Hi, If you've not already looked, it would be worth checking on the EEVblog since there were some discussions there on faults in these units - particularly the capacitor and lamp voltage issues. One of the temperature controllers could be a little unstable too.
Angus. On Tue, 23 May 2017 09:40:26 +0200, you wrote: >Hello Time-Nuts, > >i´ve been playing with some Rbs recently. > >I compared two LPFRS-01 to a PRS-10. One seems to behave quite well (compared >to the specs given here: >http://www.spectratime.com/uploads/documents/isource/iSource_LPFRS%20Spec.pdf) >- short term stability specs are met), the other one shows quite some phase >ripple (appx. 1 ns RMS with a frequency around 0.007 Hz) which spoils ADEV in >the 60 - 200s range, very similiar to the typical GPSDO bump. Long term >stabilty is OK. > >Unfortunatly I didn´t find any schematics on the web. Has anyone encountered a >similiar problem with this unit? Any idea were this might come from? My first >guess would be a problem in the control loop locking the VCXO to the Rb, but I >have no clue which time constants are used in the PLL. > >Any hints are appreciated. > >Regards, > >Matthias > >_______________________________________________ >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. _______________________________________________ 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.
