Hi Maybe it only has a 20 year life if you power it up 50% of the time :) Somehow I doubt that it only has a 10 year “power on” life.
Bob > On Jul 25, 2016, at 3:55 PM, Skip Withrow <[email protected]> wrote: > > Hello Time-Nuts, > > I just ran a Symmetricom X72 for 10 days to check the rate of the Pwr HRS > counter. At one point I thought I did this with an SA.22c and found a > discrepancy between actual number of hours run and the counter increment. > I can report that the X72 does appear to count hours correctly. After > running for 233 hours the hex counter incremented by 233 decimal. > > This leaves me with some questions though. The counter in the unit is four > hex digits giving a max count of 2^16 or about 65,000. The life of the X72 > is supposed to be about 20 years (roughly 180,000 hours). So what happens > to the unit on overflow, does the counter just rollover? So how do you > tell a new unit from one with 70,000 hours on it? And there is also a > service bit that is supposed to switch when there are several months of > life left, what drives this bit? Is it some kind of lamp life measurement > (like the LPRO), and is the power on counter involved in any way? > > The Symmetricom X72 and SA.22c seem to be cousins, I have not played with > an X99 and don't know if it is related. If someone has insight into these > units I would be most interested in knowing some of the answers. In fact, > the 'w' command dumps about 26 different values (all in hex) and having the > secret decoder ring for what the item mnemonics are and the scaling of the > displayed values would be very useful. The user manual lists the 'w' > command but gives no information regarding the resulting display that I can > find. > > Thanks in advance for any help. > > Regards, > Skip Withrow > 303-790-1830 > _______________________________________________ > 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.
