The LM399 datasheet specifies a temperature coefficient "\$\Delta\$T/\$\Delta\$Temp". The conditions state an ambient range but don't specify if that's with or without the heater on.
Which is it?
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Where the Temperature Coefficient goes, I see dV/dT, but no dT/dT. Whatever it is, T is the temperature that the Zener sees, doesn't matter with or without the heat from internal or external heater. BTW, could you answer, please, [this one](https://electronics.stackexchange.com/questions/596678/how-to-select-all-the-capacitors-with-0-1uf-in-pads-logic-vx-2-3), if you know it? – jay Nov 25 '21 at 23:10
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If you read the Note 3: "These specifications apply for 30V applied to the temperature stabilizer and –55°C ≤ TA ≤ 125°C for the LM199; and 0°C ≤ TA ≤ 70°C for the LM399."
Means that the heater is ON and powered through 30V. If you use different heating power, precision might vary.
thexeno
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Ah! I totally missed that note 3 applied to the table on the previous page too! – user1816847 Nov 26 '21 at 05:44