[time-nuts] Fury - Rubidium
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed Jul 28 01:48:09 UTC 2010
Hi Brian,
based on your measurements, it seems that your unit has a swing of about
0.00566 Hertz per Volt EFC, which is very little.
This compares to about 8Hz per volt for the standard DOCXO's we use.
That's a 1413 to 1 difference in EFC sensitivity between the Rb and the
standard OCXO.
We use a dacgain of 15 for the standard OCXO, so try 15 * 1400 = 21,000 for
the Dacgain (that's a lot of dacgain!)
We use 0.7 for EFCS, and 15 for PHASECO, and 40 to 80 for EFC Damping.
Unfortunately we do not have the Rb's here in house that you are using to
try this out.
Let me know if that works,
bye,
Said
In a message dated 7/27/2010 17:46:42 Pacific Daylight Time,
kilodelta4foxmike at gmail.com writes:
I did another test and the rubidium dial setting was 000 for a control
voltage of 0.068V and the average frequency was 9 999 999.9933 hertz.
The dial setting was changed to 721 for a control voltage of 4.9999V and
the average frequency was 10 000 000.0216 hertz
The measurements were taken with a HP5370B time interval counter
referenced to a HP5065A rubidium oscillator. The data was recorded
using a ProLogix GPIB adapter. The data was recorded in 10 minute
intervals with the data coming in at one measurement a second. When the
frequency was changed, I allowed 20 minutes between the recordings.
Based on the above measurements, Said, can you recommend some starting
point for the DAC Gain, EFC Scale, and the EFC Damping ?
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