[time-nuts] HP 58503B GPS Time Reference

2012-07-25 Thread nde
My trusted 58503B displays strange values, this suddenly started a couple of weeks ago. TI values used to be within +- 50ns, now the monitoring software shows values going between +- 500 ns! What could be the reason for this? I replaced the internal UT+ GPS receiver, same results. Any

Re: [time-nuts] HP 58503B GPS Time Reference

2012-07-25 Thread Azelio Boriani
Have you another GPSDO with a PPS output? If not then try to connect the PPS output of the UT+ and the 58503 PPS output to a dual trace 'scope with persistence, trig on the UT+ and see the total span of the 58503 PPS. On Wed, Jul 25, 2012 at 10:59 AM, nde n...@hispeed.ch wrote: My trusted