Hi nuts - I ran into this information on the Keysight site. The aging rate of a Keysight Option 012 ultra-high-stability oven in the first 90 days is: 1E-10 *30 days + 3E-9 * 2 months = 9E-9 In the first year, the aging rate is: 1E-10 *30 days + 3E-9 * 11 months = 3.6E-8 The second year (without adjustments) the aging rate is: 1E-10 *30 days + 3E-9 * 11 months + 2E-8*1 year = 5.6E-8 Above is from: Tips for making more accurate measurements with a frequency counter http://www.keysight.com/main/editorial.jspx?cc=US <http://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=505277&nid=-3 3788.536880944.00&id=505277> &lc=eng&ckey=505277&nid=-33788.536880944.00&id=505277 It makes a case for using a GPSDO or other external reference or frequent re-calibrations of the -012 oscillator. Regards, John
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