If the ballast is to be tested mounted in a metal luminaire the luminaire enclosure is to serve as the common potential point for the test probe (see Figure 10.8).
If the ballast is to be tested mounted in a metal luminaire the luminaire enclosure is to serve as the common potential point for the test probe (see Figure 10.8).
将是和发光元件连接，组成一个回路以便构成一个正常的电位方便使用测量针测试。