[time-nuts] FE-5680A arrived

[Randy D. Hunt]

On 1/11/2012 12:22 PM, Tom Holmes wrote:
> You might also consider adding the TAPR Fat PPS to stretch the pulse. See
> TAPR.org.
>
> Tom Holmes, N8ZM
> Tipp City, OH
> EM79
>
>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of David
>> Sent: Wednesday, January 11, 2012 10:17 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] FE-5680A arrived
>>
>> On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither<smither at c-c-i.com>
>> wrote:
>>
>>> Joseph Gray wrote:
>>>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>>>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>>>> 340 scope.
>>> I can see the 1 usec, 1pps on mine, but only if I use an analog storage
> scope.
>>> Although my HP54000 series scope triggers at 1PPS, for the life of me I
>>> cannot get it to display the 1 usec pulse :-(.
>> You might need to darken the oscilloscope environment or use a viewing
> hood.
>> Some analog non-storage oscilloscopes, either because of design or age,
> are not
>> going to be able to display a short pulse at 1 second intervals.  I tested
> this on my
>> old but in good condition 2230 and it could display it dimly in normal
> room light but
>> my older worn 7603 can not.
>>
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>
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Or you might take a look at Don Lancaster's TTL Cookbook.  All kind of 
pulse stretchers in there.

Randy