[time-nuts] Question concerning failure and value of HP 5371A

Arnold Tibus Arnold.Tibus at gmx.de
Sun Oct 16 15:09:15 EDT 2005

Hi Tom, 
I am very much interested on your works and results, it sounds to 
be a interesting way, nice project. Unfortunately I do understand 
nothing of these new devices.
I would like to keep in touch with you, thank you.

about the rule of thumbs:
8 is quite a good number.
It depends how precise one want to reflect the original shape,
I used the similar rule quite close, the number of 10, knowing that 
this will already reduce the rise time a bit. For best results demonstrating 
measurement I used sometimes the factor of 20 at lower data rates, 
which of course ends up at higher rates far in the microwave range - 
with all the involved problems. For critical tasks I had a very nice 
4 chanel scope with a total bw of 3 GHz available. 
But a lot of times it can even sufficient to work with the factor of 5, 
accepting the shape modification but with the advantage having less 
EMC problems.


Arnold, DK2WT

On Sun, 16 Oct 2005 19:52:47 +0200, Poul-Henning Kamp wrote:

>In message < at pop.fast.net>, buehl writes:

>>Even at the 200 MHz rate, the very high 
>>transition time of the input pulses required that the circuit be "clean" at 
>>1 GHz.

>It used to be a rule of thumb that analog circuits should have 8
>times the bandwidth of any squarewave to be handled such that the
>3rd, 5th and 7th overtones were intact.

>Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>phk at FreeBSD.ORG         | TCP/IP since RFC 956
>FreeBSD committer       | BSD since 4.3-tahoe    
>Never attribute to malice what can adequately be explained by incompetence.

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