Rb standards. My tests with an
FE-5680A sh
On Fri, 04 Jul 2014 02:35:41 +0100, you wrote:
>
>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
Hi
Yes, that’s one of the papers that shows their little chamber. I believe it’s
mentioned in a couple of other places. Die cast boxes work pretty well for the
enclosures. If you want to zero the gradient in the inner enclosure, put a
small fan in there. That adds it’s own issues so it’s probab
At 07:23 AM 7/4/2014, Bob Camp wrote:
There is a bunch of stuff on the Wentzel site about their double
wall mini-test chambers. It's probably the best approach to the
gradient issue. You still have a gradient around the inner chamber /
box, but it's consistent. You eliminate the coupling of th
Hi
There is a bunch of stuff on the Wentzel site about their double wall mini-test
chambers. It’s probably the best approach to the gradient issue. You still have
a gradient around the inner chamber / box, but it’s consistent. You eliminate
the coupling of the gradient to the ambient temperatur
Good Morning Angus
Let me start out by saying the FE5680A project was intended for time nuts
and the unit will not be part of our bench, so the work on it is limited. As
far as Rb's are concerned our focus is on FRK and HP5065. Looking back I
would most likely not suggested it, had I known ho
keep the heat sensing very close to the heating to avoid thermal control
oscillation ! a thermal time constant is large and no to easy to deal
with it
73
Alex
On 7/3/2014 6:35 PM, Angus wrote:
Hi Bert,
I am thinking about testing a heat pipe on a fan cooled setup I use.
The first temp control
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
At 11:01 AM 6/29/2014, Chris Albertson wrote:
Scott,
Could I ask you to post that "C crap" someplace? Would save me and
others some time.
It was posted back in 2012:
http://n5tnl.com/time/fe-5680a/control/fe5680_logger.c
Beware that the comments may be inaccurate. We now know more about
the
Scott,
Could I ask you to post that "C crap" someplace? Would save me and
others some time.
This temperature thing is complex enough that I'd like to try some experiments.
I want to run an FE5680 in an unheated attic where the temperature
swings 40F and then plot some data.
On Fri, Jun 27, 2014
>> 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.
This reminds me of the old Cray-2 super computer. The entire machine
about a half dozen racks were flooded
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
I can only answer some of your questions. The tuning word is modified by
the temperature but if it came back to the same oven current it will again
have the same tuning word to the DDS.
Since we have not fount a temperature sensor they most likely use oven
current that Bob mentioned.
If you d
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 t
systematic noise to dampen and
the tighter loop you make the more you will expose.
>
> Cheers,
> Magnus
>
> Originalmeddelande Från: Scott Newell
Datum:28-06-2014 03:50 (GMT+01:00)
Till: time-nuts@febo.com Rubrik: [time-nuts] DIY
FE-5680A lobotomy (d
On Sat, Jun 28, 2014 at 4:32 AM, wb6bnq wrote:
> wicking surface. The final question is how much, if any, external oil
> cooling would be necessary. That would have to be experimentally
> determined. The mineral oil, by the way, has a higher flash point then the
> container and is electrically
00)
> Till: time-nuts@febo.com Rubrik: [time-nuts] DIY
> FE-5680A lobotomy (disable temp compensation)
> Bert asked me to send an update on the FE-5680 tempco mod progress.
>
> It appears that the FE-5680A temperature signal (or maybe it's really
> a current sense sig
Hi Scott,
I reviewed the material at the N5TNL site and it leaves me wondering.
There are at least three different and separate temperature controlling
areas inside the FEI-5680. One of which has cannot be messed with due
to the fact that it is inherent in its design. That would be the
pos
Cheers,
Magnus
Originalmeddelande Från: Scott Newell
Datum:28-06-2014 03:50 (GMT+01:00)
Till: time-nuts@febo.com Rubrik: [time-nuts] DIY
FE-5680A lobotomy (disable temp compensation)
Bert asked me to send an update on the FE-5680 tempco mod progress.
It appears that the FE-56
-2014 03:50 (GMT+01:00)
Till: time-nuts@febo.com Rubrik: [time-nuts] DIY FE-5680A
lobotomy (disable temp compensation)
Bert asked me to send an update on the FE-5680 tempco mod progress.
It appears that the FE-5680A temperature signal (or maybe it's really
a current sense signal?) can be dis
At 10:40 PM 6/27/2014, Scott Newell wrote:
to pin 4 of the 4 channel 12 bit ADC. Command 0x22 returns the ADC readings
Doh! Correction: command 0x5A reads the ADC, command 0x22 reads the
DDS tuning words. Sorry for the confusion.
--
newell N5TNL
___
At 10:03 PM 6/27/2014, Chris Albertson wrote:
So the FE5680A will actually change the DDS tuning word based on an
internal temperature sensor?
It appears so. (Again, assuming it's actually a temperature sensor. I
guess it could be measuring heater current?)
on how it works. Does the FE568
So the FE5680A will actually change the DDS tuning word based on an
internal temperature sensor?
I could see why you might ant to disable this or maybe not depending
on how it works. Does the FE5680 first read the user programmed word,
apply a delta then write it back or does it ignore user setti
Bert asked me to send an update on the FE-5680 tempco mod progress.
It appears that the FE-5680A temperature signal (or maybe it's really
a current sense signal?) can be disabled by removing a single 10k
0805 surface mount resistor.
Using Elio Corbolante's terrific high-res scans, I've noted
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