> Hi Tom: > > I'm making progress on my precision clock and am wondering how the clock > in the HP 5071 is set and in particular how leap seconds are handled? > Also is there some way to move the edge of the output 1 PPS? How close > is the Sync function? > > http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3 > > Have Fun, > > Brooke Clarke
Brooke, For leap seconds, there is both a front panel menu and a SCPI command to program which future MJD is to have a 59, 60, or 61 second minute. A couple of FEI and FTS cesium standards also provide a method to schedule leap seconds if the clock is to be used as a UTC time source. For 1PPS sync, there are three methods. First, there is an external sync that works like most other clocks. The granularity is +/- 50 ns. Then there is a software slew command which moves the 1 PPS anywhere in +/- 50 increments. Finally, there is a frequency steer command which has a range of +/- 1e-9 and a resolution under 1e-14. So one can externally or manually sync a 5071A to 50 ns and then frequency steer at 1e-9 (that's 1 ns per second) until you get as close as you want. /tvb _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
