1. Safety grating working conditions: The temperature range of the measuring system working environment should be 0-45, and the relative humidity should not exceed 90%. The power frequency used in the measurement system should be 50Hz, with a rated voltage of 220V and a voltage fluctuation range of 85% to 110% of the rated voltage value.

2. Appearance and interaction of safety light curtain: The glass surface of the measurement system should not have bubbles, cracks, metal surfaces should not have defects such as rust, bruises, and coating detachment. Various signs and numbers should be correct and clear. Each fastening part should be firm and reliable, and each moving part should be flexible, stable, and free from any obstruction or looseness. The display of the effective range of the measurement system should comply with the specified value, and the display of the reference zero position should have normal functions such as clearing, setting, and direction identification.

3. Stability of the protection device of the punching machine: The stability of the measurement system within 4 hours under room temperature conditions should not exceed one pulse equivalent.

4. Reliability of photoelectric protection device: The measurement system reliability should be represented by the mean time between failures (MTBF), which should not be less than 3000h.

5. Safety: The leakage current between any terminal of the power socket and the casing should not exceed 3.5mA. The DC insulation resistance between any terminal of the power socket and the casing should not be less than 5M Ω. During the withstand voltage test, when the AC voltage is 1500V and the casing withstand voltage time is 1min, there should be no breakdown phenomenon.

6. Immunity: The measurement system should have electromagnetic compatibility capability. When disturbed, the change in indication should not exceed one pulse equivalent