Hi Based on a quick read of the use of the device, they seem to be relying on it to be << 100 ps off from “ideal”. How much it being non-ideal matters …. not clear. If you are correcting for various errors and eliminating both unknown source errors and destination errors it likely gets messy.
Bob > On Jul 8, 2017, at 9:14 PM, Tom Van Baak <[email protected]> wrote: > > I knew we had talked about this before: > https://www.febo.com/pipermail/time-nuts/2006-August/021649.html > > The J06-59992A manual, schematic, app note, and patent are here: > http://rubidium.dyndns.org/~magnus/instruments/hp/J06-59992A/ > > It was designed for the hp 5370 (20 ps) so perhaps the tolerances are less > stringent if only used for hp 53132 (150 ps). Maybe one of you RF guys can > tell from the schematic? > > Mark writes: >> Yes, they do show up... but usually for big-ish bucks. I want to build a >> small affordable replacement that anybody with a 531xx can have. > > I don't recall them being expensive at all, just unusual. But making a modern > one for time nuts is a great idea -- both 5370 and 53131/53132 users. Also, > when someone gets around to creating a smart analog front-end to John's TAPR > TICC board, your 59992A clone will come in handy. > > Note also this recent document by Bill Riley: > > http://www.stable32.com/A%20High-Resolution%20Time%20Interval%20Counter%20Using%20the%20TAPR%20TADD-2%20and%20TICC%20Modules.pdf > > Hal writes: >> What does "good" mean? >> I'd expect the variations due to power or temperature would be easy to >> measure. >> Delay through classic CMOS is linear with absolute temperature and inverse >> linear with supply voltage. > > When John created the TAPR TADD-2-mini board I tested the jitter using a > TimePod (integrated phase noise mode). I'm looking for the web page or email > now, but I recall it was under 2 ps. This is partly due to the fact that the > PIC 12F is a fully synchronous MCU; no tricks with double clock edges or > PLL's. > > /tvb > > > ----- Original Message ----- > From: "Bruce Griffiths" <[email protected]> > To: "Mark Sims" <[email protected]>; "Discussion of precise time and > frequency measurement" <[email protected]> > Sent: Saturday, July 08, 2017 4:48 PM > Subject: Re: [time-nuts] J06 HP-59992A time interval calibrator for HP-531xx > counters > > >> A run of the mill 2 way power splitter has better than 10ps phase matching >> at 100MHz there are few digital devices that offer that degree of matching >> at best they are usually 10x worse. >> >> Bruce >> >>> >>> On 09 July 2017 at 06:58 Mark Sims <[email protected]> wrote: >>> >>> Yes, they do show up... but usually for big-ish bucks. I want to build a >>> small affordable replacement that anybody with a 531xx can have. >>> >>> My design is currently leaning towards a board with the clock generator >>> and a 5V reference for the gain calibration (they spec 5V +/- 1mV). I was >>> going to use a couple of 2P4T slide switches to route open circuit, 5V, >>> normal clock, and inverted clock to the two output connectors. >>> >>> I think the cost to build would be in the $20 range and fit on a 2x2" or >>> so circuit board... certainly more attractive than a $500 big ancient box >>> with unobtainium parts in it. The board should be able to perform all the >>> calibration steps for the counter. >>> >>> I don't think the signal requirements are super critical. They are using >>> 1:2 splitters and splitter/180 degree phase shifters and relays to generate >>> the output signals passively from the inputs. I think a digital clock >>> generator would be a LOT more accurate than those phase shifters. >>> >>> ---------------- >>> >>>>> >>>> Actually, you can get J06 HP-59992A calibrators on eBay. >>>> > > _______________________________________________ > 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.
