> Also on an unrelated topic, I found an HP 59309A HPIB clock on a forgotten > shelf > and looked at it, and was surprised to see such a poor primary time standard > oscillator inside, just a 1Mhz crystal using a cmos buffer oscillator. It can > accept an external standard, but it did feel odd for a device that is meant > to > provide coordinated system time to be so modestly executed. it's like an > uncorrected PC desktop clock.
Walter, The hp 59503A was intended as a GPIB "system" time of day clock in the days before PC's had their own clocks, or before NTP or GPS existed. Imagine a 19" rack with 2 or 3 or 10 HP-IB instruments all on the same bus doing some complex experiment yet and no instrument knows the date or time-of-day that the data is collected, or maybe the controller needs to synchronize events across several instruments. Well, just add a 59503A and you're all set. It even has a battery backup option. To their credit, and unlike a PC, there is an external frequency input, so you have control over the accuracy. It's a beautiful little instrument (lots of discussion in the archives). /tvb _______________________________________________ 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.
