USB375x

DS00001824A-page 24

 2011 - 2014 Microchip Technology Inc.

5.2.2.1

Air Discharge

To perform this test, a charged electrode is moved close to the system being tested until a spark is generated. This test

is difficult to reproduce because the discharge is influenced by such factors as humidity, the speed of approach of the

electrode, and construction of the test equipment.

5.2.2.2

Contact Discharge

The uncharged electrode first contacts the USB connector to prepare this test, and then the probe tip is energized. This

yields more repeatable results, and is the preferred test method. The independent test laboratories contracted by Micro-

chip provide test results for both types of discharge methods.