I have a slightly earlier version, or a close cousin, of the NTBW50AA that I modified and I've posted photos of it on this list before: http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg
The LH plot from the NTBW50AA by quartz55 doesn't look quite right. Here is a LH plot from my NTPB15AA unit with most of the scale factors set the same as the scale factor in the plot from the NTBW50AA to make it easier to compare. http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15A_zps19b3bd33.jpg If you look at the temp plot from my unit it has small steps and is what I'd expect to see. The plot from the NTBW50AA looks like it has some smaller steps but it looks like it hits a limit at 36.750 and doesn't go beyond that value, which isn't right. It looks like a higher order bit is being turned on and off randomly causing the large apparent jump in temp, which probably isn't really happening because some of the other traces would be affected by any real jump that large. You could just ignore it because it would probably only have an effect during carryover. The NTBW50AA oscillator probably hasn't settled down yet because the DAC voltage is changing a lot more than mine and the 10Mhz doesn't look anywhere near as stable. The design of the 2 units appears nearly identical so I'd expect similar performance. Also the OSC ADEV at 10000 tau isn't close to what mine appears to be. That may improve after the unit has been on for a month or so but the temp plot just doesn't look right so the sensor may be bad. -Arthur _______________________________________________ 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.
