Thank you all for interesting information to read !
After few experiments I made a conclusion it is very subjective measure.
Its like how are you "feeling" it. Say if I "feel" that my clock is
"good" - I see that my clock is almost in sync. with "master clock". The
other day if I "feel" that my clock is far from perfect, I see the big
gap. ;-))))
The best approach, I think, is using camera and slow motion. Then you
could "rewind it" and see how it is.
Here is the link to the YOUTUBE: https://youtu.be/GScyoA8gCzY
Regards,
V.P.
On , Tom Van Baak wrote:
That would make a fun time experiment. One that you should do and
report back to us.
I see two experiments: one using LED flashes and one using speaker
ticks.
In each case output a main and a delayed pulse. Try it yourself, and
with a number of friends.
The goal is to find at what level people can discern the difference
between, or the order of, two events.
From the data you can determine both a human average and an average
human response.
Use identical LEDs, and identical speakers.
Also, use a common timing source. Do not compare CHU with NTP with PC
monitor with PC speakers; all that does is introduce layers of unknown
offsets into your experiment. This is would be an easy Arduino /
Raspberry-Pi sort of project.
For higher precision, see pd26.asm and pd27.asm (
http://leapsecond.com/pic/src/ ) as an example of precise pulse
stepping.
If this turns out to give reliable data, you can then try different
color LEDs and different frequency speaker ticks to see what effect
that might have on resolution. Also try different pulse durations to
see if human leading edge detection is affected by pulse width.
For those of you with a Stanford Research DG535 and two spare LEDs,
give it a try right now.
http://www.thinksrs.com/products/DG535.htm
/tvb
----- Original Message -----
From: "d0ct0r" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Friday, April 17, 2015 11:16 AM
Subject: [time-nuts] Visual clock comparison
Hello, Netizens !
I am wandering what is the average human ability to visually compare
two
clocks ? Let say I have XClock application running on one machine
(stratum 1 NTP) and I have my project clock close by. And I would like
to match the reading. If I'll see the difference, which range it will
be
? 100ms or so ?
I also tried to use my ears (CHU radio signals and clock display, NRC
phone line). However NRC "Talking Clock" could be routed via Satelite
which will compromise the "reading" a little bit. Thanks !
--
WBW,
V.P.
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--
WBW,
V.P.
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