Let me strengthen the argument below. Let's say you are building and selling Rb units to the telcom industry and you've spec'd your product for use in the range of -25C to +85C. Now you want to include an ADEV plot in your sales literature. Should you place the unit in an environmental controlled box while you measure it? I think you'd be accused of fraud if you did not state that the plot is not representative of the full temperature spec. I think in order to be valid you always have to state the test conditions but you can use ANY test condition, Place it outdoors, in a lab or what ever but just say what you did and then your plot has meaning. I think the converse to true, that without knowing the test conditions the plot is little meaning.
> Why? Unless the unit is spec'd for use only at a constant temperature, > temperature variations are something it needs to deal with, and should be > included in any measurement of how good it is. In what way is temperature > variability special, that it shouldn't be included in ADEV measurements, but > all other contributors to variability should be? Certainly, there may be a > large non-random component to temperature (diurnal, annual, in many > environments), but there's also a significant part which is random - should > you somehow correct for one, but not the other? > > Shouldn't one expect the ADEV be better for a double oven OCXO than for a > bare crystal? > > The only issue I see is it may make fair comparison difficult, unless units > are compared under identical conditions. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
