[time-nuts] Short term stabilites of some HP 5065A

corby d dawson cdelect at juno.com
Fri Sep 5 18:01:05 EDT 2008


There have been indications in the literature going back over 20 years
that some HP 5065A have VERY good short term stabilities, exceeding the
specifications by a large margin.

One of my aquaintances has tested all the newest rubidiums, including the
ones claiming superior short term stabilities. His application needs
superior short term stabilities between 1 and 100 seconds.

Selected 5065A units are the only ones that he has found that satisfy his
need!

So as well as evaluating the short term stabilities of a bunch of quartz
oscillators I have also tested a bunch of HP 5065A rubidium standards.

Here is the data showing the short term stabilites from 1 to 1K seconds
of thirteen different 5065A units.

Rb9, Rb2, Rb12, TVB1, and TVB2 values were from data measured elsewhere.

For comparison the specifications for the 5065A are included on the top
line.

As you can see they all handily beat the specs. (Rb9 at 1 sec is a tiny
bit high but not remarkably so.)



5065A 1 SEC. 10 SEC. 100 SEC. 1K SEC.
------------------------------------------------
Spec.   <5.0-12 <1.6-12 <5.0-13 <5.0-13

940-      3.51-12 1.02-12 2.43-13 1.00-13 
2432A   1.40-12 6.06-13 3.31-13 3.28-14
2340A   1.66-12 7.09-13 2.93-13 6.54-14
2640A   1.16-12 4.06-13 1.23-13 2.10-14
2816A1 1.04-12 3.89-13 2.40-13 3.37-14
TESTER 1.15-12 7.40-13 3.66-13 7.54-14 
RB09     5.50-12 1.00-12 3.00-13 3.00-13
RB02     9.00-13 3.00-13 1.00-13 6.00-14
RB12     2.00-12 4.00-13 1.10-13 5.10-14
TVB2     1.17-12 4.80-13 1.50-13 7.80-14
TVB1     1.13-12 3.32-13 1.13-13 5.10-14
2816A2  2.62-12 1.09-12 4.12-13 1.10-13
2816A3  1.38-12 5.93-13 2.51-13 7.81-14

FTS
1200#2   2.99-13 4.30-13 7.69-13 8.65-13

One of my current projects is to install an FTS1200 oscillator , data on
bottom line, into the 5065A prefix 2340A unit.

With some tweaking of the time constants I hope to get the 1200 stability
to a little past 10 seconds and then pick up the rubidiums stability for
the longer taus.

This would give me a local standard with <5X10-13th stability from 1 sec
to >1000 seconds! 

Here are the preliminary results using a bigger integration capacitor. 

I hope to reduce the "bump" at 10 seconds to less than 5.0X10-13th. I'm
going to try a different method.

HERE ARE THE RESULTS OF THE FTS 1200 INSTALLED IN THE 5065A 

X Allan Deviation
1 5.03431003598505E-13
2 5.91219014265936E-13
4 7.32924010274353E-13
8 8.36306500506541E-13
16 8.03386131043816E-13
32 7.17246367578202E-13
64 5.62909296753953E-13
128 3.98222917349906E-13
256 3.01424909230413E-13
512 1.94531160606847E-13
1024 1.54934821774033E-13
2048 1.99151147040887E-13
4096 8.01483740850486E-14


X Allan Deviation
1 5.03431003598505E-13
10 8.34471571168723E-13
100 4.60185955919969E-13
1000 1.49306028392312E-13

Corby Dawson
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