Technical data

Low and Full Speed Tests 7
Notes on USB Electrical Compliance Testing 179
There are several switches/buttons that are used for general control of the
test fixture. These include (see picture below):
• Switch S5 allows you to select either the Droop or Drop test.
• Switch S4 allows you to select either the 100 mA or 500 mA load.
• Press and hold S1 for at least three seconds to turn the test fixture on.
• While pressing and holding S2, press S1 to turn the test fixture off.
You are now ready to begin the Drop or Droop tests. Continue to read this
chapter for specific instructions on performing each of these tests.
USB Power
DS1
S1
S2
S4 Load option
S5 Drop and droop
option