Arnold, Thanks. I had a dirty BNC connector so I am now getting 5 volts and 10us wide. I cannot get the counter to lock. There has to be a way of getting it to work.
Regards, Pieter ----- Original Message ----- From: "Arnold Tibus" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Saturday, August 30, 2008 10:12 AM Subject: Re: [time-nuts] Trimble Thunderbolt 1PPS TTL level? > On Fri, 29 Aug 2008 22:21:43 -0400, Pieter Ibelings wrote: > >>Hi All, > >>I got a Trimble Thunderbold from Ebay and I am having trouble triggering >>the >>HP 53131A. The 1PPS output shows a 10us pulse of 1 Volt into a high >>impedance probe. This seems low to me. Should it be 5 volts? Maybe the >>output 74AC04 is toast? > >>Pieter, N4IP > > Hi Pieter, > there is nothing to be worried about, I have the same problem with my > 53132A, it does not trigger on it with 50 ohms or high impedance load. > So I tried it with the 5334A - no problem at all ! It does trigger as > expected, > without any signal loss. > Seem to be a problem of the 53131A/ 53132A series counter. > > regards, > Arnold > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.