The FE-5680A 1pps is not sync'd to UTC.
According to my calculations, it would take several hours
to walk the 1pps to UTC given the 3.8e-5 adjustment
range via the RS232 input. A thunderbolt, an arduino,
and patience.
On 01/11/2012 09:50 AM, Chris Albertson wrote:
On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp<[email protected]> wrote:
Hi
A good old logic probe can come in handy from time to time. They certainly
aren't very expensive.
On my FE5680 I was convinced there was no PPS. My HP5328 counter
could not find a pulse. All I saw was high frequency noise on the
scope. And the spec listed pin-6 as "N/C". Then I thought to amplify
and low pass filter and now the PPS shows up on the HP5328 with a
1000000.0 uS period.
I think the PPS is there but needs a bit a signal conditioning to be
useful. Fortunately my old Tek 465B scope has a low pass function and
a vertical amplifier output BNC on the rear. I had to crank the amp
up and attenuate it on the counter.
Has anyone been able to put the PPS fronmthe FE5680 to practical use
yet. For example sending it to a computer to drive an NTP server?
Detecting it is one thing. reliable use 24x7 is another thing.
Chris Albertson
Redondo Beach, California
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--
Chuck Forsberg WA7KGX N2469R [email protected] www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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