[time-nuts] EFRATOM FRK Lamp Voltage

[Paramithiotti, Luciano Paolo S]

Hi,
it's normal,
After replacing the lamp you have to readjust some parameter as
described in the manual.
Luciano

Luciano P. S. Paramithiotti


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Joe McElvenney
Sent: Wednesday, August 09, 2006 8:54 PM
To: time-nuts at febo.com
Subject: [time-nuts] EFRATOM FRK Lamp Voltage


Hi,

   A few years back I obtained a Racal-Dana rubidium standard with a
EFRATOM FRK-L fitted. I was concerned that the indicated lamp voltage
was about 5.5V where the book says it should be between 6 and 12V.
Subsequently I obtained another lamp from a surplus source hoping that
the voltage would move upscale when changed. Unfortunately it didn't and
has stayed around 5V, slightly lower than the original. I can't put the
old one back because I cracked the glass when prizing it out of the
sealing compound.

   So, was I seen off or is this typical of the voltage spread likely to
be encountered? I must say that the unit locks up quickly enough and
works fine as far as I can see. I realise that the lamp voltage is only
the output voltage of the first op-amp after the photo-diode and may not
be a reliable indication of its true health.

   Anyone know of a cheap source of spare lamps?


   TIA - Joe


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