Ascertain the specific object of the test, and keep this in view not
only in the work of preparation, but also during the progress of the
test, and do not let it be obscured by devoting too close attention to
matters of minor importance. Whatever the object of the test may be,
accuracy and reliability must underlie the work from beginning to end.
If questions of fulfillment of contract are involved, there should be a
clear understanding between all the parties, preferably in writing, as
to the operating conditions which should obtain during the trial, and as
to the methods of testing to be followed, unless these are already
expressed in the contract itself.
Among the many objects of performance tests, the following may be noted:
Determination of capacity and efficiency, and how these compare
with standard or guaranteed results.
Comparison of different conditions or methods of operation.
Determination of the cause of either inferior or superior
results.
Comparison of different kinds of fuel.
Determination of the effect of changes of design or proportion
upon capacity or efficiency, etc.