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 _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
