GPS time differs from UTC by the number of leap seconds accumulated since
the start of GPS time. Reseting the GPS clocks each time a leap second
occurs would upset the code generators. The satellites stay in GPS time but
do transmit the difference between UTC and GPS time to allow receivers to
make the conversion. If your time display is in sync with the seconds time
signal from WWV or CHU, your system is set to display UTC. GPS time is
currently ahead of UTC by 15 seconds. Each time a leap second is added, UTC
falls one more second behind GPS time. If a leap second is subtracted, UTC
will move closer to GPS time.
See: http://leapsecond.com/java/gpsclock.htm
John WA4WDL
--------------------------------------------------
From: "Ron Hahn (EI2JP)" <[email protected]>
Sent: Saturday, June 11, 2011 8:11 AM
To: <[email protected]>
Subject: [time-nuts] HP Z3801A, GPS vs UTC?
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?
Thanks,
Ron
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