[time-nuts] HP 58503A

[Azelio Boriani]

What 'scope are you using (brand and model)? TLL is 5V, CMOS 4000 series
can be 15V but runs starting at 3V. Set the scope vertical (channel 1) at
1V/div (probe at 10:1), use NORMAL for the trigger and set the trigger (for
the channel 1) *slowly* from 0V to +200mV (assuming that the trigger isn't
aware of the 10:1) trying to follow the trigger indicator or the trace
appearing on the screen.

On Fri, Aug 3, 2012 at 3:31 PM, <bg at lysator.liu.se> wrote:

> Doug,
>
> > I ran into a wiki description of GPS using WGS84 a couple days ago. It
> > included a mention of ESEC and it was something like: Earth Static,
> > Earth Centric. I think I was following a link about the Z3801A.
> >
> > It referred to the fact that lat-lon is referenced to a static grid on
> > the Earth and doesn't change as the Earth rotates on its axis or around
> > the sun. Earth static and Earth centric.
>
> That reference frame is called Earth Centered Earth Fixed  (ECEF). And
> that is what GPS is using "internally". However it is not lat/lon/h, but
> cartesian with origo in the earth center, xy in the equatorial plane and z
> pointing towards the north pole.
>
>     http://en.wikipedia.org/wiki/ECEF
>
> --
>
>    Björn
>
>
>
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