Azelio,
as an example, with a 53131A you have an output 'granularity' of +/- 500
ps.
No matter how much averaging happens inside the counter, if the least
significant digit is 500 ps, then the (ADEV) measurement limit is always
5E-10 at 1 sec as I posted in the initial post to this thread. This is
not the accuracy of the counter, it's simply the available display and
output string resolution.
At 10 sec., the ADEV limit of the same counter is 5E-11 etc. etc.
finally getting limited by the reference source and other effects.
If the DUT's ADEV is in the 1E-13's, any measurement values below 1000
sec. are void and represent just the measurement limit of the +/- 500ps
counter.
Now I'm waiting to receive 'glasses' for my 53131A that are in transit :)
Adrian
Azelio Boriani schrieb:
Taking 10 samples from a 1nS counter leads you to a 100pS resolution but
the noise at best (if it is really random) is reduced by SQRT(10). So, as
already pointed out here, there is no real substitute for lower noise,
higher resolution measurements.
On Thu, Oct 4, 2012 at 3:01 AM, Bob Camp <li...@rtty.us> wrote:
Hi
A 1 ns resolution TI counter will do the measuring part just fine. Hitting
the number, is where it gets a bit crazy. A *good* GPSDO might get near
that.
Bob
On Oct 3, 2012, at 8:56 PM, Kevin Rosenberg <ke...@rosenberg.net> wrote:
On Oct 3, 2012, at 6:52 PM, Kevin Rosenberg <ke...@rosenberg.net> wrote:
Nice plot! Yes, I'd have trouble measuring 10E-14 at 10E5 seconds.
Sorry, 1E-14 at 1E5.
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