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iSource+TM Rubidium Clock
Lifetime and MTBF Data
November 2014
LPFRS / RMO / STARLPRO / LNRClok / GRClok Rubidium Clock Lifetime and MTBF
Contents
Life Time ........................................................................................................................ 1
MTBF Calculation .......................................................................................................... 3
LPFRS / RMO ...................................................................................................3
StarLPRO / LNRClok / GRClok ........................................................................3
Life Time
The aging of the Rb lamps due to the diffusion of rubidium metal into the glass walls of its bulbs, has been
previously studied by Mr, C.-H. Volk and Mr, R.-P. Frueholz, of Aerospace Corporation, CA, USA.
These studies have been carried out using the differential scanning calorimetry technique.
The calorimetric technique measures the elemental Rubidium content in a lamp used in normal conditions.
TNT is using the SCHOTT glass 8436 type, which has been proved to be presently the best alkali resistant
glass on the market .
The figure 1 shows the rubidium consumption of a lamp made of SCHOTT 8436 glass, and shows a logarithmic
curve of the rubidium consumption, which is approximately 100