Civil Engineering Reference
In-Depth Information
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Fig. 6.4
Generic test-system architecture according to ISO 9646
data results in the test verdict in the TCP. All data are stored for the purpose of later
evidence of correct test execution. There are some test-system implementations in
which the UT operates within the system under test (SUT) virtually as an embedded
system (see Fig.
6.4
).
In addition to the generic tester architecture ISO 9646 specifies various condi-
tions and requirements for conformance tests and the corresponding specification.
These criteria are of major importance for the quality and significance of confor-
mance tests. Some of the most important ones are listed below and their meaning
is explained:
• The test description language must be human readable and preferably computer
executable. For instance,
Test and Test Control Notation
(TTCN) is such a re-
commended language for which there are compilers and interpreters which allow
execution of test descriptions on computers. The representation is abstract; it is
not real time executable. When applying current
Personal-Computer
-technologies
(PC-technologies) specific operating systems, a time resolution in the range of
some milliseconds can be achieved, unfortunately, quite often, with a large jitter.
Alternatively, human-readable script languages are applied for configuring real
time capable measurement devices. Resolution and accuracy of this methodolo-
gy only are limited by the characteristics of the applied measurement devices.
As such, high-precision data acquisition and corresponding analysis of timely
behaviour of the test object are feasible.
• The test specification shall be independent from the test object and the applied
specific test-system implementation. The test methodology shall be defined in
an abstract way. The test methodology describes, among others, which interfaces
of the test object must be served and whether there is a single test object only or
