); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY
[from two separate messages] > Any ground loop error above about 10 - 50 microvolts would affect the > systems' accuracy on good double oven OCXO's. > 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. I'm missing something. MTI has been in this business for a while. I'm assuming they aren't dumb. Why are they still making (otherwise) very high quality parts with only a single ground pin? I'm not picking on MTI. They are just a handy example. Many of the data sheets I've looked at have only one ground pin. My first guess is that it's a backwards compatibility mess. Ages ago somebody made a part with a single ground pin and somebody used it in some telco gear and everybody has been using the same footprint ever since. If that's the case, I'd expect there would also be a variation with a second ground pin to get better performance. How much better would their part be if they had a second ground pin? Are they running temperature tests with the EFC pin open so they don't see any problem as the heater current changes? (or something like that) -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.
