[time-nuts] Why are 1PPS signals so skinny?

shalimr9 at gmail.com shalimr9 at gmail.com
Tue May 15 18:45:04 UTC 2012


The narrow pulses are easily filtered by the power supply because the frequency distribution of the power consumption has a much smaller component at 1Hz.

At 1Hz, the power supply filters nothing.

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: Mike S <mikes at flatsurface.com>
Sender: time-nuts-bounces at febo.com
Date: Mon, 14 May 2012 20:44:04 
To: <time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Why are 1PPS signals so skinny?

On 5/14/2012 8:21 PM, Tom Van Baak wrote:
> one day during an experiment where I was
> comparing a large set of clocks I noticed my lab's digital AC power
> meter was jumping by tens of watts every second.
>
> The last thing you want
> in a precision timing lab is to load your AC line down exactly once a
> second.

How does a short pulse help? It's still "tens of watts every second," 
but instead of lasting 0.5 seconds, it lasts 0.00005 seconds. Less power 
used overall, but still the same sudden change on the second.

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