RE: [Maybe spam] Common schema units of measure - Use Option 2 plus

[Stephen.Osella@xxxxxx]

Does the schema allow a unit for "Parts Per Million" i.e., PPM ?

Stephen Osella


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             <Chris.Gorringe@r                                             
             acalinstrumentsgr                                             
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             atml@ieee.org                                                 
                                                                   Subject 
                                       RE: [Maybe spam] Common schema      
             12/15/2005 04:07          units of measure - Use Option 2     
             AM                        plus                                
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Units should always be units (defined in some standards somewhere) and
therefore we need to maintain a list of supported units

We can add (either at the base class or by deriving types) historic units
Ins, ft, lbs, jerk etc. but these should ALWAYS be unit values references
to some standard
The modification or qualifier discussed I see needs to be available and
should include the following (taken from IEEE 1641-2004)

trms (true root means square)
pk_pk (Peak to Peak)
pk (Peak)
pk_pos (Positive peak same as peak)
pk_neg (Negative peak)
av (average)
inst (instantaneous)
inst_max (instantaneous maximum value)inst_min (instantaneous minimim
value)


Note Peak values pk_pos, peak_neg, are w.r.t. the average value and are not
absolute values, i.e. a peak of pure sinwave is its amplitude removing and
DC-offset


The need for a free text 'modifier' is therefore to hold information which
is neither the 'Unit' or the 'quallifier' information examples of which I
would welcolme
Regards
Chris




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