On 5/11/2013 5:32 AM, Magnus Danielson wrote:
On 11/05/13 06:48, Jim Lux wrote:
On 5/10/13 6:52 PM, Ed Palmer wrote:
Part of me thinks it's cute, part of me wants to kill it. :-)
https://www.tindie.com/products/akafugu/vetinari-clock
Ed
but.. what is the actual distribution? Is it white phase or white
frequency?
Neither.
Instead of added wideband noise-modulation, think about more
systematic noise.
Notice how it only affects on every second. Also note how after
lagging it makes huge jumps. Also notice how it does not jump backwards.
What it tells is is that it makes a random decision wither to jump
forward or not, and if to jump forward one sec or the error sec.
Keeping the amount of time it lags, it can then every now and then
jump into place. It would make sense to have a maximum lag so that it
is forced to jump into place. There is a practical amount as to how
high speed you run the handle without there is a risc of it skipping
past the intended second without you noticing, so let say that it does
not do more errors than 5 seconds or so to keep it manageable.
The end result will be a clock which in long term is showing the right
time, but have short term variations. Since it is a lag scheme, it
will also on average be behind.
Not to hard to achieve with a PIC and not to hard to implement, but
highly annoying none the less.
Looking forward to seeing NIST having one of these in their lobby. :)
Of course, they'd reference it to a cesium fountain!
Ed
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