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Want a 5ppm/C (max) reference? Then don't buy a voltage reference...
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--- Quote from: splin on November 04, 2019, 03:25:51 am ---Even the hermetic metal can version of the LM399 used in 6 1/2 digit meters including the 34401A was only specced at 20ppm/1000h!

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Afaik those lm399 that go into 6.5digit dmms are aged and specially selected. A good lm399, if treated well,  gives 1-2ppm long-term stability.
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