Fluke.l (China) was selling a number of 1938's on Ebay. I snagged one just to have a piece of HP history. It works just fine, but I've noticed something a little strange.
Comparing the 1938 to both my cesium and GPS standards, there's a distinct periodic 1ns phase shift every second. Seems to smoothly advance 1ns for 500 ms, then retard back to the original phase point over the next 500ms. Question: is this to be expected? I'm assuming this is from the AFC loop, but I would have expected it to be better damped. I've searched both this group and the HP group; there really doesn't seem to be a great deal of info about these, other than schematics and some nice variance plots on leapsecond. Just what is the serial port and the PIC data lines useful for, if anything? -- Bill Ezell ---------- They said 'Windows or better' so I used Linux. _______________________________________________ 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.