Isolation

T 500V >100M .15T .2S

An isolation test is a direct current (DC) or alternating current (AC) resistance test that is performed on sub-systems of an electronic system to verify that a specified level of isolation resistance is met. Isolation testing may also be conducted between one or more electrical circuits of the same subsystem. The test often reveals problems that occurred during assembly, such as defective components, improper component placement, and insulator defects that may cause inadvertent shorting or grounding to chassis, in turn, compromising electrical circuit quality and product safety.

The tag letter “T” is a standard use for an all-points isolation test. This parameter is often the same as the insulation parameter.

Source: NETS User Manual, Revision D, document 132-06035-0006, section 4.4.5.