85
plates as standard inputs and applied to the stationary mode of
restitution.
The laboratory tests, on the contrary, are detective differential tests,
making use of auxiliary measuring or reference devices (or standard
inputs), and applied either to the stationary or the dynamic mode
of restitution.
4. Conducting of tests
The conducting of tests concerns the following main phases:
fig. 6
a) specification of objectives,
b) specification of environments,
c) specification of the means for execution,
d) definition of the testing process,
e) choice of the method for data processing,
f) estimation of the power of a test,
g) optimisation.
The conducting of tests may be regarded as an iterative feedback
procedure. This applies particularly in the case of the detective
tests. Let us deal now in more detail with the individual phases in
the procedure of conducting a test.
4.1. Objectives
The objectives normally correspond with those considered at the
stage of the system design. They are defined by the stage, purpose,
type and the mode of restitution. If the instrument is going to be
used for a new application, not foreseen during the design stage,
new objectives may come into the picture.
pl ENVIRONMENTS 1
DEFINITION OF
TFSTING PROCESS
initial
A PURPOSE
A means"
specifications
TEST
output
TYPE
feedback
DATA
PROCESSING
performance
EVALUATION
level
desired
level
(mathematical-"!
MODELr
—I CRITERIA I
