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

Arnold Tibus Arnold.Tibus at gmx.de
Sun Oct 16 14:03:32 EDT 2005

Hello Magnus,
I think we are not anymore in line with the subject line, but this device I want to 
build is to replace the not existing interval counter for some measurement 
tasks I want to solve.

On Sun, 16 Oct 2005 02:24:32 +0200 (CEST), Magnus Danielson wrote:

>From: "Arnold Tibus" <Arnold.Tibus at gmx.de>
>Subject: Re: [time-nuts] Question concerning failure and value of HP 5371A
>Date: Sun, 16 Oct 2005 01:36:51 +0200
>Message-ID: <E1EQvbQ-0005o2-J8 at febo.com>

>Hi Arnold,
>Are you aquanted with the term analog interpolators? Basically they try to
>measure the time-difference between the counting-clock edges and the start/stop
>trigger edge.

>However, I have yeat to understand what you are really after. There is many
>ways to skin a cat, but maybe if I knew what type of cat you are looking to
>skin I might give some more ideas on what to do...

Magnus, it is easy to tell what I want (but propably hard to realize):
I want to count, as precise as possible, a gated pulse train. The number of 
the pulses will be the measure for the width of the gate and its variations, 
which is opened and closed by separate start / stop signal edges. 
Obviously, the shorter the pulses the better the resolution, the more precise 
will be the absolute value. 
This circuit I want to use shall be useful to determine the time difference 
between two signal edges and to determine a possible drift and jitter between 
both signals. The generation of the necessary pulses with 100 MHz to 
500 MHz seem not to be that problem, I got good ideas from existing commercial 
circuit. But for the gate and the counter I have not found stardard circuits or ICs. 
The problem are the very short rise and fall times and high repetition/ clock rates. 



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