); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY > George for a single ground pin OXCO you might want to consider > compensating for the oven's internal ground bounce. The voltage drop > caused by a normal heater current is around 1/4 to 1/2mV for an MTI > 260 oven.
> All I can add in regards to the Fury GPSDO is: the EFC control voltage > ground, and heater ground MUST be Kelvin-sensed. > > Any ground loop error above about 10 - 50 microvolts would affect the > systems' accuracy on good double oven OCXO's. Hal, Said, and others, I need convincing that this single-ground-pin OCXO worry is valid. During the first few minutes of oven warm-up one can expect large variations in heater current. But during this time no one is concerned with EFC stability. So we ignore that case. After that, oven current is relatively constant by comparison. In a GPSDO the EFC is part of a closed loop. So even if there is a small voltage offset in the EFC control or return path due to heater current, it seems to me that it still has no effect on either the accuracy or the stability of the GPSDO. So we ignore that case too. Is the worry, then, about the minor ambient temperature related variations in steady-state oven current? Or something else? /tvb _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.