how to measure current in usb

[gobinklind]

How to measure current in my laptop usb port... if it is 600m amps i want to limit it 5v,500m amps ,which device is used to limit the current.

 

[ganesh dvk]

use usb to serial converter then next use max232 ic to interface the controller to usb...

 

[shamikrudra]

Normally USB port provide 100mA current and it can provide 500 mA if configured to do so not 600 mA

 

[kam1787]

you could use a current clamp but normally they are used for much higher currents

otherwise you have to 'insert' the VOM or DVM into the line.

Shamik Rudra is right - the specs do not provide for high current supply BUT some boards will allow. No easy way to limit current without incurring a voltage drop.

Why do you need to limit current? What is the load?