At 12:48 PM 8/29/2007, wayne burdick wrote...
Maybe I wasn't clear on this. I said it was "accurate to 1 Hz ... at
the calibration temperature." That says nothing about what happens as
the temperature *changes*.
[high stability] +/- 0.5 ppm ... applies to the entire temperature
range, not per degree C.
The REF CAL menu entry can be used to enter frequency-vs.-temp data
that's supplied with each individual 1 PPM oscillator. This data is
used in conjunction with an accurate temperature sensor to fine-tune
the reference in 0.2-Hz steps as the temperature changes.
Can the high stability reference also be calibrated at temperature to
achieve 1 Hz, like the standard reference, or must one trust the
calibration table which provides 0.2-0.5 ppm (10-25 Hz) accuracy? If
calibrated at temperature, does the delta then offset other table
entries (which might be used to accommodate crystal aging, for
example), or are individual table entries calibrated? Can a calibration
table be used with the standard reference?
I can see some applications where "1 Hz, but you have to calibrate if
the temp changes" is better than "10-25 Hz, but you never touch it."
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