Which method can reduce the frequency of on-line proof testing?

• A. More automatic internal diagnostics designed in
• B. Specifying shorter test intervals
• C. Cutting the number of tests done at each test interval
• D. Adding more test personnel to the test team

Answer: (A)

The correct answer focuses on the implementation of more automatic internal diagnostics in the system design. By enhancing the capabilities of automatic internal diagnostics, the overall reliability and performance of a system can be improved. These diagnostics can continually monitor the health and status of the system components, allowing for real-time identification of potential failures or issues without requiring frequent manual testing. As a result, the need for on-line proof testing can be significantly reduced, as the diagnostics provide ongoing assurance that the safety functions are operational.

In contrast, specifying shorter test intervals would likely increase the frequency of testing rather than reduce it, while cutting the number of tests at each interval may compromise the thoroughness of the safety verification. Lastly, adding more test personnel might help manage testing resources but does not inherently reduce the frequency of proof testing itself, which is the primary concern of the question.