[time-nuts] EFRATOM FRK Lamp Voltage

[Doug Millar]

HI,
         I would say that if it locks up and works, leave it alone. 
The lamps last a looooong time. Deal with it when or if it goes.
                 Doug


At 11:53 AM 8/9/2006, you wrote:
>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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