>> 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


I actually spoke with him again today, and no good news... he said he wrote 
the paper 8 years ago and he doesn't remember anything about the gyro.

>
> 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.

Seems more complicated than I wanted it to be, but that's a good hint, I'll 
try that.


>        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
I know, I've downloaded that paper already. :-)


Cheers

Padu 

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