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--------------------------As we known,the lamp life is the most important thing for rubidium oscillator,rubidium oscillator with rubidium lamp inside,normal speaking the more working service hours ，the less lamp life。OK，such as LPRO with the at least 10 year offical warranty of lamp life。so the date of made is the。。。。。OK。-----------------------------Symmetricom's Irvine operation, originally known as Efratom, was founded in 1972 and purchased by Datum in 1995 from Ball Aerospace. Several industry firsts and patents were established by Efratom and Datum-Irvine......----------------------------------------------------------from above line...we can guess the efratom-----datum-----symmetricom now...so the datum label LPRO meanning better life time...you find the different from the serial numberOk all clearly。。。。============================================== The LPRO is designed for long operating periods without maintenance (long life Rb lamp, extended crystal control range) with a goal to exceed 10 years. The design provides a stable frequency with good short and long term stability, and excellent spur performance.PDF format manual for this module http://www.symmetricom.com/media/pdf/manuals/man-lpro.pdf Key Features10 MHz Sine Wave1.5 Inch Total Height<5e-11/month AgingSingle 24 Vdc Supply; Wide Operating Supply Range (19 to 32V)Alarm Signal for Rb UnlockMeets TDMA and GSM Frequency Requirements Without an External Reference or Routine CalibrationCE Compliant We test all the Rubidium Oscillator before delivery. The pictures below shows one sample. What you will get is orininal sealed(already tested and calibrated in our lab)MY test lab ---------------------NOW we are selling DATUM LPRO Rbidium oscillator--------Below efratom just for sample-------- ------------------------------------------------------------------------------------------------- below just for sample, you are bidding ONE(1) unite efratom lpro-101 rb oscillator following spec from http://www.leapsecond.com/museum/lpro/ Thank you for tvb Data Files [2005-07-08 09:15:46] 1,013,412 log20696.txt 84451 seconds (= 23 hours) Stability from Tau 0.1s to Tau 20k Comparison Stability of 4 rubidium frequency standards: On May-08-08 at 18:30:57 PDT, seller added the following information: Sellers: Delight buyers. Get your own map of past buyers. On May-26-08 at 11:14:14 PDT, seller added the following information: Pay with PayPal: Get a MyStoreRewards invitation for cash backOn Oct-16-08 at 06:08:44 PDT, seller added the following information: æ— æ ‡é¢˜æ–‡æ¡£ Today we will tell something on The Erfatom FRS rubidium oscillator As we know,the FRS oscillator will the TTL and 10mhz square wave Output. and the price in my store ,very reasonable. most of my buyer all the Ham radio fans.certainly, a poignant contrast;if you use with the rubidium as your frequency standard, you will NOT need to care about the phasic noise,just the stability. so why the rubidium even hydrogen atom oscillator is the best choice as the lab's frequency standard. i can tell you,some of my customers from Center of Quantum Computation in Singapore,Princeton,and tvb (the administrator of time-nuts) . why the lab even super fans always will buy some or one the rubidium oscillator? Yes,the answer the LIFE of The LAMP life. As we known,just like the lives in the earth,the rubidium oscillator also with the life time.if you use the rubidim oscillator so hard,,, the rubidium lamp will dead...so...u need change the lamp... so the MFR date is the big problem to us. just set the FRS for simple. Yes,all above just tell whom what purchase one FRS rubidium oscillator ,u should pay attention to what you are buying or paying... A man that breaks his word, bids others to be false to him---one Chinese proverb .
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