UL1977温升测试标准

UL1977是用于数据、信号、控制和电力应用中使用的连接器UL认证标准，连接器UL1977认证需要进行温升测试。UL1977温升测试是测试连接器在通zui大额定电流情况下部件的温度变化情况，以确定连接器工作时可被接触到的部分，是否存在温度过高造成人身伤害的风险。

UL1977温升测试产品数量

6个新样品 

UL1977温升测试方法

- The temperature measurement is to be made on the wiring terminalsof each device

   温升测试点应布在接线端子上

- The test is to continue for 4 hours even if stabilizedtemperatures are attained in a shorter period of time

  zui少连续运行4个小时，温度在很短的时间内稳定

- Three consecutive readings, taken at 5 minute intervals indicateno further rise above the ambient temperature

   三次连续读数，每次间隔5分钟

- All contacts are to be connected in series so as to carry thesame test current.

   所有的端子需要串成一个回路来通相同的电流

- Tested at a draft-free area having an ambient temperature of 25±5°C (77 ±9°F)

   测试的环境温度应保持在25 ±5°C (77 ±9°F)

UL1977温升测试判定标准

- The measured temperature shall not exceed the Relative ThermalIndex (electrical) of the insulating material

  UL：zui高温度不能超过塑料的RTI (Elec.)值

   UL+CUL：温升不能超过30K。