Forum sponsored by:

Call me cynical / Call me thick ... but

Search for: in Thread Title in

Howi	07/04/2021 09:11:55
442 forum posts 19 photos	Posted by Robert Atkinson 2 on 06/04/2021 12:50:04: In my home workshop I can measure time to 20 picoseconds for one off events, much better for something that can be averaged. Thats 2x10^-11 or 0.00000000002 s. Thats good enough for most practical purposes. Light travels about 6mm in 20 ps.I can measure frequency to over to 25 GHz (2.5s10^10). I have 4 atomic frequency standards, but like most time nuts I mostly use GPS based clock. I have several of those with 3 different models running 24/7. You need three because if you only have two and they are different you don't know which is right I built a precsion quartz oscillator at over the weekend. I can easily see the effect of gravity on this e.g. the frequency change when you turn it on its side, +1 G to 0 G Robert G8RPI. Someone has far too much time on his hands me thinks............ on second thoughts......... but then how do I measure that? time I was going.......... OMG I have just wasted two minutes of my life Aarrgh! panic.
Martin Kyte	07/04/2021 14:18:19
3445 forum posts 62 photos	Even assuming the absolute stability of the atomic oscillator the second is defined as a fixed number of transitions and using this as a reference imposes a limit on the subdivisions or granularity of any time measurement. One cannot subdivide time into smaller units than the oscillator period. A faster oscillator allows better time resolution which is what I think the article is getting at. regards Martin

<< First < Prev 1 2

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts

hemingway ball turner
04/07/2025 14:40:26
*Oct 2023: FORUM MIGRATION TIMELINE*
05/10/2023 07:57:11
Making ER11 collet chuck
05/10/2023 07:56:24
What did you do today? 2023
05/10/2023 07:25:01
Orrery
05/10/2023 06:00:41
Wera hand-tools
05/10/2023 05:47:07
New member
05/10/2023 04:40:11
Problems with external pot on at1 vfd
05/10/2023 00:06:32
Drain plug
04/10/2023 23:36:17
digi phase converter for 10 machines.....
04/10/2023 23:13:48
More Latest Posts...
View All Topics

Support Our Partners

Shopping Partners

Subscription Offer

Latest "For Sale" Ads

Reeves** - Rebuilt Royal Scot by Martin Evans
by John Broughton
£300.00
BRITANNIA 5" GAUGE James Perrier
by Jon Seabright 1
£2,500.00
Drill Grinder - for restoration
by Nigel Graham 2
£0.00
WARCO WM18 MILLING MACHINE
by Alex Chudley
£1,200.00
MYFORD SUPER 7 LATHE
by Alex Chudley
£2,000.00
More "For Sale" Ads...

Latest "Wanted" Ads

D1-3 backplate
by Michael Horley
Price Not Specified
fixed steady for a Colchester bantam mark1 800
by George Jervis
Price Not Specified
lbsc pansy
by JACK SIDEBOTHAM
Price Not Specified
Pratt Burnerd multifit chuck key.
by Tim Riome
Price Not Specified
BANDSAW BLADE WELDER
by HUGH
Price Not Specified
More "Wanted" Ads...

Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues