On Wed, 23 Sep 1998, Oyvind Kaurstad wrote:

> >The accelerometer mice and the gyrostars are 2 different things. The
> >gyrostars have an offset and do not drift. Their gain changes somewhat
> >with temperature but a heli tail rotor gyro is not so sensitive to that.
>
> So, you're saying that at zero rotation the output is constant over the
> complete temperature range?

I can't swear, but I've never used, or seen, thermal compensation on
these. Of course the temperature range I mean here is indoor commercial
(+5 .. +40 deg C).  Beyond that, you're on your own.

I suppose that if it gets very cold then condensation can be a problem,
although the can is sealed almost hermetically.

The output of a gyrostar is inherently derived from a differential (i.e.
balanced)  quantity (although the O/P is not differential but referenced
to an external bias you supply) so any internal drift should cancel out.

> Does anyone have (or know where to find) a complete datasheet for the
> gyrostars?  I have checked the Murata website, but they only have a
> stripped HTML thingy.  Surely there must be a complete datasheet
> somewhere, preferrably in pdf-format.

I got what I was given and worked out the missing details using a test
circuit strapped to a pendulum ;) Actually, I think I've invented a way to
calibrate the thing completely without needing human involvement.

Peter