> A couple months ago I bought a 3-axial gyro from ebay. I've looked 
> everywhere for its datasheet and couldn't find any information. It 
> is (was) manufactured by Northrop Corporation (see info below).
>
>
> NORTHROP CORPORATION
> Precision Product Division
> FSC 51834
> Mfr. P/N: 50162-317
> 3 AXIS DC/DC GYRO PKG.
> P/N 50162-317
> SER.NO 104
> WT. 1,8 LB


I was about to be smart and recommend Stephen Bruder or Brian Pletta * 
, but I ssee that you've already spoken to Stephen

        http://www.electro-tech-online.com/datasheet-parts-requests/21198-3-axis-dc-dc-gyro.html

It's a 3D rate gyro with analog outouts (you know that).
The output *phase* may vary with motion. If so, looking at one channel 
at a time on an oscilloscope may not appear to give any change. Try 
using two channels in X-Y mode on a scope so you get a "Lissajus 
figure" - should be a circle when at rest if all channels use equal 
output frequency, as they probably do. if the phase is varying the 
figure will change shape with motion.

You could also try a phase lock loop locket to a channel signal and 
monitor the loops error/control voltage which should change to hold 
phase lock as input signla phase changes.



        Russell McMahon


* Google is your friend :-)

 http://66.102.7.104/search?q=cache:TiKn6Bi3DzQJ:isrg.nmt.edu/~ms/publications/f/SNL_report_98.pdf+FSC+51834+rate+gyro&hl=en&gl=nz&ct=clnk&cd=2 

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