3
• Safety Auto Shut-Off Indicator to prevent overheating
The fixture is capable of drawing from a range of about 300mA to 1.8A from a 5V source. Because the
heat dissipated when drawing such a large load is relatively high the fixture will automatically turn off after
30 seconds; in this situation the Safety Auto Shut-Off Indicator light will glow. To reset the fixture simply
detach from the USB port and reattach.
Figure 1: USB Over-Current Test Fixture
Measurement
Jacks
Safety Auto
Shut-Off
Indicator
Current
Control Knob
USB Plug
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