[time-nuts] J06 HP-59992A time interval calibrator for HP-531xx counters

[Bruce Griffiths]

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 <holrum at 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.
> > 
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