Error trapping, widely known in modern programming as error handling or exception handling, is the practice of anticipating, detecting, and resolving exceptional conditions that occur during program execution. Instead of allowing an unexpected error to cause a sudden crash, error trapping enables the software to respond gracefully and maintain system stability.
In the context of controlling programmable power supplies, errors can arise from various sources, such as invalid command parameters (e.g., setting a voltage outside the rated range), communication timeouts, disconnected cables, or internal hardware faults. A robust control program implements error traps to manage these scenarios effectively.
This is typically achieved using try...catch or try...except structures. The primary control logic runs within the try block. If an exception occurs, execution immediately transfers to the corresponding handler block. This handler can then log the error, alert the operator, or safely shut down the power supply output to protect the device under test.
Effective error handling is essential for automated test systems, ensuring high reliability and safety by preventing undefined behavior during operation.