[time-nuts] HP Z3801A, GPS vs UTC?

Ron Hahn (EI2JP) ei2jp at dhco.org
Sat Jun 11 12:11:49 UTC 2011

On 6/7/2011 10:40 PM, cook michael wrote:
> Le 07/06/2011 21:15, rtm at lcs.mit.edu 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

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?



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