> 12) provision for measuring OCXO case temperature and power supply > current to allow compensation for variable internal wiring voltage > drops for those OXCOs that do not allow Kelvin sensing of the EFC > varactor voltage.
> Some OCXO's (FTS1200 etc) do not have independent sensing of the EFC > varactor differential voltage, so the temperature dependent voltage in > the internal "ground" wiring drop due to the variable oven current > will modulate the OCXO output frequency when the DAC ouput voltage is > fixed. If this effect is modelled sufficiently accurately then the > DAC output can be adjusted to compensate. Does anybody have a list of OCXOs with a separate ground pin for the oven? Some of the OCXO data sheets I've looked at have a Vref output. Seems like a good idea. They already have good temperature control and that's most of the trouble with getting a stable reverence voltage. Do any OCXOs also include the DAC internally? Isn't that the obvious next step? -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
