[time-nuts] Datum Lamp Voltage

John Miles jmiles at pop.net
Tue Aug 28 17:19:03 EDT 2012


>From what I've seen, peaking the lamp voltage with the trimmer capacitor on
an LPro does not improve the stability.  It may even get a bit worse.  This
was the case on a couple of different units; I didn't investigate further.

-- john, KE5FX
www.miles.io


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of Bob Camp
> Sent: Tuesday, August 28, 2012 9:35 AM
> To: jfor at quikus.com; 'Discussion of precise time and frequency
> measurement'
> Subject: Re: [time-nuts] Datum Lamp Voltage
> 
> Hi
> 
> 6.0 to 7.0 volts is a *very* typical lamp voltage on an early LPRO.
> 
> Later production runs did something that bumped the number up to around
> 9
> volts. I've never seen any real data showing that the 9 volt parts are
> actually any better (or worse) than the 6.5 volt parts. The change could
> have just been a resistor value on a buffer amp...
> 
> Bob
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On
> Behalf Of J. Forster
> Sent: Monday, August 27, 2012 9:34 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Datum Lamp Voltage
> 
> Hi,
> 
> I'm just powering a new to me Datum Rb, Type 102500-001, LPRO for the
> first time. The unit locks up quickly, and after about an hour, I checked
> the Lamp voltage.
> 
> My unit is sitting at 6.9 VDC.
> 
> >From the manual on Didier's site, below 3.0 or over 14 indicate failure.
> Does anyone know whether the measured voltage should be for a new unit?
> I'm trying to guestimat the remaining life.
> 
> Thanks,
> 
> -John
> 
> ============
> 
> 
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