[time-nuts] Datum Lamp Voltage

Bob Camp lists at rtty.us
Tue Aug 28 12:35:10 EDT 2012


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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