It would be a simple experiment. All you need is a known good square
wave oscillator that can produce a stable signal at RS232 voltage
levels.
Linus PPS comes with a test tool that will print the events like this
found PPS source /dev/pps0
ok, found 1 source(s), now start fetching data...
source 0 - assert 1186592699.388832443, sequence: 364 - clear
0.0, sequence: 0
source 0 - assert 1186592700.388931295, sequence: 365 - clear
0.0, sequence: 0
source 0 - assert 1186592701.389032765, sequence: 366 - clear
0.0, sequence: 0
The above test shows time of each event and the sequence number.
One would have to import this to a spread sheet or write software but
not hard core programming required
On Wed, Jun 29, 2011 at 12:19 PM, Scott Newell new...@cei.net wrote:
At 02:14 PM 6/29/2011, Tom Van Baak wrote:
Out of curiosity, if anyone on the list has pointer to papers that
show actual measurements of desktop systems used as precise
timing devices let me know. Not external boxes or PCI cards, but
using the OS itself as a timer. I'm sure with care 1 us or even
100 ns is possible. For example, how accurate is the best NTP
system? But this is still a thousand times more jitter than plain
logic circuits and a million times worse than specialized TIC's.
Reply off-line, I know this is getting very off-topic.
Please don't take that off-line! I'd say this is pretty on-topic for
time-nuts. Maybe it just needs a different subject line.
--
newell N5TNL
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--
Chris Albertson
Redondo Beach, California
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