The former.
John WA4WDL
--------------------------------------------------
From: "J. L. Trantham" <[email protected]>
Sent: Saturday, June 11, 2011 4:16 PM
To: "'Discussion of precise time and frequency measurement'"
<[email protected]>
Subject: Re: [time-nuts] HP Z3801A, GPS vs UTC?
I have been wondering about this.
Since leap seconds accumulate from time to time, there must be a
'difference' between GPS and UTC. Is the difference related to the
rotation
of the earth around it's axis and around the sun and thus the need to add
a
second or so from time to time as we do with leap year or is there a
difference in the reference oscillator frequency between the two that
allows
a 'drift' of a second or so from time to time? I suspect the former.
Joe
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Magnus Danielson
Sent: Saturday, June 11, 2011 8:47 AM
To: [email protected]
Subject: Re: [time-nuts] HP Z3801A, GPS vs UTC?
On 06/11/2011 02:11 PM, Ron Hahn (EI2JP) wrote:
On 6/7/2011 10:40 PM, cook michael wrote:
Le 07/06/2011 21:15, [email protected] a écrit :
I have an HP 58503A. It has an "Option H14,H19" sticker on the back.
The circuit board has "58503-60001 Rev C" stamped on it. It has been
running continuously and locked to GPS for a few days, and it knows
the correct number of seconds between GPS and UTC.
The unit displays GPS time, without the leap seconds correction. The
front-panel display says "GPS xx:yy:zz", and ":system:status?" says
"GPS 1PPS Synchronized to GPS Time", not "to UTC" as the manual
shows.
I'd be much obliged if anyone could tell me how to get the unit to
display UTC instead of GPS time.
I think these use a similar command set to the Z3801A
try
:diag:gps:utc? should show 0 if the unit is in GPS,
1 if UTC
if that gives coherent results, try
:diag:gps:utc 1
to force the mode
Colleagues,
For someone who is not understanding these modes, can you explain what
is this difference between UTC and GPS time? I have a HP Z3801A which
I have been using for some years. Do I need to change this to UTC
time?
If you only wish a 10 MHz and PPS, no. GPS time will do just as well. If
you
also want UTC time for NTP server for instance, then you do want
either to use the UTC mode or let the server know it runs on GPS time
and compensate itself.
Cheers,
Magnus
_______________________________________________
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.
_______________________________________________
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.
