How is the electrical-zero test performed on the CSE 102 detector?

The electrical-zero test on the CSE 102 detector is performed by pressing the test button only. This procedure is vital for ensuring the accuracy and reliability of the detector's readings. When the test button is activated, it allows the device to establish a baseline or zero reference point, effectively calibrating the system and ensuring that any readings that follow are accurate.

This is particularly important in environments like mining, where the ability to detect harmful gases is critical for safety. The test ensures that any potential discrepancies in the readings caused by environmental factors or equipment malfunctions are minimized. Knowing that the detector starts from a zero baseline reinforces confidence in its operation and functionality.

The other options involve actions that either do not pertain to the zeroing process, like pressing both buttons, or are not aligned with the standard operating procedures recommended for the CSE 102 detector, such as merely turning off the device or pressing the reset button only. These actions do not achieve the same calibration effect provided by the dedicated functionality of the test button.