#5) Everyone likes blinkenlights.
> On Jan 22, 2017, at 08:55, jimlux <[email protected]> wrote: > >> On 1/21/17 10:31 PM, Ruslan Nabioullin wrote: >> Hi, looking at pictures of various time metrology equipment setups for >> best practices and inspiration, I have commonly seen time of day display >> unit(s) installed in racks containing processing or time transfer >> equipment, e.g., >> http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg. >> All that these units do is merely display the time of day and sometimes >> the date, typically by means of seven segment LED displays, of the time >> code inputted to them (typically IRIG-B, I'm guessing). > > There's a few reasons I can think of: > 1) the display is also a distribution amplifier of some sort - one time > source going into rack, distributed to things in the rack (or the next rack) > > 2) as phk commented, it lets you know that your time code isn't broken (i.e. > someone got in behind the rack and disconnected the wrong cable) > > 3) It's a crude visual check - your eye/brain is pretty good at catching a > change in the pattern of blinky lights. IN this situation, you'd expect all > the displays to change simultaneously. > > 4) the equipment configuration "just growed" from a collection of smaller > ones, each with its own display. > > We put displays like this in all of our ground support equipment (GSE) racks > when doing spacecraft or subsystem tests, mostly for reason #2 and #4. > > You might have a GSE rack or two in the lab when you're building up the > subsystem. Someone else's subsystem has their rack, also with a timecode > display. When you bring the two subsystems together for integration, you > bring the racks with them, and it's not worth it to reconfigure. > > > > _______________________________________________ > 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.
