Hi It's tough to know just how far off of 24 V they compensated the oven. It's unlikely that they have a pre-regulaor on the heater. As you drop the voltage, the oven gain will also decrease. It's safe to bet that it will work at 24 +/- 10%. Past that - who knows... At 20% low, the failure is unlikely to be catastrophic. The impact will simply be a degradation in the temperature stability.
Bob On Mar 20, 2011, at 4:24 AM, Mike Millen wrote: > 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 > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
