[time-nuts] Supply voltages for the Efratom 105243 10MHz OCXO

[Mike Millen]

Many thanks to both of you.

Is it safe to assume that the oven has its own temperature control system?
I ask, because I'd prefer to run it from  approx. 20v instead of 24v.

With a controller (& a room-temperature environment) I'm hoping that it 
would still be
operating at its design temperature with a lower voltage.

Comments?

Mike


Bob Camp wrote:
>
> The board looks a lot like a pull from a Lucent base station. The
> voltages would all make sense in that context. The unit swaps in for
> an LPRO and the 15V would be easy enough to come up with. I'd bet
> they ran both pins off of +24 though.
>
> Bob
>
> On Mar 19, 2011, at 5:20 PM, Arthur Dent wrote:
>
>> The pinout shown is close. The oscillator supply voltage on the
>> one I have in circuit is +15 @ low current. The Oven requires
>> 24VDC @ .25A and this drops to under 100ma when the unit
>> reaches operating temperature. There apparently is an internal
>> regulator on the oscillator supply and if you watch the output
>> level as you increase the oscillator supply voltage you will see
>> it increase until you hit about 13.5VDC then it remains constant.
>> This may mean that you could run the oscillator on either 15 or
>> 24 volts but where I'm only guessing what's inside the case I'd
>> stick with 15VDC to play it safe. The pin next to the output that
>> goes through the on board  diode is apparently an oven o.k. signal
>> that drops from 5VDC (cold) to around .8 when the oven reaches
>> operating temperature in around 3 minutes. This probably could
>> go to the base of a transistor with or gate input if you want to
>> use it to drive an LED. 0-5DVC on the EFC pin changes the output
>> by about 28Hz
>>
>>  -Arthur