[time-nuts] HP 58503A
azelio.boriani at screen.it
Fri Aug 3 14:29:02 UTC 2012
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:
> > 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.
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