4
OPERATION
Select a downstream port to test. Load adjacent downstream ports with the voltage drop fixtures. The
cumulative load should not exceed 5A. Attach the Over-current test fixture to the downstream port to test.
Figure 2 provides a standard topology for testing an over-current condition. Turning the Current Control
Knob clockwise will increase current draw and counter-clockwise will decrease current draw. If the Safety
Auto Shut-Off Indicator illuminates during use simply detach and reattach the fixture to start drawing
current again.
Figure 2: Standard Topology
Note: Be sure the digital Ammeter probes are placed in the current measurement jacks and that the
Ammeter is set to measure current.
USB Host or Hub
Ammeter
