[time-nuts] Improving the stability of crystal oscillators
donmer at woosh.co.nz
Sat Oct 13 20:45:17 EDT 2007
Thanks for that John. I`ve always wanted to play arround with one of these
[Peltier] modules. They can now be bought quite cheaply. I envisage a double
oven, with the inner oven heated [to 25 degrees], by conventional means,
while the Peltier pile cools the inner oven. This way you could use
a precision temparature regulator for the inner oven, while the outer "oven"
would only have to cool. You wouldn`t be talking too many pumped watts,
FWIW etc.,.......................................Don C.
----- Original Message -----
From: "Neon John" <jgd at johngsbbq.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Sunday, October 14, 2007 11:19 AM
Subject: Re: [time-nuts] Improving the stability of crystal oscillators
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+donmer=woosh.co.nz at febo.com RETRY
> Nah, not for this application. A Peltier module typically has a COP of 1.
> That is,
> it moves a watt of energy for each watt consumed. Thus, for each watt
> moved, two
> watts have to be dissipated to air.
> I can't imagine a well-insulated quartz oscillator needing more than a
> watt or two of
> cooling at the most. A heat sink capable of handling 4-5 watts should do
> the job
> just fine.
> Don: I've seen peltier-controlled "ambient" ovens before but I can't
> recall the
> details. I'm fairly sure one was a Fluke precision voltage transfer
> standard in
> which the zener reference diode was controlled to a constant temperature.
> The advantage of using room temperature, e.g., 70 deg F, is that under
> conditions, the peltier module is doing little to nothing, perhaps just
> ridding the
> ovenized unit of the few milliwatts dissipated in the circuit itself.
> I've used multiple cascaded modules to cool a nuclear detector (Silicon
> barrier diode) to reduce its noise. Not as good as LN2 but much cheaper to
> On Sat, 13 Oct 2007 13:26:52 -0700, Brooke Clarke <brooke at pacific.net>
>>They are very inefficient to the point that a system that's supposed to
>>something may heat it because of all the heat generated by the module.
>>It takes a huge amount of heat sinking or liquid cooling to get them to
>>Don Collie wrote:
>>> ); SAEximRunCond expanded to false
>>> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
>>> Has anyone concidered using a small Peltier pile to maintain the
>>> temparature. I understand that these devices will heat or cool, so it
>>> be possible to maintain the crystal temparature at , say, 25 degrees
>>> celcius, over a range of ambient temparatures
>>> [perhaps 0 to 70 degrees]. There would be several advantages in this
> John De Armond
> See my website for my current email address
> http://www.johndearmond.com <-- best little blog on the net!
> Tellico Plains, Occupied TN
> I like you ... you remind me of me when I was young and stupid.
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