FWIW, the "Theory" section here may help: http://www.g8wrb.org/data///HP/Better_than_100_ps_Accuracy_in_HP_5370B_Time_Interval_Measurements_Through_Bias_Error_Reduction.pdf
Phase errors through the splitters seem to be taken into account. The J06-59992A manual merely claims 100ps absolute accuracy is possible with the 5370A/B. On Sat, Jul 8, 2017 at 7:48 PM, Bob kb8tq <kb...@n1k.org> wrote: > 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 <t...@leapsecond.com> 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" <bruce.griffi...@xtra.co.nz> > > To: "Mark Sims" <hol...@hotmail.com>; "Discussion of precise time and > frequency measurement" <time-nuts@febo.com> > > 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 <hol...@hotmail.com> 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 -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > 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. > _______________________________________________ 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.