The accuracy of the MiniOx I as stated in the manual is +-1% of FULL
SCALE.  That means that since full scale is 100%, the readings you get
are within 1 percentage point of true values.  If you read 34% then the
actual can be from 33% to 35%.  That is typical in any piece of
instrumentation.  The accuracy is based on a percentage of the
instrument's full scale readings.

The 1% I state above is based on my recollection.  It may be 2% and you
can figure from that similarly that a 34% reading can be actually from
32% to 36%.

Andrew Drapp wrote:
> 
> On Fri, 14 Nov 1997, William M. Smithers wrote:
> 
> > You know, how many of you guys have actually read your MiniOx I manual?
> > +-2% is what the sensor is good for.  That's 4% total, which
> > is either pretty scary, or pretty indicative of the default conservatism
> > that's built into modern tables and deco algorithms.
> 
> Will,
> 
> With a +/-2% level of accuracy, the measured value will be within 2% of
> the value, not 4%.  Say you were measuring the F02 (OK, actually PP02) of
> a mix with 10% O2.  Exactly 10% O2.  The reading would be somewhere
> between 9.8% and 10.2% (+/-2% of the measured value.)  How presice do you
> need your FO2 measurements?

This is UNTRUE and unsafe to assume it!  As I said above, the accuracy
is based on full scale.  So 10% measured can be 8% to 12% if 2% is the
stated accuracy.

> andrew
> andrew@ce*.co*.jp*
> 
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-- 
Dave Mabry           dmabry@mi*.co*
Great Lakes Maritime Institute Underwater Research Team
NACD #2093            NSS-CDS #42872

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