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USB USB-IF, Руководство по эксплуатации

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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 

Содержание USB-IF

Страница 1: ...Operations Manual USB IF Over Current Test Fixture USB Over Current Test Fixture January 14 2013 Revision 1 0 ...

Страница 2: ...should come with the following Qty 1 Over Current Test Fixture Please examine package contents upon receiving your fixture kit for these items Required Test Equipment Ammeter Voltmeter Load fixtures used for USB voltage drop testing Host or Hub to be tested ...

Страница 3: ...tion must not be triggered on any port sourcing less than the minimum required current defined for that port Above the minimum current limitations the over current trigger level is vendor specific The USB IF encourages all vendors to set the over current limitation with purposes of safety in mind If a downstream port can safely source the current it should do so even if the current exceeds USB spe...

Страница 4: ...ipated 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 ...

Страница 5: ...ting 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...

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