Another info about the HP5065A. Some test Cooling the HP5065A from 39.5 to 29.5°C (chassis temperature) show a 2E-13 / °C, positive slope. The first graph show the frequency drift, the second the temperature drop and the voltage at the A15 pin 2 (magnetic field set point regulator). I am working on a project to compensate pressure and temperature starting from the Corby Dawson study. I am planning to made an smd version of the board. This circuit with some minor change can be applied to any Rubidium standard. Luciano Timeok
[GPIB0--9--INSTR].pdf
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