Jarl Risum gave me some info which could explain that. His PRS10 1PPS rise time , taken at the unit DB connector pin, was about 50ns, which is in the same ballpark as mine, but he noted that if the Breaklout Board is installed , the signal passes through a two Schmitt inverters (74HC14s). These might well stiffen it up, having a rise time of 7ns, though adding delay. So if your box has similar interface circuitry that could be it.
Thanks for your input. Le 28 janv. 2014 à 19:16, Robert Watson a écrit : > Mike, > > I just measured my FS725 (a PRS10 in a box). The nearest scope was an > analog with only 100MHz bandwidth. The PPS risetime was about 5.5ns.The > usual analog scope risetime is 0.35/bandwidth so that puts scope risetime > around 3.5ns. Whatever the PPS risetime really is, it's an order of > magnitude less than your 70ns for sure. > > Best, > > Robert. > > > On 28 January 2014 14:30, Chuck Harris <[email protected]> wrote: > >> Time-nuts isn't yahoo. It is something that John Ackermann >> put together called febo.com. Febo is one of John's cats. >> >> Most probably, the OP's email program is set to not display >> emails which appear to originate from his address... >> >> -Chuck Harris >> >> >> Chris Wilson wrote: >> >>> >>> >>> My recent attempts at posting have been all been blocked for some >>>> reason so I am switching email address in the hope that that corrects it. >>>> >>> >>> Here is my last one, hoping that it is not a repeat for you guys. >>>> >>> >>> Hi, >>>> I have just brought my PRS10 out of mothballs and am trying to >>>> get a good lock to my TBolt 1PPS. >>>> The 1PPS OUT signal from my PRS10 has a very slow rise time, in >>>> the order of 70ns. I would be grateful, if anyone here has one on >>>> their bench, to let me know what theirs is. I can't find any >>>> specification in the literature. >>>> Thanks and have a good day. >>>> Mike >>>> >>> >>> >>> >>> 28/01/2014 11:37 >>> >>> Hi Mike. >>> >>> Both messages (the earlier one from the orange.fr address and this one >>> from the sfr.fr address) are showing. If you read the group using >>> e-mail just CC the messages you post back to yourself and filter into >>> the groups folder. Seems Yahoo changed things (again) recently. >>> >>> _______________________________________________ >> 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. _______________________________________________ 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.
