My Z3805A just started showing the red error lite on the front of the unit. All the tests show OK except the EFC Self Test = OK Int Pwr = OK Oven Pwr = OK OCXO = OK EFC = Err GPS Rcv = OK Any Idea where and what to look for? Thanks !!! Manfr

You can read the EFC value as either a percent (:DIAG:ROSC:EFC:REL?) or as an absolute value (:DIAG:ROSC:EFC:ABS?) to check if it is pegged (EFC is 20 bits). When the OCXO is sort of end-of-life the EFC should peg, it can be corrected if there is the mechanical frequency trim. The Z3805 should have the HP10811 (if it was not modified) that has the mechanical frequency trim. On Sat, Apr 27, 2024 at 7:08 PM Manfred Antar (KN6KBS) via time-nuts < time-nuts@lists.febo.com> wrote: > My Z3805A just started showing the red error lite on the front of the unit. > All the tests show OK except the EFC > Self Test = OK > Int Pwr = OK > Oven Pwr = OK > OCXO = OK > EFC = Err > GPS Rcv = OK > > Any Idea where and what to look for? > Thanks !!! > Manfr > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >