[time-nuts] FE-5680A Voltage tolerance
ed_palmer at sasktel.net
Thu Jan 19 21:43:11 EST 2012
Speaking of aging, can anyone explain FEI's spec for aging on the
5680A? 2e-11 per DAY? Seriously? Everyone else specs their Rb
standards in the Xe-11 range per MONTH. When I first saw it, I thought
it was just a typo, but it's in multiple documents and web pages and
it's been there for years.
On 1/19/2012 7:35 PM, EWKehren at aol.com wrote:
> As soon as my next unit comes in I will run some controlled tests. This one
> refuses to show aging with week 9 up in two days. I will use it for other
> tests before I take it appart.
> In a message dated 1/19/2012 8:18:10 P.M. Eastern Standard Time,
> ed_palmer at sasktel.net writes:
> I would expect the RF circuitry to handle a lower voltage without too
> much trouble. However, a lower input voltage means it will take longer
> for the ovens to come up to temperature. Until they stabilize, a lock
> probably won't happen.
> Once the unit has warmed up and locked, how low can you go and still
> maintain lock? As you drop the voltage, the ovens will run closer to
> full on. Once you reach the point where one or more of the ovens are
> full on, further voltage reduction will quickly cause issues.
> On 1/19/2012 5:45 PM, gonzo . wrote:
>> Experiment for the day.
>> I thought I'd follow Dons quote and see how tolerant my unit is.
>> My benchmark is at 15.5V it locks in about 3min.
>> I backed off the supply to 10.8V and the lock time (from cold) is 8min.
>> I thought this was interesting given several people report they are unable to get a lock when running lower voltage.
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