On 30/12/12 02:46, [email protected] wrote:
Also about ensembles,
http://www.mksa.deit.univpm.it/biblioteca/sala_tecnica/scaffale_strumenti
/Campioni/EPSG070861.pdf
This article describes combining 4 HP 5071A standards.
Description on page 2 and block diagram in figure 2.
Unfortunately no details on the controller are given!
It's what I'd like to do to two or more HP 5065A
Anyone know what they did in the controller?
I'd assume that this is similar to what is described in Chapter 9 of NBS
Monograph 140, by Dr. David Allan and friends:
http://tf.boulder.nist.gov/general/pdf/194.pdf
When reading the FORTRAN code, one has to realize that the ER
calculations is hard-wired to the way that the NBS setup at the time
where done, so that the 8 clocks was compared by a number of pair-wise
measures and that the time-differences is combined as needed where some
of the clocks becomes transfer standards in the comparison back to the
primary reference standard. Clock 3 is the main clock in the hookup.
A modern view on things is found here:
http://tf.boulder.nist.gov/general/pdf/816.pdf
The original time-scale algorithm ran on a PDP-8 machine with 4k word
memory, coded in Fortran by Dr. Allan. Today they run using a pair of
redundant 386 machines and using a blend of Jim Greys buffer and mixers
and that of commercial time-interval measurement rig.
Cheers,
Magnus
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